TIMING-22: Missing External Delay on MMCM - TIMING-22: Missing External Delay on MMCM - 2021.2 English

TIMING-22: Missing External Delay on MMCM - TIMING-22: Missing External Delay on MMCM - 2021.2 English - UG906

Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906)

Document ID

UG906

Release Date

2021-10-27

Version

2021.2 English

The MMCM <CELL_NAME> has an external feedback loop but no external delay has been specified between FBOUT and FBIN. It is recommended to specify an external delay with set_external_delay between the two ports connected to the pins FBOUT and FBIN with an external feedback loop.