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AR# 22871

7.1i PAR: "INFO:Par:252 - The MAP -timing placement will be discarded and your design will be placed using the command line options specified in PAR."

Description

Keywords: extra effort, -xe, Warning, 251

I ran my design through MAP with the -timing option, but when I run PAR with the -xe switch, I receive the following messages. This happens even if I specify -xe in my MAP command line.


"WARNING:Par:251 - Map -timing was run with a lower effort level setting than you are using for PAR. Xilinx recommends that you rerun Map -timing with the effort level that you have set in PAR to achieve better design performance.
INFO:Par:252 - The Map -timing placement will be discarded and your design will be placed using the command line options specified in PAR."

How can I make PAR keep the placement from MAP -timing?

Solution

In the 8.1i software, the MAP -timing placement will be kept if the -xe option in the MAP command line has the same or higher effort level than in PAR.

For example,

map -p xc2vp2-fg256-7 -timing -ol high -xe n -t 1 -cm area -pr b -k 4 -tx off -o stopwatch_map.ncd stopwatch.ngd stopwatch.pcf

par -ol high -xe n -t 1 stopwatch_map.ncd stopwatch.ncd stopwatch.pcf

will not result in replacement.

In ISE 7.1is3 and later, you can also use the -p option in PAR to prevent the placer from running.
AR# 22871
Date Created 09/04/2007
Last Updated 10/20/2008
Status Archive
Type General Article