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PathDecoder2Way.v
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PathDecoder2Way.v
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//////////////////////////////////////////////////////////////////////////////////
// PathDecoder2Way.v
//
// The combinational logic or the forward north / forward south modules.
//
// For forward north:
// - ADD should be set to -1
// - dout_a goes to north out
// - dout_b goes to local
//
// For forward south:
// - ADD should be set to 1
// - dout_a goes to south out
// - dout_b goes to local
//////////////////////////////////////////////////////////////////////////////////
module PathDecoder2Way#(
parameter DATA_WIDTH = 23,
parameter DY_MSB = 20,
parameter DY_LSB = 12,
parameter ADD = 1
)(
input [DATA_WIDTH-1:0] din,
input wen,
output [DATA_WIDTH-1:0] dout_a,
output wen_a,
output [DATA_WIDTH-1-(DY_MSB-(DY_LSB-1)):0] dout_b,
output wen_b
);
wire signed [DY_MSB:DY_LSB] dy;
assign dy = din[DY_MSB:DY_LSB];
wire [DY_MSB:DY_LSB] dy_plus_add;
assign dy_plus_add = dy + ADD;
// assign dout_a = DATA_WIDTH-1 == DY_MSB ? {dy_plus_add, din[DY_LSB-1:0]} : {din[DATA_WIDTH-1:DY_MSB+1], dy_plus_add, din[DY_LSB-1:0]};
assign dout_a = {dy_plus_add, din[DY_LSB-1:0]};
assign wen_a = dy == 0 ? 0 : wen;
// assign dout_b = DATA_WIDTH-1 == DY_MSB ? din[DY_LSB-1:0] : {din[DATA_WIDTH-1:DY_MSB+1], din[DY_LSB-1:0]};
assign dout_b = din[DY_LSB-1:0];
assign wen_b = dy == 0 ? wen : 0;
endmodule