How to generate high frequency TTL pulse with NI usb-6501

Hello, i try to generate TTL pulse around 10 MHz with a Nuclear Instrument usb-6501. Actually,I tried with:

s = daq.createSession('ni'); 
s.addDigitalChannel('Dev1','port2/line7','OutputOnly');
for i = 1:10
     outputSingleScan(s,[1])
     pause(0.0000001)
     outputSingleScan(s,[0])
     pause(0.0000005);
end

But the output frequency is about 10 Hz. I look for the counter functionality in the Matlab drivers, but i don't find them. Could someone help me?

Thank you in advance,

Paul

[CHAO Zheng]

Hi，have you solved it？I have the same problem. Thank you！