Hello,
I asked some time ago for constraints learning materials. It is hard to learn only with reading, I think I should try it.
Here comes the time when I think only that can help me. I have problem with sending data to SD memory. Data output and checksum values seem to be fine, but SD says that there is checksum error. It works with 50MHz. I suppose that there might be some delay between clock and data, maybe you could suggest something else?
Could you help me with applying constraints to let the tools know that they should be more careful with that sensitive data output part of design?
The only constraint, besides LOC for pinout, which I use is: NET "clock" TNM_NET = "tnm_clock"; TIMESPEC "TS_clock" = PERIOD "tnm_clock" 20 ns HIGH 50 %;
But to be honest I don't see much difference with or without it. I just read that it is one of basic and "must be" constraint.
Best regards, Pavel
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