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Chapter 4
Theory of Operation
PCI Interface Circuitry
NI PCI-1200 User Manual
•
DIO circuitry
•
Calibration circuitry
The internal data and control buses interconnect the components. The rest
of this chapter explains the theory of operation of each NI PCI-1200
components. Calibration circuitry is discussed in Chapter 5, Calibration.
The NI 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 NI PCI-1200 to communicate with the PCI bus. It is an
Application Specific Integrated Circuit (ASIC) designed by NI specifically
for data acquisition. The digital control logic chip connects the MITE PCI
interface chip with the rest of the device. The NI PCI-1200 is fully
compliant with PCI Local Bus Specification, Revision 2.2. Therefore, the
base memory address and interrupt level for the device 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 NI 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
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