send bit to parallel port

[BENIO]

Hello LV community,

I am sending bits to my parallel port to communicate with my ASIC but I have an issue to enter some test modes which require to send simultanously for example 3 bits at the same time into 3 pins  to the port, I can seen from the scope that there are some delays between them (aprox.20 us).

My question is, this delays is it due to the PC performance or the way to send them? I am using the Out Port8.via for thi purpose. Is there any solution for this issue?

Thx

[JorisV]

Hi, I don't really know your program but maybe you a better of with a Digital I/O board to avoid these delays. Most people use these boards to control there parallel port at high speed by directly accessing the pins. Don't forget that when you are using Port In and Port Out that you are still using software calls and you are dependant on PC performance. Regards. JorisV