2-1
2
Functional Description
This section describes the features and operating characteristics of
PIO-SSR Series boards. Figure 2-1 shows a block diagram of a
PIO-SSR-24; Figure 2 -2 shows a block diagram of a PIO-SSR-48;
Figure 2-3 shows a block diagram of a PIO-SSR-120.
A0 to A7
B0 to B7
C4 to C7
C0 to C3
J1
I/O Mode
Selector
Address
Decoder
Data
Bus
Buffer
Data Bus
I/O
Control
Circuit
Control
Bus
Buffer
IRQ
Control
Circuit
IRQ
3 to 7
9 to 12
14, 15
SA4
to
SA0
RESET
IOW
IOR
D7 to D0
SA15
to
SA5
Figure 2-1. Block Diagram of a PIO-SSR-24
Control Bus
C0 and C3
J1 Data Buffer
Port A
Port B
Port C
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