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minor progress in mapping

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This commit is contained in:
Artur Swiderski 2020-10-28 00:25:57 +01:00
parent 309689da5b
commit 53a95de62f
3 changed files with 21 additions and 14 deletions
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17
techlibs/intel_le/common/arith_le_map.v
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@ -40,7 +40,7 @@ generate
end else begin
MISTRAL_ALUT_ARITH #(
.LUT(16'b1010_1010_1010_1010), // Q = A
) alm_start (
) le_start (
.A(CI), .B(1'b1), .C(1'b1), .D0(1'b1), .D1(1'b1),
.CI(1'b0),
.SO(),
@ -52,20 +52,25 @@ endgenerate
// Carry chain
genvar i;
generate for (i = 0; i < Y_WIDTH; i = i + 1) begin:slice
// TODO: mwk suggests that a pass could merge pre-adder logic into this.
MISTRAL_ALUT_ARITH #(
.LUT(16'b0110_0110_0110_0110) // Q = A ? ~B : B
) alm_i (
) le_not_i (
.A(BI), .B(BX[i]), .C(1'b0), .D(1'b0),
.CI(1'b0),
.SO(BTOADDER[i]),
.CO()
);
MISTRAL_ALUT_ARITH #(
.LUT(16'b1010_1010_1010_1010), // SUM = A xor B xor CI
.LUT(16'b1001_0110_1110_1000), // SUM = A xor B xor CI
// CARRYi+1 = A and B or A and CI or B and CI
.sum_lutc_input("cin")
) alm_start (
//.sum_lutc_input("cin")
) le_i (
.A(AA[i]), .B(BTOADDER[i]), .C(1'b1), .D(1'b1),
.CI(LE_CARRY[i]),
.SO(Y[i]),

11
techlibs/intel_le/common/le_sim.v
View file

@ -234,7 +234,7 @@ endmodule
module MISTRAL_ALUT_ARITH(input A, B, C, D, (* abc9_carry *) input CI, output SO, (* abc9_carry *) output CO);
parameter LUT = 16'h0000;
parameter sum_lutc_input = "cin";
//parameter sum_lutc_input = "cin";
`ifdef cycloneiv
specify
(A => SO) = 1342;
@ -253,10 +253,13 @@ endspecify
wire q0, q1;
assign q0 = LUT >> sum_lutc_input == "cin" ? {D, CI, B, A}:{D, C, B, A};
assign q1 = LUT >> sum_lutc_input == "cin" ? {'b1, CI, B, A}:{'b1, C, B, A};
//assign q0 = LUT >> sum_lutc_input == "cin" ? {D, CI, B, A}:{D, C, B, A};
//assign q1 = LUT >> sum_lutc_input == "cin" ? {'b0, CI, B, A}:{'b0, C, B, A};
assign SO = D ? q1 : q0;
assign q0 = LUT >> {'b0, CI, B, A};
assign q1 = LUT >> {D, CI, B, A};
assign SO = q1;
assign CO = q0;