module core_tb_imem
#(
  parameter ADDR_WIDTH = 32
)
(
  input  logic        clk,

  // Fetch Interface
  input  logic [31:0] if_imem_addr_IF,

  // Decode Interface
  output logic [31:0] imem_id_instr_ID
);

int assembly_file;
int status_file;
int error_file;
string error_message_file;

logic [7:0] imem [0:(1<<(ADDR_WIDTH))-1];

// Fill up memory using the $fopen and $fread syscalls
initial begin
  assembly_file = $fopen("../../../core/testcode/riscv_arithmetic_basic_test_0.bin", "rb");
  status_file   = $fread( imem, assembly_file );
  if (status_file == 0) begin
    $ferror( assembly_file, error_message_file );
    $error("File I/O Error %s", error_message_file);
  end
  $display("Memory Contents Initialized");
end

// Memory reads, TODO: Should we add a RMASK
always_ff @ (posedge clk) begin
  imem_id_instr_ID[7:0]   <= imem[if_imem_addr_IF[ADDR_WIDTH-1:0]+0]; // 4 bytes read into a single word in RISC-V
  imem_id_instr_ID[15:8]  <= imem[if_imem_addr_IF[ADDR_WIDTH-1:0]+1]; // 4 bytes read into a single word in RISC-V
  imem_id_instr_ID[23:16] <= imem[if_imem_addr_IF[ADDR_WIDTH-1:0]+2]; // 4 bytes read into a single word in RISC-V
  imem_id_instr_ID[31:24] <= imem[if_imem_addr_IF[ADDR_WIDTH-1:0]+3]; // 4 bytes read into a single word in RISC-V
end

endmodule