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AR# 1715

5.x PAR, XDELAY - TNM attached to net between PAD and IBUF/BUFG not forward traced

Description

If a TNM attribute is attached to a net, normally that TNM is forward traced
until it reaches all flip-flops that connect to that net. Those flip-flops
then become part of that TNM group.
However, because of ambiguities in the .XNF format, a TNM attribute placed
on the net between the PAD and IBUF or BUFG will not be forward traced.
Instead, it will be placed on the PAD itself.

Solution

Place the TNM on the net that is sourced by the output of the
IBUF or BUFG. Always avoid placing TNMs on the net that goes
to the PAD.

AR# 1715
Date Created 08/31/2007
Last Updated 03/22/2000
Status Archive
Type ??????