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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).
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