Constant Unit

`timescale 1ns / 1ps

// in the DECODER AND OPERAND FETCH phase
// extends the IMMEDIATE from 15 bit to 32 bit

// depending on CS bit, extends the sign bit (not sure which, COME BACK AND FIND OUT!!)


module Constant_unit(
                    input [14:0] IM,
                    input CS,
                    output reg [31:0] CONST_DATA
                    );


always@(*) begin
    CONST_DATA = IM;
    CONST_DATA[31] = (CS)? IM[14]: 0 ;  // in tables, CS = 1 for sign extended IM
end

endmodule