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`timescale 1ns/1ps module mult_piped_8x8_2sC(a,b,clk,reset,y); input [7:0]a,b; input clk,reset; output [15:0] y; reg[7:0] aR [8:0]; reg[7:0] bR [8:0]; reg[15:0]yR [8:0]; always@(posedge clk) begin aR[7] = aR[6]; bR[7] = bR[6]; yR[7] = yR[6]; aR[6] = aR[5]; bR[6] = bR[5]; yR[6] = yR[5]; aR[5] = aR[4]; bR[5] = bR[4]; yR[5] = yR[4]; aR[4] = aR[3]; bR[4] = bR[3]; yR[4] = yR[3]; aR[3] = aR[2]; bR[3] = bR[2]; yR[3] = yR[2]; aR[2] = aR[1]; bR[2] = bR[1]; yR[2] = yR[1]; aR[1] = aR[0]; bR[1] = bR[0]; yR[1] = yR[0]; //muliply result (a*b) appears after +clk aR[0] =a; bR[0] =b; yR[0] =multiply_8x8_2sC (aR[0],bR[0]); end function[15:0] multiply_8x8_2sC; input [7:0] a,b; reg [7:0] a_mag,b_mag; reg [14:0] Y_mag; reg [14:0] Y_neg; begin case (a[7]) 0:a_mag = a[6:0]; 1:a_mag =128-a[6:0]; endcase case (b[7]) 0:b_mag = b[6:0]; 1:b_mag =128-b[6:0]; endcase Y_mag=a_mag*b_mag; if((a[7]^b[7])&(Y_mag!=0)) begin Y_neg=32768-Y_mag[13:0]; multiply_8x8_2sC={1'b1,Y_neg}; end else multiply_8x8_2sC=Y_mag; end endfunction assign y=yR[7]; endmodule
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