96-Bit Parallel Digital I/O Interface User Manual

Chapter 4 Theory of Operation
PCI-DIO-96 User Manual 4-2 © National Instruments Corporation
Figure 4-1. PCI-DIO-96 Block Diagram
PCI Interface Circuitry
The PCI-DIO-96 uses the MITE ASIC to communicate with the PCI
bus. The MITE ASIC was designed by National Instruments
specifically for data acquisition. The PCI-DIO-96 is fully compliant
with Local Bus Specification 2.0.
The base memory address and interrupt level for the board are stored
inside the MITE at power on. You do not need to set any switches or
jumpers.
I/O Connector
Interrupt
Control
Circuitry
Port A
Port B
Port C
Port A
Port B
Port C
Port A
Port B
Port C
Port A
Port B
Port C
8
8
8
8
8
8
8
8
8
8
8
8
MITE
PCI
Interface
Circuitry
Interrupt
1
Data
Bus
Interrupt
Bus
Interrupt
PCI
1 A Fuse
+5 VDC
System
2
Arbitration
2
Error Reporting
2
Interface Control
6
Data/Address
37
82C53
Timer
82C55A
PPI C
82C55A
PPI D
82C55A
PPI B
82C55A
PPI A