//`define USE_BRAM
`ifdef USE_BRAM
    // put code in a pre-loaded block ram
    reg [7:0] rom_mem[511:0];
	reg [7:0] rom_do;
	initial
        $readmemh("../src/rom_512.hex",rom_mem);
	always @(posedge clk)
		rom_do <= rom_mem[CPU_AB[8:0]];
`else
    // simulate a BRAM with luts
	reg [7:0] rom_do;
    always @(posedge clk)
        case(CPU_AB[8:0])
            9'h000: rom_do <= 8'ha2;
            9'h001: rom_do <= 8'h00;
            9'h002: rom_do <= 8'h8e;
            9'h003: rom_do <= 8'h00;
            9'h004: rom_do <= 8'h10;
            9'h005: rom_do <= 8'he8;
            9'h006: rom_do <= 8'h4c;
            9'h007: rom_do <= 8'h02;
            9'h008: rom_do <= 8'hfe;
            9'h1fc: rom_do <= 8'h00;
            9'h1fd: rom_do <= 8'hfe;
            default: rom_do <= 8'hea;
        endcase
`endif