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[/] [a-z80/] [trunk/] [resources/] [process-pla.py] - Rev 3
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#!/usr/bin/env python # # This script reads the original Z80 PLA table and processes it to get the list of PLA # entries in the form suitable to load into the PLA checker program. # # Format of the output PLA table: # 7 bits of modifiers: # loc 0 If "1", IX or IY flag is reset |\ # 1 If "1", IX or IY flag is set | Only 1 of these 2 can be set # 2 If "1", in HALT state # 3 If "1", ALU operation # 4 If "1", XX regular instruction |\ # 5 If "1", CB instruction table modifier | Only 1 of these 3 can be set # 6 If "1", ED instruction table modifier |/ # # Following 16 bits of opcode test in pairs, from bit7 to bit0 # For each pair, if the left bit is "1", the opcode bit has to be 0 # if the right bit is "1", the opcode bit has to be 1 # otherwise the bit is ignored # #------------------------------------------------------------------------------- # Copyright (C) 2014 Goran Devic # # This program is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by the Free # Software Foundation; either version 2 of the License, or (at your option) # any later version. # # This program is distributed in the hope that it will be useful, but WITHOUT # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for # more details. #------------------------------------------------------------------------------- import string import os # Input PLA table: a text file representing the original (Z80 reverse-engineered) # table at http://arcfn.com/files/z80-pla-table.html inFile = "z80-pla-original.txt" # Output processed PLA table outFile = "z80-pla.txt" table = [] def xtostr ( condition ): if condition: return "1" return "." # Read the content of the input PLA table and add all valid lines (starting with a number) with open(inFile, 'r') as fIn: for line in fIn: seg = line.split() if len(seg)>1 and seg[0].isdigit(): table.append(line) # In the original PLA table, entries are listed in reverse order - table.reverse() # Control ID to detect errors controlID = 0 with open(outFile, 'w') as fOut: fOut.write("# Automatically generated by process-pla.py\n") pla = [] for entry in table: # This is an example of an input PLA entry containing different segments: # ID ALU XX CB ED 0 /0 1 /1 2 /2 6 /6 7 /7 3 /3 4 /4 5 /5 Instruction Ex Description # 59 1 1 . . . . . . . . . 1 1 . 1 . . 1 . 1 01110xxx ce ld (hl),r (and hlt) # 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 seg = entry.split() if len(seg)>22: # Sanity check if controlID!=int(seg[0]): fOut.write("Unexpected entry " + seg[0]) exit(-1) controlID = controlID + 1 # Decipher [22] into actual PLA entry lines IXY0, IXY1 and HALT (a, b, c) entry = "" entry += xtostr("a" in seg[22]) entry += xtostr("b" in seg[22]) entry += xtostr("c" in seg[22]) # Append the rest of the PLA modifiers: ALU, XX, CB and ED entry += seg[1] + seg[2] + seg[3] + seg[4] + ' ' # Add the instruction decoder bit7 through bit0 in that order # 7 /7 6 /6 5 /5 4 /4 3 /3 2 /2 1 /1 0 /0 entry += seg[13]+seg[14] +seg[11]+seg[12] +seg[19]+seg[20] +seg[17]+seg[18] +seg[15]+seg[16] +seg[9]+seg[10] +seg[7]+seg[8] +seg[5]+seg[6] # Check if the new PLA entry is a duplicate (already stored to PLA) # Append "D" for duplicate entries so they can be skipped easily if entry in pla: fOut.write(entry + "\tD\t") else: # Store the new PLA line in the PLA list and write it out pla.append(entry) fOut.write(entry + "\t-\t") # Write the ID number, text decode and description fOut.write(seg[0] + "\t" + seg[21] + "\t" + ' '.join(seg[23:len(seg)]) + "\n") # The original PLA table passes individual opcode bits that are needed to decode many # instructions but it does not contain concrete entries # We append those bits to the end of our PLA table fOut.write("....... ...............1\t-\t99\txxxxxxx1\topcode[0]\n") fOut.write("....... .............1..\t-\t100\txxxxxx1x\topcode[1]\n") fOut.write("....... ...........1....\t-\t101\txxxxx1xx\topcode[2]\n") fOut.write("....... .........1......\t-\t102\txxxx1xxx\topcode[3]\n") fOut.write("....... .......1........\t-\t103\txxx1xxxx\topcode[4]\n") fOut.write("....... .....1..........\t-\t104\txx1xxxxx\topcode[5]\n")
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