OpenFPGA/openfpga_flow/vpr_arch/README.md

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Naming convention for VPR architecture files

Please reveal the following architecture features in the names to help quickly spot 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.
  • N<le_size>: Number of logic elements for a CLB. If you have multiple CLB architectures, this should be largest number.
  • tileable: If the routing architecture is tileable or not.
  • adder_chain: If hard adder/carry chain is used inside CLBs
  • register_chain: If shift register chain is used inside CLBs
  • scan_chain: If scan chain testing infrastructure is used inside CLBs
  • _mem<mem_size>: If block RAM (BRAM) is used or not. If used, the memory size should be clarified here. The keyword wide is to specify if the BRAM spanns more than 1 column.
  • aib: If the Advanced Interface Bus (AIB) is used in place of some I/Os.
  • multi_io_capacity: If I/O capacity is different on each side of FPGAs.
  • reduced_io: If I/Os only appear a certain or multiple sides of FPGAs
  • <feature_size>: The technology node which the delay numbers are extracted from.

Other features are used in naming should be listed here.