Re: SET UP AND HOLD ---which one has to be fixed first and w
hi,
Hold violation is critical then setup violation. y b'caz if your design is having hold violation it will affect the functionality of your chip, so you can’t use the chip. If u have setup violation by changing the input frequency of ur chip you can use the chip.
Yes, as said above hold violations are more critical.However we should fix setup violations in pre CTS ( CLOCK TREE SYNTHESIS) i.e. before P&R. Hold violations can be fix suitablly by inserting clock buffers in P&R stage.
Re: SET UP AND HOLD ---which one has to be fixed first and w
Hi Viswanadh,
Clock time period has a say in the setup time violations, meaning if you increase the clock time period, you can still live with the setup time violation but since hold time violation does not depend onthe clock, it is almost suicidal to tape out the chip with a single hold time violation(since its never gonna work).
Actually setup is also important since it decides the performance of the chip, but a low performance chip is still better than a useless chip.