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Add some logic analyzer captures, a Python script for analyzing said captures and a higher level analysis of the output
author Mike Pavone <pavone@retrodev.com>
date Tue, 06 Nov 2012 01:57:36 -0800
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children 006008a3f370
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4:6f6a2d7cc889 6:b231162c8fdd
1 #!/usr/bin/env python
2
3 #0 - !SE
4 #1 - !CAS
5 #2 - A0
6 #3 - A1
7 #------
8 #4 - A2
9 #5 - A3
10 #6 - A7
11 #7 - EDCLK
12 #------
13 #8 - !HSYNC
14 #9 - A4
15 #A - A5
16 #B - A6
17 #------
18 #C - !RAS
19 #D - !WB/!WE
20 #E - !DT/!OE
21 #F - SC
22
23
24 #VRAM swizzling
25 #A0 = V0
26 #A1 = V1
27 #A8 = V2
28 #A9 = V3
29 #A10 = V4
30 #A11 = V5
31 #A12 = V6
32 #A13 = V7
33 #A14 = V8
34 #A15 = V9
35 #--guesses follow--
36 #A2 = V10
37 #A3 = V11
38 #A4 = V12
39 #A5 = V13
40 #A6 = V14
41 #A7 = V15
42
43
44 def get_addr(sample):
45 return ((sample >> 2) & 0xF) | ((sample >> 5) & 0x70) | ((sample << 1) & 0x80)
46
47 def swizzle_addr(addr):
48 return (addr & 0x0003) | ((addr >> 6) & 0x03FC) | ((addr << 8) & 0xFC00)
49
50 def print_addr_op(addr, addr_format, mode, samplenum, triggerpos, rate):
51 print '{0:{1}} ({2:{1}}) {3}@{4} ns'.format(swizzle_addr(addr), addr_format, addr, mode, (samplenum - triggerpos)*rate)
52
53 def detect_rise(last, sample, bit):
54 mask = 1 << bit
55 return (not last & mask) and (sample & mask)
56
57 def detect_fall(last, sample, bit):
58 mask = 1 << bit
59 return (last & mask) and (not sample & mask)
60
61 def detect_high(sample, bit):
62 mask = 1 << bit
63 return sample & mask
64
65
66 cas = 0x1
67 ras = 0xC
68 edclk = 0x7
69 hsync = 0x8
70 wewb = 0xD
71 oedt = 0xE
72 sc = 0xF
73
74 last = False
75 state = 'begin'
76 triggerpos = 0
77 readcounter = 0
78 sillyread = 0
79 lastaddr = -1
80 edclk_ticks = 0
81 sc_ticks = 0
82 tick_start = False
83 #f = open('street_fighter_vram_100mhz_hsync_trig_2.ols')
84 #f = open('street_fighter_vram_50mhz_hsync_trig.ols')
85 from sys import argv,exit
86 if len(argv) < 2:
87 print 'usage: analyze.py filename'
88 exit(1)
89 if '-b' in argv:
90 addr_format = '016b'
91 else:
92 addr_format = '04X'
93 f = open(argv[1])
94 for line in f:
95 if line.startswith(';TriggerPosition'):
96 _,_,triggerpos = line.partition(':')
97 triggerpos = int(triggerpos.strip())
98 elif line.startswith(';Rate'):
99 _,_,rate = line.partition(':')
100 #convert to nanoseconds between samples
101 rate = (1.0/float(rate.strip())) * 1000000000.0
102 elif not line.startswith(';'):
103 sample,_,samplenum = line.partition('@')
104 samplenum = int(samplenum.strip())
105 sample = int(sample, 16)
106 if detect_rise(last, sample, edclk):
107 edclk_ticks += 1
108 if detect_rise(last, sample, sc):
109 sc_ticks += 1
110 if not (last is False):
111 #detect falling edge of !HSYNC
112 if detect_fall(last, sample, hsync):
113 if readcounter:
114 print readcounter, 'reads,', sillyread, 'redundant reads'
115 readcounter = sillyread = 0
116 if not tick_start is False:
117 float(edclk_ticks)/((rate * (samplenum-tick_start)) / 1000.0)
118 print 'EDCLK:', edclk_ticks, ' ticks, {0}MHz'.format(float(edclk_ticks)/((rate * (samplenum-tick_start)) / 1000.0))
119 print 'SC:', sc_ticks, ' ticks, {0}MHz'.format(float(sc_ticks)/((rate * (samplenum-tick_start)) / 1000.0))
120 tick_start = samplenum
121 edclk_ticks = sc_ticks = 0
122 print 'HSYNC Start'
123 #detect rising edge of !HSYNC
124 elif detect_rise(last, sample, hsync):
125 if not tick_start is False:
126 float(edclk_ticks)/((rate * (samplenum-tick_start)) / 1000.0)
127 print 'EDCLK:', edclk_ticks, ' ticks, {0}MHz'.format(float(edclk_ticks)/((rate * (samplenum-tick_start)) / 1000.0))
128 print 'SC:', sc_ticks, ' ticks, {0}MHz'.format(float(sc_ticks)/((rate * (samplenum-tick_start)) / 1000.0))
129 tick_start = samplenum
130 edclk_ticks = sc_ticks = 0
131 print 'HSYNC End'
132 if state == 'begin':
133 #detect falling edge of !RAS
134 if detect_fall(last, sample, ras):
135 state = 'ras'
136 row = get_addr(sample)
137 mode = 'ram' if detect_high(sample, oedt) else 'read transfer'
138 elif detect_fall(last, sample, cas):
139 state = 'cas'
140 elif state == 'ras':
141 if detect_fall(last, sample, cas):
142 state = 'begin'
143 col = get_addr(sample)
144 addr = (row << 8) | col
145 if mode == 'ram':
146 state = 'ras_cas'
147 else:
148 print_addr_op(addr, addr_format, mode, samplenum, triggerpos, rate)
149 lastaddr = addr
150 #print '{0:04X} {1} - {2:02X}:{3:02X} - {0:016b}'.format(addr, mode, row, col)
151 elif state == 'cas':
152 if detect_fall(last, sample, ras):
153 state = 'begin'
154 print 'refresh@{0} ns'.format((samplenum - triggerpos)*rate)
155 elif state == 'ras_cas':
156 if detect_fall(last, sample, oedt):
157 readcounter += 1
158 if addr == lastaddr:
159 sillyread += 1
160 print_addr_op(addr, addr_format, 'read', samplenum, triggerpos, rate)
161 state = 'begin'
162 elif detect_fall(last, sample, wewb):
163 print_addr_op(addr, addr_format, 'write', samplenum, triggerpos, rate)
164 state = 'begin'
165 last = sample