Fundadero,
Your PCI-6229 does support change detection, however it only supports it for the lines on port 0. While you can't directly use port 0 to get a timestamp, I believe there is a way you can do this, though it requires some creative thinking.
The idea is this:
1) You use a digital input task with change detection timing. In hardware, there is an event which is generated each time a detected change occurs.
2) You use a counter input task to measure the time between these change detection events. To do this, I believe you'd want to setup an 'edge count' task. This task would count the number of of edges of signal of known frequency (the 20 Mhz or 80 Mhz timebase on your 6229). You would then use the change detection event as a sample clock for this task. Essentially, each time port 0 detects a change, your counter would record the number of edges of the timebase that have occurred. This should allow you to use one of your counters to effectively timestamp changes in the signal. I thought that there was an example of this posted somewhere, however I can't seem to find it. If this is an avenue you'd like to pursue, let me know and I will see if I can provide more guidance, or find an example implementation.
Dan
