Hey everybody,
Just started using Xilinx XST as my synthesis tool and I'm just looking for the command line instruction (or GUI) to set the design frequency, I was using precision where it was "setup_design - frequency=66".
Anyone know the equivalent command for XST?
My eyes cant seem to find it in the documentation! :-(
Cheers,
Rob.
To learn the tool, just give ISE a known good synchronous hdl design file. It will tell you what Fmax is, and draw you an rtl schematic.
Then read the docs and the command files it made.
-- Mike Treseler
UCF file?
NET "clk" TNM_NET = "clk"; TIMESPEC "TS_clk" = PERIOD "clk" 0.025 us;
Hans
XST timing constraints are set up in the .xcf file
In the 9.2i XST user manual %xilinx%\doc\usenglish\books\docs\xst\xst.pdf
Look at: "XST Constraint File (XCF)", page 325 "XST timing options", page 336
The XST command line field is described in the first section listed above.
In the ISE GUI, you add this file to the flow by:
- right click on the "Synthesis - XST " line of the processes window, and select "Properties"
- in the "Synthesis Options" category: - set "Property Display Level" to "Advanced" - check the "Use Synthesis Constraints" button - fill in the "Synthesis Constraints File" field
If you want XST to forward annotate these to P&R tools, also check the "Write Timing Constraints" option.
Brian
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