PCI-6534 internal clock

[Lei Dai]

I need two separate clock signals to be synchronized, one at 10MHz, the other at 2.5MHz. I was wondering if it is possible to derive (in LabVIEW) the slower signal from the 6534's internal clock when it's set to run at the faster speed. If not, can the 6534's two internal clocks be set to run at different speeds yet still run in sync?

Thanks for your help.

[Labviewguru]

First, you need to create a timing diagram to sort out your signals.

I would suggest consulting the manual for the device to determine if it can internally output two separate rates as you require. If not, then you can synchronize them with external hardware. I strongly suspect that you can in fact synchronize the clocks. Otherwise, external division can be used.

[bman]

Lei Dai

LabVIEW Guru is correct. The 6534 can use seperate clock speeds for the two different groups. The available rates are 20 MHz / integer. So both 10 and 2.5 MHz will work.

There are also several ways to synchronize the clocks. One would be to route the RTSI clock to the board clock, (this would basically disable the clock), then start your application, then reroute the board clock to itself to start both groups at the same time. Another way would be to just have both groups trigger of the same signal.

If it turns out you need a rate that is not a divisor of 20 MHz, I would suggest using a 6602 board to create the clock signals.

Brian