In ISE design tools 11.4.1 and later, when I use the Serial RapidIO v5.4 core targeting a Virtex-6 device, an error similar to the following occurs:
"ERROR:PhysDesignRules:1997 - The computed value for the VCO operating frequency of MMCM_ADV instance phy_4x_ser_clk/u_rio_sercore_mmcm is calculated to be 468.750000 MHz. This falls below the operating range of the MMCM VCO frequency for this device of 600.000000 - 1200.000000 MHz. Please adjust either the input frequency CLKINx_PERIOD, multiplication factor CLKFBOUT_MULT_F or the division factor DIVCLK_DIVIDE, in order to achieve a VCO frequency within the rated operating range for this device."
| Answer Number | 问答标题 | 问题版本 | 已解决问题的版本 |
|---|---|---|---|
| 34019 | ISE Design Suite 11.4.1 - Known Issues for Virtex-6 FPGA Service Pack | N/A | N/A |