--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/analyze.py	Tue Nov 06 01:57:36 2012 -0800
@@ -0,0 +1,165 @@
+#!/usr/bin/env python
+
+#0 - !SE
+#1 - !CAS
+#2 - A0
+#3 - A1
+#------
+#4 - A2
+#5 - A3
+#6 - A7
+#7 - EDCLK
+#------
+#8 - !HSYNC
+#9 - A4
+#A - A5
+#B - A6
+#------
+#C - !RAS
+#D - !WB/!WE
+#E - !DT/!OE
+#F - SC
+
+
+#VRAM swizzling
+#A0 = V0
+#A1 = V1
+#A8 = V2
+#A9 = V3
+#A10 = V4
+#A11 = V5
+#A12 = V6
+#A13 = V7
+#A14 = V8
+#A15 = V9
+#--guesses follow--
+#A2 = V10
+#A3 = V11
+#A4 = V12
+#A5 = V13
+#A6 = V14
+#A7 = V15
+
+
+def get_addr(sample):
+	return ((sample >> 2) & 0xF) | ((sample >> 5) & 0x70) | ((sample << 1) & 0x80)
+
+def swizzle_addr(addr):
+	return (addr & 0x0003) | ((addr >> 6) & 0x03FC) | ((addr << 8) & 0xFC00)
+
+def print_addr_op(addr, addr_format, mode, samplenum, triggerpos, rate):
+	print '{0:{1}} ({2:{1}}) {3}@{4} ns'.format(swizzle_addr(addr), addr_format, addr, mode, (samplenum - triggerpos)*rate)
+
+def detect_rise(last, sample, bit):
+	mask = 1 << bit
+	return (not last & mask) and (sample & mask)
+	
+def detect_fall(last, sample, bit):
+	mask = 1 << bit
+	return (last & mask) and (not sample & mask)
+
+def detect_high(sample, bit):
+	mask = 1 << bit
+	return sample & mask
+
+
+cas = 0x1
+ras = 0xC
+edclk = 0x7
+hsync = 0x8
+wewb = 0xD
+oedt = 0xE
+sc = 0xF
+
+last = False
+state = 'begin'
+triggerpos = 0
+readcounter = 0
+sillyread = 0
+lastaddr = -1
+edclk_ticks = 0
+sc_ticks = 0
+tick_start = False
+#f = open('street_fighter_vram_100mhz_hsync_trig_2.ols')
+#f = open('street_fighter_vram_50mhz_hsync_trig.ols')
+from sys import argv,exit
+if len(argv) < 2:
+	print 'usage: analyze.py filename'
+	exit(1)
+if '-b' in argv:
+	addr_format = '016b'
+else:
+	addr_format = '04X'
+f = open(argv[1])
+for line in f:
+	if line.startswith(';TriggerPosition'):
+		_,_,triggerpos = line.partition(':')
+		triggerpos = int(triggerpos.strip())
+	elif line.startswith(';Rate'):
+		_,_,rate = line.partition(':')
+		#convert to nanoseconds between samples
+		rate = (1.0/float(rate.strip())) * 1000000000.0
+	elif not line.startswith(';'):
+		sample,_,samplenum = line.partition('@')
+		samplenum = int(samplenum.strip())
+		sample = int(sample, 16)
+		if detect_rise(last, sample, edclk):
+			edclk_ticks += 1
+		if detect_rise(last, sample, sc):
+			sc_ticks += 1
+		if not (last is False):
+			#detect falling edge of !HSYNC
+			if detect_fall(last, sample, hsync):
+				if readcounter:
+					print readcounter, 'reads,', sillyread, 'redundant reads'
+					readcounter = sillyread = 0
+				if not tick_start is False:
+					float(edclk_ticks)/((rate * (samplenum-tick_start)) / 1000.0)
+					print 'EDCLK:', edclk_ticks, ' ticks, {0}MHz'.format(float(edclk_ticks)/((rate * (samplenum-tick_start)) / 1000.0))
+					print 'SC:', sc_ticks, ' ticks, {0}MHz'.format(float(sc_ticks)/((rate * (samplenum-tick_start)) / 1000.0))
+				tick_start = samplenum
+				edclk_ticks = sc_ticks = 0
+				print 'HSYNC Start'
+			#detect rising edge of !HSYNC
+			elif detect_rise(last, sample, hsync):
+				if not tick_start is False:
+					float(edclk_ticks)/((rate * (samplenum-tick_start)) / 1000.0)
+					print 'EDCLK:', edclk_ticks, ' ticks, {0}MHz'.format(float(edclk_ticks)/((rate * (samplenum-tick_start)) / 1000.0))
+					print 'SC:', sc_ticks, ' ticks, {0}MHz'.format(float(sc_ticks)/((rate * (samplenum-tick_start)) / 1000.0))
+				tick_start = samplenum
+				edclk_ticks = sc_ticks = 0
+				print 'HSYNC End'
+			if state == 'begin':
+				#detect falling edge of !RAS
+				if detect_fall(last, sample, ras):
+					state = 'ras'
+					row = get_addr(sample)
+					mode = 'ram' if detect_high(sample, oedt) else 'read transfer'
+				elif detect_fall(last, sample, cas):
+					state = 'cas'
+			elif state == 'ras':
+				if detect_fall(last, sample, cas):
+					state = 'begin'
+					col = get_addr(sample)
+					addr = (row << 8) | col
+					if mode == 'ram':
+						state = 'ras_cas'
+					else:
+						print_addr_op(addr, addr_format, mode, samplenum, triggerpos, rate)
+					lastaddr = addr
+					#print '{0:04X} {1} - {2:02X}:{3:02X} - {0:016b}'.format(addr, mode, row, col)
+			elif state == 'cas':
+				if detect_fall(last, sample, ras):
+					state = 'begin'
+					print 'refresh@{0} ns'.format((samplenum - triggerpos)*rate)
+			elif state == 'ras_cas':
+				if detect_fall(last, sample, oedt):
+					readcounter += 1
+					if addr == lastaddr:
+						sillyread += 1
+					print_addr_op(addr, addr_format, 'read', samplenum, triggerpos, rate)
+					state = 'begin'
+				elif detect_fall(last, sample, wewb):
+					print_addr_op(addr, addr_format, 'write', samplenum, triggerpos, rate)
+					state = 'begin'
+		last = sample