openofdm/verilog/calc_mean.v

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2017-04-03 16:52:03 +00:00
module calc_mean
(
input clock,
input enable,
input reset,
input signed [15:0] a,
input signed [15:0] b,
input sign,
input input_strobe,
output reg signed [15:0] c,
output reg output_strobe
);
reg signed [15:0] aa;
reg signed [15:0] bb;
reg signed [15:0] cc;
reg [1:0] delay;
reg [1:0] sign_stage;
always @(posedge clock) begin
if (reset) begin
aa <= 0;
bb <= 0;
cc <= 0;
c <= 0;
output_strobe <= 0;
delay <= 0;
end else if (enable) begin
delay[0] <= input_strobe;
delay[1] <= delay[0];
output_strobe <= delay[1];
sign_stage[1] <= sign_stage[0];
sign_stage[0] <= sign;
aa <= a>>>1;
bb <= b>>>1;
cc <= aa + bb;
c <= sign_stage[1]? ~cc+1: cc;
end
end
endmodule