Add saw2sin.sv

Handles inversion and reversing to create full sine wave from quarter wave
This commit is contained in:
Aadi Desai 2023-05-28 16:04:18 +01:00
parent e00149bb62
commit 44e148de38
Signed by: supleed2
SSH key fingerprint: SHA256:CkbNRs0yVzXEiUp2zd0PSxsfRUMFF9bLlKXtE1xEbKM

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saw2sin.sv Normal file
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`default_nettype none
module saw2sin
( input var [15:0] i_saw
, output var [15:0] o_sin
);
logic invert;
always_comb invert = i_saw[15];
logic reverse;
always_comb reverse = i_saw[14];
logic [15:0] qsaw;
always_comb qsaw = reverse
? {~i_saw[13:0], 2'b01} // Reverse
: {i_saw[13:0], 2'b00}; // Normal
logic [15:0] qsin;
cordic cordic
( .i_qph (qsaw)
, .o_sin (qsin)
);
always_comb o_sin = invert
? ~{1'b1, qsin[15:1]} + 1 // Invert
: {1'b1, qsin[15:1]}; // Normal
endmodule