What is the Timing relationship for the RST, PWRDWN, LOCKED ports of the 7-series MMCM ?
RST, PWRDWN and LOCKED are asynchronous signals. There is no timing relationship between them. The recomendation is to wait for the LOCKED signal to go High before starting any operation with the clocks on the MMCM.
LOCKED will go LOW when RST/PWRDWN is asserted.
The PWRDWN cannot be used like the RST since it powers down the internal regulators.
For minimum pulse requirement on the RST/PWRDWN, please refer to the data sheet.
For MMCM Maximum Lock time, please refer to the data sheet.