Which RTSI Pin Carries the Master Clock when Synchronizing Multiple PCI DSA Boards?Hardware: Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA)>>PCI-4461
Problem: I am using one or more PCI Dynamic Signal Acquisition (DSA) devices. I can use the RTSI bus to synchronize operations across devices. However, I would like to use another device to access the Master Clock signal on the RTSI bus. Which RTSI line carries the signal? Solution: The image below illustrates the RTSI line that carries the signal. The orientation of this picture assumes you are looking head-on at the RTSI bus on a DSA device that has been physically installed in the machine. The IO pins on the board are to the left side of the diagram.
The signal carried on this line is generally 128 or 256 times the actual sample rate. For most sample rates, this puts the master clock in the MHz range. Most other devices with a RTSI bus connection cannot import this signal, including E Series MIO devices, M Series DAQ devices, and TIO counter/timer devices. NI does not recommend using clips other similar connections to pull this signal from the board to use for external timing, as signal integrity problems may arise when using such methods to route high frequency clocks. Refer to the Related Links section for information on how you can synchronize your DSA boards with devices which cannot access the Master Clock. Related Links: KnowledgeBase 3EE7N2NQ: Synchronization with Dynamic Signal Acquisition (DSA) Products with DAQmx Attachments: 
Report Date: 02/20/2004 Last Updated: 03/03/2009 Document ID: 36JDIT2L |
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