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55acfed | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | /*
The instruction fetch unit has clock and reset pins as input and 32-bit instruction code as output.
Internally the block has Instruction Memory, Program Counter(P.C) and an adder to increment counter by 4,
on every positive clock edge.
*/
`include "INST_MEM.v"
module IFU(
input clock,reset,
output [31:0] Instruction_Code
);
reg [31:0] PC = 32'b0; // 32-bit program counter is initialized to zero
// Initializing the instruction memory block
INST_MEM instr_mem(PC,reset,Instruction_Code);
always @(posedge clock, posedge reset)
begin
if(reset == 1) //If reset is one, clear the program counter
PC <= 0;
else
PC <= PC+4; // Increment program counter on positive clock edge
end
endmodule |