6bit Linear Ramp Analogue to Digital Converter

uwotm8 said:

XOR gate! Which can be implemented using the PLA.

The only misunderstanding I now have is that we want bit 3 to be changed when bit 0, 1 and 2 are HI (0111 not 0110) and yet you were leading me to only XOR 1 and 2. Where does bit 0 come into play, or am I missing something?

Perhaps: (Bit 0 AND Bit 1) XOR Bit 2?

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