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[Doc] Update README in openfpga arch directory for native fracturable LUT design

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tangxifan 2020-11-25 22:19:20 -07:00
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openfpga_flow/openfpga_arch/README.md
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Please reveal the following architecture features in the names to help quickly spot architecture files.
Note that an OpenFPGA architecture can be applied to multiple VPR architecture files.
- k<lut\_size>: Look-Up Table (LUT) size of FPGA. If you have fracturable LUTs or multiple LUT circuits, this should be largest input size.
- frac: If fracturable LUT is used or not.
- k<lut\_size>\_<frac><Native>: Look-Up Table (LUT) size of FPGA. If you have fracturable LUTs or multiple LUT circuits, this should be largest input size.
* The keyword 'frac' is to specify if fracturable LUT is used or not.
* The keyword 'Native' is to specify if fracturable LUT design is a native one (without mode switch) or a standard one (with mode switch).
- N<le\_size>: Number of logic elements for a CLB. If you have multiple CLB architectures, this should be largest number.
- adder\_chain: If hard adder/carry chain is used inside CLBs
- register\_chain: If shift register chain is used inside CLBs