generate rom table

alu_rom.py

                                                                                        
class Line(object):
    def __init__(self, addr_pattern):
        self.ins = addr_pattern.split(" ")[0].strip()
        self.out = addr_pattern.split(" ")[1].strip()

    def out_format(self):
        return self.out.replace("x", "0")
    def matches(self, addr):
        # addr is a string of 0 and 1 chars.                                                       
        if len(self.ins) != len(addr):
            return False
        for (bit1, bit2) in zip(self.ins, addr):
            if bit1 == "-": continue
            if bit1 != bit2: return False
        return True

def ROM():
    lines = map(Line, [
        # S[2:0],Start,N,Z  <space> S'[2:0], ASEL, ALE, BSEL, BLE, FN, BUSY      
        "000000 000000000",
        "0001-- 001000000",
        "001--- 010010100",
        "010-00 011101001",
        "010-10 100101001",
        "010--1 000101001",
        "011--- 01011x001",
        "100--- 010x01111",
    ])

    bad_state_output = "000000000"

    for i in range(1<<6):
        addr = "{0:06b}".format(i)
        bad_state = True
        prefix = "0b" + addr + "_"
        for line in lines:
            if line.matches(addr):
                print(prefix + line.out_format())
                bad_state = False
        if bad_state:
            print(prefix + bad_state_output)


if __name__ == "__main__":
    ROM()