am I able to parallel 2xPCI-6541 cards to create a 64 channel system?

[innovision]

I am using 2xPCI 6541 DIO cards to create a 64 bit wide system, however I am having problems activating the cards at exactly the same time - I see a 60 - 100 ms delay between the appearence of data betwen the two cards. 

Is it possible to synchronise the cards to work together with no time delay between data generation or aquisition?

[Ryan_M]

Innovision,

The 6541 is an SMC based HSDIO device which supports TCLK synchronization allowing for subsample board to board synchronization.  Here are some general references for NI TCLK.

NI TCLK app note: http://zone.ni.com/devzone/cda/tut/p/id/3675

NI TCLK help file : http://zone.ni.com/reference/en-XX/help/370592E-01/nitclk/ni_tclk_help/

HSDIO TCLK Example : http://zone.ni.com/devzone/cda/epd/p/id/6340

TCLK Knowledge Base : http://digital.ni.com/public.nsf/allkb/100DFE0FBDAE4F9986257323006A4180

Additionally, NI HSDIO ships with examples illustrating how to TCLK synchronize multiple devices. In LabVIEW you can refer to the example finder under :

Hardware Input and Output >> Modular Instruments >> HI-HSDIO >> Synchronization

Also, since you're using PCI devices, you need to make sure you connect the devices with a RTSI cable and setup the devices in MAX to reference that RTSI cable.  TCLK uses RTSI to calibrate out board to board skew and to trigger all devices.