AR# 34195

Serial RapidIO v5.4 - "PhysDesignRules:1997 - The computed value for the VCO operating frequency of MMCM_ADV..."


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."


To resolve this issue, modify the MMCM attributes as described in (Xilinx Answer 34084), or update to v5.4 Rev1 of the core (available in ISE 11.5).

Linked Answer Records

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
34019 ISE Design Suite 11.4.1 - Known Issues for Virtex-6 FPGA Service Pack N/A N/A
AR# 34195
Date 12/15/2012
Status Active
Type General Article
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