ID:23354 By default, read_sdc on a synthesized snapshot loads only SDC-on-RTL constraints and SDC files with READ_DURING_POST_SYN_AND_POST_FIT_TIMING_ANALYSIS / READ_DURING_POST_SYN_AND_NOT_POST_FIT_TIMING_ANALYSIS assignments.

CAUSE: A synthesized snapshot was loaded in the timing analyzer, by default only SYN_SDC_FILE assignments are read during read_sdc.

ACTION: Use the -post_fit flag to have read_sdc read SDC files from other sources (SDC_FILE assignments, IP files etc.).