New to TimeQuest... Need help to add constraints and delays!

Lee,

Am I right that you are in fact using a FT232 chip but then in FT245 synchronous style? I had to search a bit before I found that application note.

One way to go is to make sure that the IO data for output is registered, e.g. being the registered output of a FIFO.

Another way is to add a register to everything that goes to the FT-chip. This will meet timing. But not function as you now may write when the FT-chip signals full. The idea is that you now recognize such a 'MISSED_WRITE' and modify your writing state machine to cope with that and re-submit that not-written data when the flag goes inactive again.

BTW you don't have to declare a virtual clock, you can use the incoming clock to specify the output delays.

Good luck!

Josy