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Chapter 4
Theory of Operation
PCI Interface Circuitry
PCI-1200 User Manual
•
Digital I/O circuitry
•
Calibration circuitry
The internal data and control buses interconnect the components. The rest
of this chapter explains the theory of operation of each of the PCI-1200
components. Calibration circuitry is discussed in Chapter 5, Calibration.
The PCI-1200 interface circuitry consists of the MITE PCI interface chip
and a digital control logic chip. The MITE PCI interface chip provides a
mechanism for the PCI-1200 to communicate with the PCI bus. It is an
Application Specific Integrated Circuit (ASIC) designed by National
Instruments specifically for data acquisition. The digital control logic
chip connects the MITE PCI interface chip with the rest of the board.
The PCI-1200 is fully compliant with PCI Local Bus Specification,
Revision 2.0. Therefore, the base memory address and interrupt level for
the board are stored inside the MITE PCI interface chip at power on. You
do not need to set any switches or jumpers. The PCI bus is capable of 8-bit,
16-bit, or 32-bit transfers, but the PCI-1200 uses only 8-bit transfers.
Data/Address
37
Interface Control
6
Error Reporting
2
Arbitration
2
System
2
Interrupt
1
Address
5
Data
8
Control
MITE
PCI
4
Interface
Interrupt
Chip
1
DRQ
1
Figure 4-2. PCI Interface Circuitry
4-2
Digital
Control
Control/Data
Logic
© National Instruments Corporation
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