supleed2/cordic
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Further adjust bit offsets, improve accuracy from 1.34601 to 0.455326

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Aadi Desai 2023-05-30 13:49:23 +01:00
parent 8d276e71a4
commit bbf9bf3f0c
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2 changed files with 9 additions and 4 deletions
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2
cordic.sv
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@ -62,7 +62,7 @@ end
/* verilator lint_on ALWCOMBORDER */
always_comb
if (i_qph > 16'd65508) o_sin = 16'hFFFF;
if (i_qph > 16'd65508) o_sin = 16'hFFFE;
else if (i_qph < 16'd32) o_sin = i_qph + (i_qph >> 1);
else o_sin = y[19][17:2];

11
saw2sin.sv
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@ -22,8 +22,13 @@ cordic cordic
, .o_sin (qsin)
);
always_comb o_sin = invert
? ~{1'b1, qsin[15:1]} + 1 // Invert
: {1'b1, qsin[15:1]}; // Normal
logic [16:0] sin;
always_comb sin = reverse
? (invert ? ~{1'b1, qsin[15:0]} // Reverse, Invert
: {1'b1, qsin[15:0]} + 17'd1) // Reverse, Normal
: (invert ? ~{1'b1, qsin[15:0]} + 17'd2 // Normal, Invert
: {1'b1, qsin[15:0]} + 17'd0); // Normal, Normal
always_comb o_sin = sin[16:1];
endmodule