Re: Understanding Clock Cycles

Posted by ybakos on Apr 13, 2010; 11:01pm
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/Understanding-Clock-Cycles-tp712205p717399.html

I disagree.

The DFF in TECS is is an edge-triggered, negative-transition flip-flop.

It's edge triggered because the output is only affected at the very moment of a tock. It's negative transition because the input(t-1) is reflected by output(t) when the voltage moves from 1 to 0 (more or less, there are physical thresholds).

Lastly, while I do like the book "Code" quite a bit, I wouldn't call it "authoritative." There are many small mistakes, and we should all realize that Petzold is trying to be illustrative, not necessarily authoritative.