National Instruments PCI-1200 - Manual (Page 53)

© National Instruments Corporation 4-1 PCI-1200 User Manual
4
Theory of Operation
This chapter explains the operation of each functional unit of the PCI-1200.
Functional Overview
The block diagram in Figure 4-1 shows a functional overview of the
PCI-1200 board.
Figure 4-1. PCI-1200 Block Diagram
The major components of the PCI-1200 are as follows:
• MITE PCI interface circuitry
• Timing circuitry
• Analog input circuitry
• Analog output circuitry
12
3
12
8
16 8
8
12
1
24
I/O Connector
PCI Bus
Dither
Calibration
4
4
1 MHz
Timebase
10 MHz
Oscillator
Time
Divider
2 MHz
Timebase
Digital
Control
Logic MITE
PCI
Interface
Chip 82C53
Ctr/Timer
Group A
82C55A
Digital
Interface
82C53
Ctr/Timer
Group B
12-Bit
D/A
12-Bit
D/A
Pgm
Gain 12-Bit
A/D
FIFO
Input
Mux
Data/Address
Interface Control
Error Reporting
Arbitration
System
Interrupt
1
2
2
2
6
37
Address
Data
Control
Interrupt
DRQ
1
1
4
8
5
1