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// nandgame arithmetic unit
`timescale 1us/1us
`include "nandgame_types.v"
`ifndef NANDGAME_ARU
`define NANDGAME_ARU
module arith_unit #(
parameter DATA_WIDTH = 16
) (
// first operand
input wire [(DATA_WIDTH-1):0] X_in,
// second operand
input wire [(DATA_WIDTH-1):0] Y_in,
// opcode, see ArithCode
input wire ArithCode arith_operation_in,
// result of operation
output logic [(DATA_WIDTH-1):0] result_out
);
always_comb begin
case (arith_operation_in)
ARITH_PLUS: result_out = X_in + Y_in;
ARITH_MINUS: result_out = X_in - Y_in;
ARITH_INC: result_out = X_in + 1;
ARITH_DEC: result_out = X_in - 1;
default: result_out = 0;
endcase
end
endmodule
`endif
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