Pc Card I/O Channel Interface Circuitry; Timing Circuitry; Analog Input Circuitry; Analog Output Circuitry - National Instruments DAQCard-1200 User Manual

Chapter 4 Theory of Operation

PC Card I/O Channel Interface Circuitry

Address Bus
Control Lines
Data Bus
IRQ
DAQCard-1200 User Manual
The major components of the DAQCard-1200 are as follows:
• PC Card I/O channel interface circuitry
•

Analog input circuitry

•

Analog output circuitry

•

Digital I/O circuitry

•

Timing circuitry

• Calibration circuitry
The internal data and control buses interconnect the components. The rest
of the chapter explains the theory of operation of each of the
DAQCard-1200 components.
The PC Card I/O channel interface circuitry consists of an address bus, a
data bus, interrupt lines, and several control and support signals. Figure 4-2
shows the components making up the DAQCard-1200 PC Card I/O channel
interface circuitry.
Timing
Interface
Data
Buffers
Interrupt
Control

Figure 4-2. PC Card I/O Interface Circuitry Block Diagram

Address
Decoder
Card
Information
Structure
PCMCIA
Control
Registers
4-2
Register Selects
Read and Write Signals
Internal Data Bus
Interrupt Requests
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