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AR# 40871

MIG 7 Series v1.1 - The minimum frequency for QDRII+ designs is 200 MHz


Currently, MIG 7 Series v1.1 allows the user to specify a frequency less than 200 MHz for QDRII+ designs.

However this should not be done as the QDRII+ design does not work properly at frequencies less than 200 MHz.


In order for the PLLE2 to generate the 6.25% duty cycle on the sync pulse, the frequency must not be lower than 200 MHz.

The minimum frequency is scheduled to be set to 200 MHz in the MIG 7 Series GUI (starting with the ISE 13.2 software release).

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
40050 MIG 7 Series v1.1 - Release Notes and Known Issues for ISE Design Suite 13.1 N/A N/A
AR# 40871
Date Created 02/23/2011
Last Updated 08/26/2014
Status Active
Type Known Issues
  • Kintex-7
  • MIG