National Instruments PCI-1200 Instrukcja Użytkownika Strona 53

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© 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
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