For Source Synchronous Output Interfaces, the output skew is desired with regard to the forwarded clock. A custom group report can be generated by specifying the reference port as the forwarded clock port. This table looks similar to "max/min delays for output buses" except the reference port is used as the reference bit for calculating source offset and bus skew.
As an example, for a DDR output skew calculation, if multiple bits (for example, rldiii_a[0-19], rldiii_ba[0-3], rldiii_ref_n, rldiii_we_n) should be grouped together with regard to the forwarded clock port (rldiii_ck_n[0]), the following command can be used:
report_datasheet -group [get_ports {rldiii_ck_n[0] rldiii_a[*] rldiii_ba[*]
rldiii_ref_n rldiii_we_n}] -name timing_1The first port in the group list is considered the reference pin.
For all these sections, the worst case data is calculated from multi-corner analysis. If -show_all_corners is used, the worst case data is reported for each corner separately.
The following figure shows the report data sheet for this example.
