File size: 2,244 Bytes
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 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | /*
Instruction memory takes in two inputs: A 32-bit Program counter and a 1-bit reset.
The memory is initialized when reset is 1.
When reset is set to 0, Based on the value of PC, corresponding 32-bit Instruction code is output
*/
module INST_MEM(
input [31:0] PC,
input reset,
output [31:0] Instruction_Code
);
reg [7:0] Memory [31:0]; // Byte addressable memory with 32 locations
// Under normal operation (reset = 0), we assign the instr. code, based on PC
assign Instruction_Code = {Memory[PC+3],Memory[PC+2],Memory[PC+1],Memory[PC]};
// Initializing memory when reset is one
always @(reset)
begin
if(reset == 1)
begin
// Setting 32-bit instruction: add t1, s0,s1 => 0x00940333
Memory[3] = 8'h00;
Memory[2] = 8'h94;
Memory[1] = 8'h03;
Memory[0] = 8'h33;
// Setting 32-bit instruction: sub t2, s2, s3 => 0x413903b3
Memory[7] = 8'h41;
Memory[6] = 8'h39;
Memory[5] = 8'h03;
Memory[4] = 8'hb3;
// Setting 32-bit instruction: mul t0, s4, s5 => 0x035a02b3
Memory[11] = 8'h03;
Memory[10] = 8'h5a;
Memory[9] = 8'h02;
Memory[8] = 8'hb3;
// Setting 32-bit instruction: xor t3, s6, s7 => 0x017b4e33
Memory[15] = 8'h01;
Memory[14] = 8'h7b;
Memory[13] = 8'h4e;
Memory[12] = 8'h33;
// Setting 32-bit instruction: sll t4, s8, s9
Memory[19] = 8'h01;
Memory[18] = 8'h9c;
Memory[17] = 8'h1e;
Memory[16] = 8'hb3;
// Setting 32-bit instruction: srl t5, s10, s11
Memory[23] = 8'h01;
Memory[22] = 8'hbd;
Memory[21] = 8'h5f;
Memory[20] = 8'h33;
// Setting 32-bit instruction: and t6, a2, a3
Memory[27] = 8'h00;
Memory[26] = 8'hd6;
Memory[25] = 8'h7f;
Memory[24] = 8'hb3;
// Setting 32-bit instruction: or a7, a4, a5
Memory[31] = 8'h00;
Memory[30] = 8'hf7;
Memory[29] = 8'h68;
Memory[28] = 8'hb3;
end
end
endmodule |