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lnis-uofu / OpenFPGA

An Open-source FPGA IP Generator
https://openfpga.readthedocs.io/en/master/
MIT License
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How do I specify size of the FPGA tiling? #1385

Open nachiket opened 1 year ago

nachiket commented 1 year ago

I'm trying to generate an FPGA with different tiling configurations i.e. 2x2, 4x4, 8x8, etc. I see there are two places to edit the VPR size

  1. task.conf openfpga_vpr_device_layout=8x8
  2. OpenFPGA's arch.xml file <fixed_layout name="8x8" width="6" height="6">

I can't seem to get OpenFPGA to generate anything I specify in the place of the 8x8. It seems to always generate a 4x4 design.

I'm using fix_device_route_chan_width_example_script.openfpga shell script.

tangxifan commented 1 year ago

@nachiket Please check your openfpga shell script. We allow user to defined variables there.

https://github.com/lnis-uofu/OpenFPGA/blob/36babaaf2d876d563bd2e59133e3ef2aacac207d/openfpga_flow/openfpga_shell_scripts/fix_device_example_script.openfpga#L3

You can see the variable ${OPENFPGA_VPR_DEVICE_LAYOUT} in the openfpga shell script. When using the script, you can define the value of the variable through openfpga_vpr_device_layout in your task.conf file.

The layout name, e.g., 8x8, must be defined in the vpr arch file.

tangxifan commented 1 year ago

If the problem insists, please check the openfpgashell.log file and see the options of VPR.