General Description: The values in the Virtex-II data sheet (rev 2.1) are different from the speed print values that are given for the timing parameter "Trck". The data sheet reports this value as 0.23ns; when I prepare a speed print for speed file 1.96, the timing is reported as 0.395 - 0.419 ns for the same parameter.
Which value is correct?
The values in the data sheet are incorrect; the data sheet is actually reporting the "Tsrck" values rather than the "Trck" value.
For the correct number, use the values that are reported by the timing software: Timing Analyzer, TRCE, FPGA Editor, or speed print.