Re: Usefulness of internal pins which are (implicitly) buses?

Posted by WBahn on
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/Usefulness-of-internal-pins-which-are-implicitly-buses-tp4035549p4035555.html

Consider the instruction decoding process. Your CPU brings in a 16-bit signal and different pieces of that need to be routed to different parts. Six bits of it need to be sent to the ALU to select the operation that it will perform -- well, that's done with a six-bit internal bus. The alternative would be for you to have to define six different signals and connect each of them up to one pin of the CPU's input and one pin of the ALU.