Are the echo clocks CQ/CQ# differential clocks?

Question: Are the echo clocks CQ/CQ# differential clocks?

 

Answer:

CQ/CQ# are not differential clocks. These are pseudo differential clocks and 180 degrees out of phase with each other. CQ/CQ# are free running clocks and are synchronized to the input clocks (K/K#) and are source synchronous with the output data.