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AR# 47351

7 Series MMCM Spread Spectrum support details

Description

Spread Spectrum (SS)feature is supported according to the 7 Series Clocking Resources User Guide. How can this feature be implemented?

Solution

There is limited support for the Spread Spectrum (SS)feature in the MMCM in 7 series,ISE 13.4and after.The feature must be implemented by setting the appropriate attributes on an MMCM HDL instantiation.

Timing tools do not take spread spectrum into account in ISE Design Suite, so the user will have to manually account for the spread in timing constraints.

Timing for SS is supported in Vivado 2013.1

After reviewing the 7 Series Clocking Resources User Guide section on this topic, please contact Xilinx Technical Support for additional questions on the spread spectrum clocking feature of the MMCM.

Linked Answer Records

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
51561 7 Series - Manual Timing Adjustment required when using a MMCM with Spread Spectrum Clocks. N/A N/A
AR# 47351
Date Created 02/11/2013
Last Updated 02/11/2013
Status Active
Type Known Issues
Devices
  • Kintex-7
  • Artix-7
  • Virtex-7
  • Virtex-7 HT
Tools
  • ISE Design Suite - 13.4