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generic: Don't assume unused LUT inputs are zero

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-12-01 17:07:36 +00:00
parent 89e15d488a
commit f57c2bcebb
2 changed files with 5 additions and 2 deletions
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3
generic/pack.cc
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@ -158,7 +158,8 @@ static void pack_constants(Context *ctx)
gnd_cell->ports.at(ctx->id("F")).net = gnd_net.get();
std::unique_ptr<CellInfo> vcc_cell = create_generic_cell(ctx, ctx->id("GENERIC_SLICE"), "$PACKER_VCC");
vcc_cell->params[ctx->id("INIT")] = 1;
// Fill with 1s
vcc_cell->params[ctx->id("INIT")] = Property(Property::S1).extract(0, (1 << ctx->args.K), Property::S1);
std::unique_ptr<NetInfo> vcc_net = std::unique_ptr<NetInfo>(new NetInfo);
vcc_net->name = ctx->id("$PACKER_VCC_NET");
vcc_net->driver.cell = vcc_cell.get();

4
generic/synth/cells_map.v
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@ -4,7 +4,9 @@ module \$lut (A, Y);
input [WIDTH-1:0] A;
output Y;
LUT #(.K(`LUT_K), .INIT(LUT)) _TECHMAP_REPLACE_ (.I(A), .Q(Y));
localparam rep = 1<<(`LUT_K-WIDTH);
LUT #(.K(`LUT_K), .INIT({rep{LUT}})) _TECHMAP_REPLACE_ (.I(A), .Q(Y));
endmodule
module \$_DFF_P_ (input D, C, output Q); DFF _TECHMAP_REPLACE_ (.D(D), .Q(Q), .CLK(C)); endmodule