Chapter 4 Functional Details; Basic Architecture; Auxiliary Input & Output Interface - Measurement Computing PCI-DAS6013 User Manual

Functional Details

Basic architecture

Figure 4-1 is a simplified block diagram of the PCI-DAS6013 and PCI-DAS6014. These
boards provide 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 (PCI-DAS6014 only) 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 (this buffer
function only applies to the PCI-DAS6014).
Auxiliary input & output interface
Each 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 the
signals and their timing requirements.
Table 4-4 lists all of the possible and the default signals you use on the nine pins. D/A
signals pertain only to the PCI-DAS6014.
"DAQ signal timing" section on page 4-4 for more explanation of these
4-1
Chapter 4