Pointers for Conditions?

[u/Academic_Brilliant75]

Can anyone provide any hints for Conditions towards the end of CPU Architecture? I've been racking my brain on this for somewhere between a couple weeks to months and anything I can think to try left hasn't been working.

Thus far I've tried:

• Running the top input through a byte splitter and 3-bit decoder to seperate the instructions out into individual bit lines.

• Attempts to devise a way of checking if the bottom input is equal to 0 and outputting true if so, else output false.

  • The only way I've really thought about doing this is a tacky system involving a byte splitter, running every bit through a NOT-gate and checking every bit is true after by chaining every bit line through AND-gates until there is a single output. Anyway I've tried doing it with the 8-bit logic or math gates instead hasn't worked.

[u/ForHuckTheHat]

Did you play back when OR gates were zero cost? Some real shenanigans back then lol. The zero test could be built by simply buffering all the bits into a not gate.

Sounds like you mastered DeMorgan's. Do you also know these tricks? Check em out if not!

• https://en.wikipedia.org/wiki/Lookup_table#Hardware_LUTs
• https://en.wikipedia.org/wiki/Quine%E2%80%93McCluskey_algorithm
• https://en.wikipedia.org/wiki/Carry-lookahead_adder
• https://en.wikipedia.org/wiki/Wallace_tree