Comments on: The PCF file: Xilinx timing constraints as the tools understood them https://billauer.se/blog/2009/07/xilinx-timing-constraints-ucf-pcf-tnm-period-from-to/ Anything I found worthy to write down. Thu, 26 Mar 2026 13:15:15 +0000 hourly 1 http://wordpress.org/?v=3.1.2 By: mounika https://billauer.se/blog/2009/07/xilinx-timing-constraints-ucf-pcf-tnm-period-from-to/comment-page-1/#comment-1243 mounika Sat, 11 Mar 2017 18:03:48 +0000 https://billauer.se/blog/?p=302#comment-1243 i m using xilinx ise 10.1. i need to know how to estimate dynamic power and how to generate the .xml , .ncd, .pcf files in xilinx i m using xilinx ise 10.1. i need to know how to estimate dynamic power and how to generate the .xml , .ncd, .pcf files in xilinx

]]> By: eli https://billauer.se/blog/2009/07/xilinx-timing-constraints-ucf-pcf-tnm-period-from-to/comment-page-1/#comment-1216 eli Fri, 11 Nov 2016 13:16:45 +0000 https://billauer.se/blog/?p=302#comment-1216 Xilinx don't expect anyone to play around with the pcf files directly. So all constraints in the UCF file are in effect for all tools. How exactly the tools get this info, I can't say for sure, but I would put my money on the pcf file for the mapper, PAR, and Bitgen. Xilinx support should give you a more decisive answer. Xilinx don’t expect anyone to play around with the pcf files directly. So all constraints in the UCF file are in effect for all tools. How exactly the tools get this info, I can’t say for sure, but I would put my money on the pcf file for the mapper, PAR, and Bitgen.

Xilinx support should give you a more decisive answer.

]]> By: Aditya https://billauer.se/blog/2009/07/xilinx-timing-constraints-ucf-pcf-tnm-period-from-to/comment-page-1/#comment-1215 Aditya Fri, 11 Nov 2016 07:05:58 +0000 https://billauer.se/blog/?p=302#comment-1215 Hi Eli, Aditya, Electronics Graduate from India here. My question: The bitgen command creates a bit and if -g option is given also a bin file. An optional input file that the bitgen command accommodates is the pcf file (created as you stated during map command) Now when the pcf file is created and there is a manually created ucf file in the directory will the pcf file created during map have all the constraints present in the ucf file when it is created with map command? Hi Eli,
Aditya, Electronics Graduate from India here.

My question:
The bitgen command creates a bit and if -g option is given also a bin file.
An optional input file that the bitgen command accommodates is the pcf file (created as you stated during map command)
Now when the pcf file is created and there is a manually created ucf file in the directory will the pcf file created during map have all the constraints present in the ucf file when it is created with map command?

]]>