?? instruction_memory.v
字號(hào):
module instruction_memory(clk, instruction, addr, read, enable); //it's a rom, output 4 sequential bytes beginning at address of addr
input clk;
input[31:0] addr;
input read, enable;
output reg [31:0] instruction;
reg [7:0] memory[8'b11111111-1:0];
initial
begin
{memory[3],memory[2],memory[1],memory[0]} = 32'b00000010010100111000100000100000; //the instruction means: add $17, $18, $19 #$17 = $ 18 + $19
end
always @(posedge clk)
begin
instruction[7:0] <= (read && enable) ? memory[addr] : 8'bzzzzzzzz;
instruction[15:8] <= (read && enable) ? memory[addr+1] : 8'bzzzzzzzz;
instruction[23:16] <= (read && enable) ? memory[addr+2] : 8'bzzzzzzzz;
instruction[31:24] <= (read && enable) ? memory[addr+3] : 8'bzzzzzzzz;
end
endmodule
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