In the mire of timing constraint

Hello,

1. Assuming that you have actually written timing exceptions in your .sdc file and did not use the Time Quest Analyzer GUI [using GUI does not insert the statements in you .sdc file, you need to manually insert the timing statement in your .sdc file]

Each time you compile the design you the fitter places the registers etc. in different locations, so you may get timing violations if you have very tight timing constraints

2. In "Altera Wiki" Rysc has written a good guide to use Time quest Analyzer that might help you

Good luck,

AA