Answers Database
M1 TNM placed on net between PAD and BUFG/IBUF not forward traced
Record #3016
Product Family: Software
Product Line: FPGA Implementation
Product Part: map
Problem Title:
M1 TNM placed on net between PAD and BUFG/IBUF not forward traced
Problem Description:
Urgency: standard
General Description:
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.
Solution 1:
There is a new constraint for M1.5 called TNM_NET. If you replace TNM with TNM_NET it will trace thr
ough the buffer to the next synchronous element.
Solution 2:
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;
End of Record #3016 - Last Modified: 11/12/98 12:58 |
