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This appendix contains a list of commonly asked questions and their 
answers relating to usage and special features of your 611X E board.

What is the 611X E board?

The 611X E board is a switchless and jumperless enhanced MIO board 
that uses the DAQ-STC for timing.

The DAQ-STC is the system timing control application-specific 
integrated circuit (ASIC) designed by National Instruments and is the 
backbone of the 611X E board. The DAQ-STC contains seven 24-bit 
counters and three 16-bit counters. The counters are divided into the 
following three groups: 

•

Analog input—two 24-bit, two 16-bit counters

•

Analog output—three 24-bit, one 16-bit counters

•

General-purpose counter/timer functions—two 24-bit counters

The groups can be configured independently with timing resolutions of 
50 ns or 10 µs. With the DAQ-STC, you can interconnect a wide variety 
of internal timing signals to other internal blocks. The interconnection 
scheme is quite flexible and completely software configurable. New 
capabilities such as buffered pulse generation, equivalent time 
sampling, and seamlessly changing the sampling rate are possible.

It means that this is the fastest you can acquire data on your board and 
still achieve accurate results. The 611X E board has a sampling rate of 
5 MS/s. This sampling rate is at 5 MS/s regardless if 1 or 4 channels are 
acquiring data.

PCI_E.book  Page 1  Thursday, June 25, 1998  12:55 PM