Timing Relationship between Signals

If you have already designed some high speed PCBs or if you have been involved in some way in high speed PCB design, you must have come across design rules that require the difference in the length of the PCB trace to be within a specified limit.
These rules are often results of the relation between the clock and data signal timing. There is a timing window in which the data must arrive at the rising edge or falling edge of the clock. If the data arrives too early and goes away or if it arrives too late it is of no use.
Let us take some time to understand the concept of the setup and hold time and see how we can ensure its proper implementation at the PCB level.

referencedesigner