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M1 TNM placed on net between PAD and BUFG/IBUF not forward traced
Keywords: TNM, propagate, forward trace
For the following arrangement:
IPAD -- clockpad -- IBUF -- clock
Placing a TNM on "clockpad" will not forward propagate the
TNM to all flip-flops this net goes to.
1 A TNM must be placed on
the output of the clock buffer (BUFG,BUFGP,BUFGS,BUFGLS,BUFGE)
or the input buffer (IBUF) for forward propagation to occur:
NET clock TNM = mygroup;
2 There is a new constraint for M1.5 called TNM_NET. If you replace TNM with TNM_NET it will trace through the buffer to the next synchronous element.