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AR# 17906

6.1 EDK - How can input and output registers be automatically packed into IOB in XPS?


Keywords: EST, map, IOB, pack, registers, input, output, XPS

Urgency: Standard

After implementing a hardware design in XPS, some of the input and output registers are not placed in the IOB, but are in CLBs. How can XPS be changed to pack all input and output registers into the IOB?


Currently there is no GUI option that will cause input and output registers to be packed into the IOB. However, the "-pr" option can be set in the "fast_runtime.opt" file. This file contains all of the options for running implementation.

To set this option, go to "<project directory>\etc" and open the file "fast_runtime.opt" in an editor.
Under the line that reads
"Program map"
enter the option "-pr i|o|b" where i = input registers only, o = output registers only, and b= both input and output.

Save the file and rerun Generate Bitstream.

NOTE: You must run your project through implementation one time for this file to be created.
AR# 17906
Date 03/05/2006
Status Archive
Type General Article