always @(posedge areset or posedge c0)
begin
if(areset)
    begin
            PhaseAcc = 2'h0;
            ResolutionCounter = 8'h00;
    end
else
begin

        case (PhaseAcc)
        2'b00:
        begin
        DAC_Data    <= SinRom[ResolutionCounter];
        end
        2'b01:
        begin
        DAC_Data    <= SinRom[63 - ResolutionCounter];
        end
        2'b10:
        begin
        DAC_Data    <= SinRom[63 - ResolutionCounter] - 127;
        end
        2'b11:
        begin
        DAC_Data    <= 254 - SinRom[63 - ResolutionCounter];
        end
        endcase
        ResolutionCounter <= ResolutionCounter + STEP;

    if (ResolutionCounter == 64)
        begin
        PhaseAcc <= (PhaseAcc == 2'b11) ? 2'b00 : PhaseAcc + 2'b01;
        ResolutionCounter <= 8'h00;
        end

end
end

assign DAC = DAC_Data;