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Chapter 3
Theory of Operation
This chapter explains the basic operation of the PC-TIO-10 circuitry.
The block diagram in Figure 3-1 illustrates the key functional components of the PC-TIO-10
board.
1-MHz and
5-MHz
Clocks
8
Transceiver
PC I/O
21
Channel
Control
Interrupt
6
Control
Circuitry
+5 VDC
The PC I/O channel consists of an address bus, a data bus, a DMA arbitration bus, interrupt lines,
and several control and support signals.
© National Instruments Corporation
Data
Figure 3-1. PC-TIO-10 Block Diagram
AMD
Am9513A
STC A
AMD
Am9513A
STC B
Motorola
MC6821
PIA
1A Fuse
3-1
GATE
5
SOURCE
4
OUT
6
GATE
5
SOURCE
4
OUT
6
Port A
8
Port B
8
EXTIRQ
2
PC-TIO-10 User Manual
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