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module round_sd
#(parameter WIDTH_IN=18,
parameter WIDTH_OUT=16,
parameter DISABLE_SD=0)
(input clk, input reset,
input [WIDTH_IN-1:0] in, input strobe_in,
output reg [WIDTH_OUT-1:0] out, output reg strobe_out);
localparam ERR_WIDTH = WIDTH_IN - WIDTH_OUT + 1;
wire [ERR_WIDTH-1:0] err;
wire [WIDTH_IN-1:0] err_ext, sum;
wire [WIDTH_OUT-1:0] out_pre;
wire strobe_pre;
sign_extend #(.bits_in(ERR_WIDTH),.bits_out(WIDTH_IN)) ext_err (.in(err), .out(err_ext));
add2_and_clip_reg #(.WIDTH(WIDTH_IN)) add2_and_clip_reg
(.clk(clk), .rst(reset), .in1(in), .in2((DISABLE_SD == 0) ? err_ext : 0), .strobe_in(strobe_in), .sum(sum), .strobe_out(strobe_pre));
round #(.bits_in(WIDTH_IN),.bits_out(WIDTH_OUT)) round_sum (.in(sum), .out(out_pre), .err(err));
always @(posedge clk)
begin
strobe_out <= strobe_pre;
if(strobe_pre)
out <= out_pre;
end
endmodule // round_sd
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