Serial RapidIO v5.3 - Virtex-6 FPGA 1.25 Gbs simulations fail because the MMCM_ADV Unisim Model does not handle fractional values correctly

AR#	33193	Search For Another Answer
Topic	IP-RapidIO-Serial
Last Updated	09/09/2009
Status	Active

Description

Keywords: fractions

Known Issue: v5.3

Virtex-6 FPGA 1.25 Gbps simulations fail because of problems with the MMCM_ADV Unisim model. The model is not correctly handling fractional multiple and divide values.

Solution

Work around this problem by changing the following parameters on the 1.25 Gbps MMCM_ADV instantiation to the values shown here:

.CLKFBOUT_MULT_F (6.5),
.CLKOUT0_DIVIDE_F (13),
.CLKOUT1_DIVIDE (52),


Revision History
07/23/2009 - Initial Release
09/09/2009 - Added affected core version