microwatt/asic/behavioural/RAM512.v

module RAM512 #(
    parameter BITS=9,
    parameter FILENAME="firmware.hex"
) (
`ifdef USE_POWER_PINS
    inout VPWR,
    inout VGND,
`endif
    input CLK,
    input [7:0] WE0,
    input EN0,
    input [63:0] Di0,
    output reg [63:0] Do0,
    input [BITS-1:0] A0
);

    reg [63:0] RAM[2**BITS-1:0];

    always @(posedge CLK) begin
        if (EN0)
            Do0 <= RAM[A0];
        else
            Do0 <= 64'b0;
    end

    generate
        genvar i;
        for (i=0; i<8; i=i+1) begin: BYTE
            always @(posedge CLK) begin
                if (EN0) begin
                    if (WE0[i])
                        RAM[A0][i*8+7:i*8] <= Di0[i*8+7:i*8];
                end
            end
        end
    endgenerate

initial begin
    $readmemh(FILENAME, RAM);
end

endmodule