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ecp5: remove small LUT entries

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This commit is contained in:
Eddie Hung 2020-02-13 09:50:17 -08:00
parent 0ed550d83c
commit d2284715fa
1 changed files with 6 additions and 24 deletions
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30
techlibs/ecp5/cells_sim.v
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@ -15,30 +15,8 @@ module LUT4(input A, B, C, D, output Z);
endspecify endspecify
endmodule endmodule
(* abc9_lut=1 *) // This is a placeholder for ABC9 to extract the area/delay
module \$__ABC9_LUT1 (input A, output Z); // cost of 5-input LUTs and is not intended to be instantiated
specify
(A => Z) = 141;
endspecify
endmodule
(* abc9_lut=1 *)
module \$__ABC9_LUT2 (input A, B, output Z);
specify
(A => Z) = 141;
(B => Z) = 275;
endspecify
endmodule
(* abc9_lut=1 *)
module \$__ABC9_LUT3 (input A, B, C, output Z);
specify
(A => Z) = 141;
(B => Z) = 275;
(C => Z) = 379;
endspecify
endmodule
// LUT5 = 2x LUT4 + PFUMX // LUT5 = 2x LUT4 + PFUMX
(* abc9_lut=2 *) (* abc9_lut=2 *)
module \$__ABC9_LUT5 (input M0, D, C, B, A, output Z); module \$__ABC9_LUT5 (input M0, D, C, B, A, output Z);
@ -51,6 +29,8 @@ module \$__ABC9_LUT5 (input M0, D, C, B, A, output Z);
endspecify endspecify
endmodule endmodule
// This is a placeholder for ABC9 to extract the area/delay
// of 6-input LUTs and is not intended to be instantiated
// LUT6 = 2x LUT5 + MUX2 // LUT6 = 2x LUT5 + MUX2
(* abc9_lut=4 *) (* abc9_lut=4 *)
module \$__ABC9_LUT6 (input M1, M0, D, C, B, A, output Z); module \$__ABC9_LUT6 (input M1, M0, D, C, B, A, output Z);
@ -64,6 +44,8 @@ module \$__ABC9_LUT6 (input M1, M0, D, C, B, A, output Z);
endspecify endspecify
endmodule endmodule
// This is a placeholder for ABC9 to extract the area/delay
// of 7-input LUTs and is not intended to be instantiated
// LUT7 = 2x LUT6 + MUX2 // LUT7 = 2x LUT6 + MUX2
(* abc9_lut=8 *) (* abc9_lut=8 *)
module \$__ABC9_LUT7 (input M2, M1, M0, D, C, B, A, output Z); module \$__ABC9_LUT7 (input M2, M1, M0, D, C, B, A, output Z);