Content module jhalfadder(sum,carry,a,b); output sum,carry; input a,b; assign sum = a^b; assign carry = a&b; endmodule module jfulladder(y,carryout,a,b,carryin); output y,carryout; input a,b,carryin; assign y = a ^ b ^ carryin; assign carryout = ( a & b ) | ( a & carryin ) | ( b & carryin ); endmodule // This takes two 4 bit numbers and outputs a 8 bit number // Reuses the half adder and full adder modules already existing // Look at array multiplier block diagram to understand the code module junsignedArrayMultiplier(PRODUCT, A, B); output [7:0] PRODUCT; input [3:0] A, B; wire [14:0] W; wire [10:0] C; wire [5:0] S; // Instantiate all the AND functions and and00 ( W[0], A[0], B[1] ); and and01 ( W[1], A[0], B[2] ); and and02 ( W[2], A[0], B[3] ); and and03 ( W[3], A[1], B[0] ); and and04 ( W[4], A[1], B[1] ); and and05 ( W[5], A[1], B[2] ); and and06 ( W[6], A[1], B[3] ); and and07 ( W[7], A[2], B[0] ); and and08 ( W[8], A[2], B[1] ); and and09 ( W[9], A[2], B[2] ); and and10 ( W[10], A[2], B[3] ); and and11 ( W[11], A[3], B[0] ); and and12 ( W[12], A[3], B[1] ); and and13 ( W[13], A[3], B[2] ); and and14 ( W[14], A[3], B[3] ); // LSB is calculated here and and15 ( PRODUCT[0], A[0], B[0] ); // First row // Bit 1 of the product as well jhalfadder jha01 ( PRODUCT[1], C[0], W[0], W[3] ); jfulladder jfa01 ( S[0], C[1], W[1], W[4], C[0] ); jfulladder jfa02 ( S[1], C[2], W[2], W[5], C[1] ); jhalfadder jha02 ( S[2], C[3], W[6], C[2] ); // Next row jhalfadder jha03 ( PRODUCT[2], C[4], W[7], S[0] ); jfulladder jfa03 ( S[3], C[5], W[8], S[1], C[4] ); jfulladder jfa04 ( S[4], C[6], W[9], S[2], C[5] ); jfulladder jfa05 ( S[5], C[7], W[10], C[3], C[6] ); // Next row jhalfadder jha04 ( PRODUCT[3], C[8], W[11], S[3] ); jfulladder jfa06 ( PRODUCT[4], C[9], W[12], S[4], C[8] ); jfulladder jfa07 ( PRODUCT[5], C[10], W[13], S[5], C[9] ); jfulladder jfa08 ( PRODUCT[6], PRODUCT[7], W[14], C[7], C[10] ); endmodule