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https://github.com/YosysHQ/yosys
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aff6ad1ce0
This adds support for infering more kinds of flip-flops: - FFs with async set/reset and clock enable - FFs with sync set/reset - FFs with sync set/reset and clock enable Some passes have been moved (and some added) in order for dff2dffs to work correctly. This gives us complete coverage of Virtex 6+ and Spartan 6 flip-flop capabilities (though not latch capabilities). Older FPGAs also support having both a set and a reset input, which will be handled at a later data.
51 lines
1.7 KiB
Plaintext
51 lines
1.7 KiB
Plaintext
read_verilog ../common/adffs.v
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design -save read
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hierarchy -top adff
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proc
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equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
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design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
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cd adff # Constrain all select calls below inside the top module
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select -assert-count 1 t:BUFG
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select -assert-count 1 t:FDCE
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select -assert-none t:BUFG t:FDCE %% t:* %D
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design -load read
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hierarchy -top adffn
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proc
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equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
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design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
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cd adffn # Constrain all select calls below inside the top module
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select -assert-count 1 t:BUFG
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select -assert-count 1 t:FDCE
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select -assert-count 1 t:INV
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select -assert-none t:BUFG t:FDCE t:INV %% t:* %D
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design -load read
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hierarchy -top dffs
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proc
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equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
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design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
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cd dffs # Constrain all select calls below inside the top module
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select -assert-count 1 t:BUFG
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select -assert-count 1 t:FDSE
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select -assert-none t:BUFG t:FDSE %% t:* %D
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design -load read
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hierarchy -top ndffnr
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proc
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equiv_opt -async2sync -assert -map +/xilinx/cells_sim.v synth_xilinx # equivalency check
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design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
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cd ndffnr # Constrain all select calls below inside the top module
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select -assert-count 1 t:BUFG
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select -assert-count 1 t:FDRE_1
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select -assert-count 1 t:INV
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select -assert-none t:BUFG t:FDRE_1 t:INV %% t:* %D
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