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substractor4.v
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module substractor4 #(parameter BITWIDTH = 4) (A, B, Ci, S, Co);
// Input and Output Declarations
input [BITWIDTH-1:0] A; // A is an input of size BITWIDTH
input [BITWIDTH-1:0] B; // B is an input of size BITWIDTH
input Ci; // Carry-in (used for borrow)
output [BITWIDTH-1:0] S; // S is an output of size BITWIDTH
output Co; // Carry-out (borrow-out)
// Internal Wire Declaration
wire [BITWIDTH:0] Diff; // Difference wire (one extra bit for borrow)
// Assign Statements for Subtraction
assign Diff = A - B - Ci; // Calculate the difference
assign S = Diff[BITWIDTH-1:0]; // Assign the lower BITWIDTH bits to S
assign Co = Diff[BITWIDTH]; // Assign the borrow-out
endmodule

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