Mercurial > repos > blastem
annotate notes/cdd_mcu_notes.txt @ 2295:eb45ad9d8a3f
WIP "video" recording in APNG format
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Fri, 10 Feb 2023 23:17:43 -0800 |
| parents | f1c2415f4d1d |
| children |
| rev | line source |
|---|---|
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2060
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1 CD Block Clock: 16.9344 MHz |
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2 MCU Clock divider: 2.1168 MHz (cd clock / 8) |
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3 |
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4 State at Reset: |
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5 Status buffer is filled with zero |
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6 Mechanism is reset |
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7 Emulation state set to ES_CLOSING |
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8 |
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9 HSCK active low |
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10 IRQ active high |
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11 CDCK active high |
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12 |
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13 Main Loop: |
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14 wait for subcode data for next frame |
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15 seems to be delivered via a "bank" IRQ |
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16 if servo is not in PLAY state |
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17 set DOUT and EMP to inactive |
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18 set MUTE to active |
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19 elif Q subcode CRC is not valid |
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20 set MUTE to active |
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21 elif Q subcode CONTROL field indicates a DATA track |
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22 set DOUT and MUTE to active |
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23 set EMP to inactive |
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24 else |
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25 set DOUT and MUTE to inactive |
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26 set EMP based on emphasis bit in Q subcode CONTROL field |
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27 run drive emulation state machine |
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28 if we received a valid command last loop |
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29 populate status buffer based on request format (see table below) |
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30 if drive error status is valid |
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31 override status format (2nd nibble) to RF_NOTREADY |
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32 put error status in STATUS (1st nibble) of status buffer |
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33 set error status valid to false |
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34 else |
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35 put drive status in STATUS (1st nibble) of status buffer |
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36 Communication with Host via gate array: |
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37 goes to fail state if HSCK is active (i.e. low) |
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38 IRQ line is asserted |
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39 Waits ~2ms (4234 cycles) for HSCK to go active (i.e lo) |
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40 on timeout, resets outputs to host to inactive and quits comms this loop |
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41 deasserts irq |
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42 Sends 10 status nibbles |
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43 nibbles are inverted |
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44 HSCK is handshake from host |
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45 CDCK is handshake frm MCU |
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46 minimum 77 cycles per nibble |
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47 |
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48 HSCK 1 (inactive) -> 0 (active) |
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49 nibble output |
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50 CDCK 0 (inactive) ->1 (active) |
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51 HSCK 0->1 |
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52 CDCK 1->0 |
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53 sets status sent flag |
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54 Gets 10 command nibbles |
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55 HSCK 1->0 |
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56 nibble input |
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57 CDCK 0->1 |
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58 HSCK 0->1 |
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59 CDCK 1->0 |
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60 Entire status/command transfer has timeout of ~3ms (6351 cycles) |
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61 on timeout, resets outputs to host to inactive and quits comms this loop |
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62 sets command received flag |
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63 Checksum of command is checked |
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64 if bad, resets outputs to host to inactive and quits comms this loop |
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65 set command valid flag |
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66 resets outputs to host to inactive |
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67 Runs command from host |
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68 Generally comms failures cause it to just run a Nop command |
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69 checksum failures cause drive error status to be set to STATUS_SUMERROR |
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70 command is specified by first 2 nibbles of command packet |
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71 second nibble must be zero or command is invalid |
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72 first nibble must be < 0xE and != 0x5 or command is invalid |
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73 command is sent to PC |
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74 command implementation is run |
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75 |
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76 |
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77 format Absolute |
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78 if Q subcode CRC is bad OR Q subcode Control ADR mode is not 1 or Q subcode tracknum indicates leadin |
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79 set status format (2nd nibble) to RF_NOTREADY |
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80 else |
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81 store Absolute (RF_A == 0) in status format (2nd nibble) |
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82 copy ATIME in BCD format from Q subcode buffer to 3rd through 8th nibble (inclusive) |
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83 store flags in 9th nibble |
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84 these seem to correspond to the data, emphasis and mute control bits sent to CD hardware |
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85 format Relative |
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86 if Q subcode CRC is bad OR Q subcode Control ADR mode is not 1 or Q subcode tracknum indicates leadin |
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87 set status format (2nd nibble) to RF_NOTREADY |
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88 else |
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89 store Relative (RF_R == 1) in status format (2nd nibble) |
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90 copy relative track TIME in BCD format from Q subcode buffer to 3rd through 8th nibble (inclusive) |
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91 store flags in 9th nibble |
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92 these seem to correspond to the data, emphasis and mute control bits sent to CD hardware |
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93 format Track |
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94 if Q subcode CRC is bad OR Q subcode Control ADR mode is not 1 or Q subcode tracknum indicates leadin |
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95 set status format (2nd nibble) to RF_NOTREADY |
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96 else |
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97 store Track (RF_T == 2) in status format (2nd nibble) |
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98 copy track number to 3rd and 4th status buffer nibbles |
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99 copy Q subcode CONTROL field to 5th status buffer nibble |
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100 copy Q subcode ADR field to 6th status buffer nibble |
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101 store flags in 9th nibble |
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102 these seem to correspond to the data, emphasis and mute control bits sent to CD hardware |
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103 format TOCO |
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104 if disc is not validated |
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105 set status format (2nd nibble) to RF_NOTREADY |
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106 else |
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107 set status format (2nd nibble) to RF_TOCO(3) |
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108 copy leadout start in MM:SS:FF format (BCD) to 3rd through 8th nibble (inclusive) |
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
109 store flags in 9th nibble |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
110 these seem to correspond to the data, emphasis and mute control bits sent to CD hardware |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
111 format TOCT |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
112 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
113 set status format (2nd nibble) to RF_NOTREADY |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
114 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
115 set status format (2nd nibble) to RF_TOCT(4) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
116 copy first track number in BCD format to 3rd and 4th nibbles |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
117 copy last track number in BCD format to 5th and 6th nibbles |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
118 copy TOCTVERSION(0) in BCD format to 7th and 8th nibbles |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
119 store flags in 9th nibble |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
120 these seem to correspond to the data, emphasis and mute control bits sent to CD hardware |
|
f1c2415f4d1d
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Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
121 format TOCN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
122 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
123 set status format (2nd nibble) to RF_NOTREADY |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
124 store flags in 9th nibble |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
125 these seem to correspond to the data, emphasis and mute control bits sent to CD hardware |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
126 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
127 set status format (2nd nibble) to RF_TOCN(5) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
128 if requested trac is not valid |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
129 set status format (2nd nibble) to RF_NOTREADY(F) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
130 store flags in 9th nibble |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
131 these seem to correspond to the data, emphasis and mute control bits sent to CD hardware |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
132 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
133 copy track start time in MM:SS:FF format (BCD) to 3rd through 8th nibble (includisve) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
134 if track is a data track, force MSB of frame to 1 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
135 notably, since frame numbers sould be <75 this bit would always be zero otherwise |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
136 store low nibble of BCD track number in 8th nibble |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
137 format Error |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
138 set status format (2nd nibble) to RF_E(6) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
139 error number is placed in 3rd nibble |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
140 note emulator always writes 0 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
141 store flags in 9th nibble |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
142 these seem to correspond to the data, emphasis and mute control bits sent to CD hardware |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
143 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
144 state Stopping: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
145 if servo is in STOP status |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
146 if disc is known present or disc status is unknown |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
147 set drive status to STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
148 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
149 set drive status to NODISC |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
150 state TOCing: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
151 if servo is in STOP status |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
152 if focus is in NOTFOCUSING status |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
153 set haveDisc to FALSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
154 set haveDiscValid to TRUE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
155 set drive status to NODISC |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
156 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
157 do nothing this tick |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
158 elif haveDisc is FALSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
159 do nothing this tick (comments suggest this is an abnormal situation) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
160 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
161 set drive status to TOCREAD |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
162 if servo is NOT in PLAY status |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
163 stop here |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
164 if haveTOCValid is FALSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
165 process current Q subcode data for TOC entry (see GetTOC) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
166 if TOC reading is done |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
167 set haveTOCValid to true |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
168 SEEK command is set to mechanism for PBA of program area start |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
169 stop until next tick |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
170 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
171 stop until next tick |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
172 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
173 if havePAValid is TRUE (comments say this isn't supposed to happen) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
174 PAUSE command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
175 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
176 check Q subcode data to see if we have found the start of the Program Area |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
177 if we have |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
178 set havePAValid to TRUE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
179 SEEK command for start of first track is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
180 PAUSE command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
181 else if current block Q subcode is invalid or not Mode 1 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
182 SEEK to next block |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
183 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
184 SEEK forward 250 blocks |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
185 state Reading: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
186 state Seeking: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
187 state Pausing: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
188 state Playing: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
189 state Cuing: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
190 These 5 states share a common implementation |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
191 if servo status is STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
192 do nothing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
193 elif servo status is SEEK |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
194 if mechanism error status is NOERROR |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
195 set drive status to SEEK |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
196 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
197 STOP command sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
198 emulation state set to STOPPING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
199 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
200 if servo status is PAUSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
201 if drive status is NOT DISCEND |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
202 set drive status to PAUSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
203 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
204 if Q subcode CRC is bad OR Q Control ADR is not mode 1 OR Q subcode tracknum is not lead out |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
205 set drive status to PLAY |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
206 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
207 PAUSE command sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
208 set drive status to DISCEND |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
209 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
210 state FWDing: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
211 if servo status is STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
212 do nothing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
213 elif servo status is SEEK |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
214 if mechanism error status is NOERROR |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
215 set drive status to SCAN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
216 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
217 STOP command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
218 emulation state is set to STOPPING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
219 elif servo status is PAUSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
220 set drive status to DISCEND |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
221 else: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
222 set drive status to SCAN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
223 if Q subcode CRC is valid AND Q Control ADR is mode 1 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
224 if Q subcode tracknum indicates leadout |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
225 PAUSE command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
226 set drive status to DISCEND |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
227 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
228 if scanClock is 0 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
229 get ATIME from current Q subcode block |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
230 turn it into an LBA, then PBA |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
231 Add 100 to it |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
232 SEEK command sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
233 reset scanClock to SCANPLAYTIME(10) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
234 state RVSing: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
235 if servo status is STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
236 do nothing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
237 elif servo status is SEEK |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
238 if mechanism error status is NOERROR |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
239 set drive status to SCAN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
240 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
241 STOP command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
242 emulation state is set to STOPPING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
243 elif servo status is PAUSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
244 do nothing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
245 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
246 set drive status to SCAN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
247 if Q subcode CRC is valid AND Q Control ADR is mode 1 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
248 if Q subcode tracknum indcates we're in the leadin area |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
249 SEEK command is sent to mechanism for beginning of first track |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
250 PLAY command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
251 Set emulation state to PLAYING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
252 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
253 if scanClock is 0 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
254 get ATIME from current Q subcode block |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
255 turn it into an LBA, then PBA |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
256 subtract 140 from it |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
257 SEEK command sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
258 reset scanClock to SCANPLAYTIME(10) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
259 state Skipping: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
260 if servo status is STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
261 do nothing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
262 elif servo status is SEEK |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
263 if mechanism error status is NOERROR |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
264 set drive status to TRACKING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
265 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
266 STOP command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
267 emulation state is set to STOPPING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
268 elif servo status is PAUSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
269 set drive status to PAUSE |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
270 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
271 PAUSE command sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
272 state DoorClosing: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
273 if door state is CLOSING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
274 set drive status to TRAYMOVING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
275 elif door state is CLOSED |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
276 set drive status to STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
277 set request format to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
278 set emulation state to CLOSED |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
279 state DoorClosed: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
280 do nothing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
281 state DoorOpening: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
282 if door state is OPENING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
283 set drive status to TRAYMOVING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
284 elif door state is OPEN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
285 set drive status to DOOROPEN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
286 set emulation state to OPEN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
287 state DoorOpen: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
288 if door status is NOT one of OPEN or OPENING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
289 set emulation state to CLOSING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
290 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
291 command Nop |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
292 command Stop |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
293 set request format to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
294 if drive status is not DOOROPEN and status is notTRAYMOVING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
295 send stop command to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
296 set emulation state to ES_STOPPING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
297 command Report Request |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
298 4th nibble specifies request type |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
299 RF_A(0) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
300 set absolute time format |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
301 RF_R(1) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
302 set relative time format |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
303 RF_T(2) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
304 request current track info |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
305 RF_TOCO(3) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
306 request disc completion time |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
307 will be ignored if disc has not been validated yet |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
308 drive error status will be set to COMMANDERROR |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
309 request format will be set back to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
310 RF_TOCT(4) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
311 request start/end tracks on disc |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
312 if disc is validated and drive is stopped |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
313 will seek to start of disc and pause there |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
314 emulation state set to TOCing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
315 if disc is validated and drive is not stopped |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
316 only request format is changed |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
317 else |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
318 prepares memory state for TOC read |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
319 will seek to start of disc and tell mechanism to play |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
320 emulation state set to TOCing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
321 RF_TOCN(5) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
322 request start time of track N |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
323 if drivestatus is DOOROPEN, TRAYMOVING or STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
324 command will be ignore dand drive error status will be set to COMMANDERROR |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
325 request format will be set back to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
326 requested track number is in the 5th and 6th nibbles in BCD format |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
327 SEEK command sent to mechanism for start of disc |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
328 PAUSE command sent to mechansim |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
329 emulation state set to TOCing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
330 RF_E(6) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
331 request error info |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
332 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
333 command Read |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
334 if drive status is DOOROPEN or TRAYMOVING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
335 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
336 check request format, if it's TOCT or TOCN, force it to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
337 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
338 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
339 location specified in MM:SS:FF format (BCD) in the 3rd through 8th nibbles (inclusive) |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
340 location is converted to an LBA |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
341 if location >= leadout start |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
342 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
343 program area offset is added to location to convert it to a physical block address |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
344 PBA is adjusted back 4 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
345 SEEK command is sent to mechanism for adjusted PBA |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
346 PLAY command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
347 Emulation state set to Reading |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
348 command Seek |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
349 Same as Read, except sends Pause instead of Play for second command to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
350 Emulation state set to Seeking |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
351 command Pause |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
352 if drive status is DOOROPEN or TRAYMOVING or SCAN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
353 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
354 check request format, if it's TOCT or TOCN, force it to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
355 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
356 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
357 if drive status is STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
358 calculates PBA of first track from TOC |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
359 PBA is NOT adjusted back |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
360 send SEEK command to mechanism for calculated PBA |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
361 send PAUSE to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
362 set emulation state to Pausing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
363 command Play |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
364 if drive status is DOOROPEN or TRAYMOVING or DISCEND or DISCIN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
365 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
366 check request format, if it's TOCT or TOCN, force it to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
367 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
368 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
369 if drive status is TOCREAD or STOP |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
370 calculates PBA of first track from TOC |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
371 PBA is adjusted back by 4 |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
372 SEEK command is sent to mechanism for adjusted PBA |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
373 send PLAY command to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
374 set emulation state to Playing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
375 command Fwd |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
376 if drive status is NOT one of PLAY, PAUSE or DISCIN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
377 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
378 check request format, if it's TOCT or TOCN, force it to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
379 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
380 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
381 Send PLAY command to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
382 Emulation state set to Fwding |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
383 scanClock is set to SCANPLAYTIME(10)?? |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
384 command Rvs |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
385 if drive status is NOT one of PLAY, PAUSE or DISCEND |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
386 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
387 check request format, if it's TOCT or TOCN, force it to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
388 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
389 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
390 Send PLAY command to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
391 Emulation state set to Rvsing |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
392 command TrackSkip |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
393 if drive status is NOT one of PLAY, PAUSE or DISCEND |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
394 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
395 check request format, if it's TOCT or TOCN, force it to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
396 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
397 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
398 direction to skip is in 4th nibble of command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
399 number of tracks to skip is a 16-bit value in the 5th-8th nibbles |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
400 note tese are physical tracks i.e. loops of the spiral |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
401 SKIP command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
402 PAUSE command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
403 emulation state is set to TSkping |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
404 command TrackCue |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
405 if drive status is NOT one of STOP, PLAY, PAUSE, DISCEND, DISCIN or TOCREAD |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
406 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
407 if drive status is TOCREAD |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
408 check request format, if it's TOCT or TOCN, force it to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
409 if disc is not validated |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
410 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
411 track number is in nibbles 3 and 4 in BCD format |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
412 calculates PBA of requested track from TOC |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
413 Sends SEEK command to mechanism for calculated PBA |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
414 if drive status at start of command was STOP, DISCEND or DISCIN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
415 send PLAY command to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
416 emulation state is set to CUING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
417 command DoorClose |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
418 if drive status is NOT one of DOOROPEN or TRAYMOVING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
419 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
420 CLOSE command is set to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
421 emulation state is set to CLOSING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
422 command DoorOpen |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
423 if drive status is DOOROPEN |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
424 set drive error status to COMMANDERROR and stop processing command |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
425 if drive servo is not stopped: |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
426 set request format to absolute |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
427 OPEN command is sent to mechanism |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
428 emulation state set to OPENING |
|
f1c2415f4d1d
Move old notes into a subdir and add CDD MCU notes
Michael Pavone <pavone@retrodev.com>
parents:
diff
changeset
|
429 disc, TOC and program area validitly flags are cleared |