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Add SB_LUT4 to box library

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This commit is contained in:
Eddie Hung 2019-04-16 17:34:11 -07:00
parent 7980118d74
commit 743c164eee
3 changed files with 16 additions and 0 deletions
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7
techlibs/ice40/cells.box
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@ -1,6 +1,13 @@
# From https://github.com/cliffordwolf/icestorm/blob/81c33a3/icefuzz/timings_hx8k.txt
# NB: Inputs/Outputs must be ordered alphabetically
# Inputs: CI I0 I1
# Outputs: CO
SB_CARRY 1 1 3 1
126 259 231
# Inputs: I0 I1 I2 I3
# Outputs: O
SB_LUT4 2 1 4 1
316 379 400 449

7
techlibs/ice40/cells_box.v
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@ -3,3 +3,10 @@ module SB_CARRY (output CO, input CI, I0, I1);
assign CO = (I0 && I1) || ((I0 || I1) && CI);
endmodule
(* abc_box_id = 2 *)
module SB_LUT4 (output O, input I0, I1, I2, I3);
parameter [15:0] LUT_INIT = 0;
// Indicate this is a black-box
assign O = 1'b0;
endmodule

2
techlibs/ice40/lut.lut
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@ -1,3 +1,5 @@
# From https://github.com/cliffordwolf/icestorm/blob/81c33a3/icefuzz/timings_hx8k.txt
1 1 316
2 1 316 379
3 1 316 379 400