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micro-code_generator.py
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import typing
# Define Micro-code bits
HLT = int('100000000000000000000000', 2)
MI = int('10000000000000000000000', 2)
RI = int('1000000000000000000000', 2)
RO = int('100000000000000000000', 2)
II = int('10000000000000000000', 2)
IO = int('1000000000000000000', 2)
AI = int('100000000000000000', 2)
AO = int('10000000000000000', 2)
BI = int('1000000000000000', 2)
BO = int('100000000000000', 2)
EO = int('10000000000000', 2)
SO = int('1000000000000', 2)
FI = int('100000000000', 2)
OI = int('10000000000', 2)
OC = int('1000000000', 2)
O2 = int('100000000', 2)
CE = int('10000000', 2)
CI = int('1000000', 2)
CO = int('100000', 2)
JC = int('10000', 2)
JZ = int('1000', 2)
NXT = int('1', 2)
# Define Instructions
instructions = {
"NOP": int('0000', 2),
"LDA": int('0001', 2),
"ADD": int('0010', 2),
"SUB": int('0011', 2),
"STA": int('0100', 2),
"LDI": int('0101', 2),
"JMP": int('0110', 2),
"JC": int('0111', 2),
"JZ": int('1000', 2),
"RES6": int('1001', 2),
"RES7": int('1010', 2),
"RES8": int('1011', 2),
"RES9": int('1100', 2),
"CLR": int('1101', 2),
"OUT": int('1110', 2),
"HLT": int('1111', 2),
}
# Define Micro-steps
t0 = int('000', 2)
t1 = int('001', 2)
t2 = int('010', 2)
t3 = int('011', 2)
t4 = int('100', 2)
t5 = int('101', 2)
t6 = int('110', 2)
t7 = int('111', 2)
t = [t0, t1, t2, t3, t4, t5, t6, t7]
# Define Fetch Cycles
FETCH = [CO|MI, RO|II|CE]
# Generate the micro-code ROM
#
# Micro-code ROM Addressing scheme:
# i i i i t t t
# where:
# i -> is the binary representation of the instruction
# t -> is the current micro-code step
#
def main():
file = open("./microcode-rom", 'w')
file.write("v3.0 hex words plain\n")
for mnemonic in instructions:
# Binary representation of the mnemonic
instruction = instructions[mnemonic]
# Treat reserved instructions as NOP
if "RES" in mnemonic:
Write_NOP(instruction, file)
continue
match mnemonic:
case "NOP":
Write_NOP(instruction, file)
case "LDA":
Write_LDA(instruction, file)
case "ADD":
Write_ADD(instruction, file)
case "SUB":
Write_SUB(instruction, file)
case "STA":
Write_STA(instruction, file)
case "LDI":
Write_LDI(instruction, file)
case "JMP":
Write_JMP(instruction, file)
case "JC":
Write_JC(instruction, file)
case "JZ":
Write_JZ(instruction, file)
case "RES6":
Write_RES6(instruction, file)
case "RES7":
Write_RES7(instruction, file)
case "RES8":
Write_RES8(instruction, file)
case "RES9":
Write_RES9(instruction, file)
case "CLR":
Write_CLR(instruction, file)
case "OUT":
Write_OUT(instruction, file)
case "HLT":
Write_HLT(instruction, file)
case _:
print("Warning: No case for instruction -> " + mnemonic)
Write_NOP(instruction, file)
file.close()
# Generate NOP Micro-code for an instruction
def Write_NOP(instruction: int, file: typing.TextIO):
file.writelines(Gen_Microcode(instruction, NXT))
# Generate LDA Micro-code for an instruction
def Write_LDA(instruction: int, file: typing.TextIO):
i2 = IO|MI
i3 = RO|AI
file.writelines(Gen_Microcode(instruction, i2, i3))
# Generate ADD Micro-code for an instruction
def Write_ADD(instruction: int, file: typing.TextIO):
i2 = IO|MI
i3 = RO|BI
i4 = EO|AI|FI
file.writelines(Gen_Microcode(instruction, i2, i3, i4))
# Generate SUB Micro-code for an instruction
def Write_SUB(instruction: int, file: typing.TextIO):
i2 = IO|MI
i3 = RO|BI
i4 = SO|EO|AI|FI
file.writelines(Gen_Microcode(instruction, i2, i3, i4))
# Generate STA Micro-code for an instruction
def Write_STA(instruction: int, file: typing.TextIO):
i2 = IO|MI
i3 = AO|RI
file.writelines(Gen_Microcode(instruction, i2, i3))
# Generate LDI Micro-code for an instruction
def Write_LDI(instruction: int, file: typing.TextIO):
i2 = IO|AI
file.writelines(Gen_Microcode(instruction, i2))
# Generate JMP Micro-code for an instruction
def Write_JMP(instruction: int, file: typing.TextIO):
i2 = IO|CI
file.writelines(Gen_Microcode(instruction, i2))
# Generate JC Micro-code for an instruction
def Write_JC(instruction: int, file: typing.TextIO):
i2 = JC
file.writelines(Gen_Microcode(instruction, i2))
# Generate JZ Micro-code for an instruction
def Write_JZ(instruction: int, file: typing.TextIO):
i2 = JZ
file.writelines(Gen_Microcode(instruction, i2))
# Generate RES6 Micro-code for an instruction
def Write_RES6(instruction: int, file: typing.TextIO):
i2 = NXT
file.writelines(Gen_Microcode(instruction, i2))
# Generate RES7 Micro-code for an instruction
def Write_RES7(instruction: int, file: typing.TextIO):
i2 = NXT
file.writelines(Gen_Microcode(instruction, i2))
# Generate RES8 Micro-code for an instruction
def Write_RES8(instruction: int, file: typing.TextIO):
i2 = NXT
file.writelines(Gen_Microcode(instruction, i2))
# Generate RES9 Micro-code for an instruction
def Write_RES9(instruction: int, file: typing.TextIO):
i2 = NXT
file.writelines(Gen_Microcode(instruction, i2))
# Generate CLR Micro-code for an instruction
def Write_CLR(instruction: int, file: typing.TextIO):
i2 = OC
file.writelines(Gen_Microcode(instruction, i2))
# Generate OUT Micro-code for an instruction
def Write_OUT(instruction: int, file: typing.TextIO):
i2 = AO|OI
file.writelines(Gen_Microcode(instruction, i2))
# Generate HLT Micro-code for an instruction
def Write_HLT(instruction: int, file: typing.TextIO):
i2 = HLT
file.writelines(Gen_Microcode(instruction, i2))
# Generate Microcode for each specified step for a given instruction
# This function returns the lines needed for writing to the Micro-Code ROM
def Gen_Microcode(instruction: int, i2: int, i3: int = int('00001', 16), i4: int = int('00001', 16), i5: int = int('00001', 16), i6: int = int('00001', 16), i7: int = int('00001', 16)) -> typing.List[str]:
lines: typing.List[str] = []
for step in t:
romAddress = "{0:02x}: ".format(int(str(f'{instruction:x}' + f'{t[step]:x}'), 16))
romAddress = ""
# Define Fetch Cycle
if(step == t0 or step == t1):
microcode = "{0:06x} ".format(FETCH[step])
lines.append(romAddress + microcode)
continue
if step == t2:
microcode = "{0:06x} ".format(i2)
elif step == t3:
microcode = "{0:06x} ".format(i3)
elif step == t4:
microcode = "{0:06x} ".format(i4)
elif step == t5:
microcode = "{0:06x} ".format(i5)
elif step == t6:
microcode = "{0:06x} ".format(i6)
elif step == t7:
microcode = "{0:06x}\n".format(i7)
else:
print("ERROR: Unknown time step -> " + str(step))
exit()
lines.append(romAddress + microcode)
return lines
if __name__ == "__main__":
main()