描述

How does the Bitgen configrate setting correspond to the actual CCLK frequency?

解决方案

The configrate setting corresponds directly to the CCLK frequency.

2 -> 2 MHz

6 -> 6 MHz

9 -> 9 MHz

13 -> 13 MHz

Be aware that there is a Tolerance of +/- 50% on this frequency generated by this internal oscillator. This is specified by the FMCCKTOL parameter in the Virtex-5 Data Sheet (DS202) which can be found here:

http://www.xilinx.com/support/documentation/virtex-5.htm