15
Chapter 3
Functional Details
Basic architecture
Figure shows a simplified block diagram of the PCI-DAS6030 and PCI-DAS6032. This board provides all of
the functional elements shown in the figure.
The System Timing and Control (STC) is the logical center for all DAQ, DIO, and DAC (if applicable)
operations. It communicates over two major busses: a local bus and a memory bus.
The local bus carries digital I/O data and software commands from the PCI Bus Master. There are two Direct
Memory Access (DMA) channels provided for data transfers to the PC.
Primarily, the memory bus carries A/D and D/A related data and commands. There are three buffer memories
provided on the memory bus:
The
queue buffer
(8K configuration memory) stores programmed channel numbers, gains, and offsets.
The
ADC buffer
(8K FIFO [First In, First Out]) temporarily stores scanned and converted analog inputs.
The
DAC 16K buffer
stores data to be output as analog waveforms.
Auxiliary input & output interface
The board's 100-pin I/O connector provides six software-selectable inputs, and three software-selectable
outputs. The signals are user-configurable clocks, triggers and gates.
Refer to "DAQ signal timing" on page 18 for information about these signals and their timing requirements.
The following table lists all of the possible signals and the default signals you use on the nine pins.
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