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AR# 34196

SPI-3 Link Layer v6.1/v7.1 - "ERROR:PhysDesignRules:1997 - The computed value for the VCO operating frequency of MMCM_ADV..."

Description

In ISE design tools 11.4.1 and later, when using the SPI-3 Link Layer v6.1 or v7.1 Core targeting a Virtex-6 device, an error similar to the following might occur in MAP:

"ERROR:PhysDesignRules:1997 - The computed value for the VCO operating frequency of MMCM_ADV instance rfmmcm is calculated to be 415.999983 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.
ERROR:PhysDesignRules:2063 - A CLKFBOUT_MULT_F setting of 4.0 for MMCM_ADV (block rfmmcm) cannot be supported at this time.
ERROR:PhysDesignRules:1997 - The computed value for the VCO operating frequency of MMCM_ADV instance tfmmcm is calculated to be 415.999983 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.
ERROR:PhysDesignRules:2063 - A CLKFBOUT_MULT_F setting of 4.0 for MMCM_ADV (block tfmmcm) can not be supported at this time.
ERROR:Pack:1642 - Errors in physical DRC."

Solution

To resolve this issue, please modify the MMCM attributes as described in (Xilinx Answer 33589).

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# 34196
Date Created 01/27/2010
Last Updated 12/15/2012
Status Active
Type General Article