PCI
BUS
CONTROL
LOGIC
INTERRUPT
ENABLE
PPI
GROUP
1
PPI
GROUP
0
CHANGE
OF
STATE
DETECT
CHANGE
OF
STATE
DETECT
CHANGE
OF
STATE
INTERRUPT
APPLIES TO “S”
CARDS ONLY
CHANGE OF STATE INTERRUPT
EXTERNAL INTERRUPT
C
O
M
P
U
T
E
R
PC
I BU
S
I/O
B
U
F
F
E
R
S
1
0
0
P
I
N
C
O
N
N
E
C
T
O
R
PORT A
PORT B
PORT C HI
PORT C LO
PORT A
PORT B
PORT C HI
PORT C LO
Figure 1-1: Block Diagram
Manual PCI-DIO-48 H/HS
7
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