National Instruments 6508 PCI-DIO-96 - Manual (Page 36)

Chapter 4 Theory of Operation
PCI-DIO-96 User Manual 4-4 © National Instruments Corporation
The block diagram in Figure 4-2 illustrates the PCI-DIO-96 interrupt
control circuitry.
Figure 4-2. PCI-DIO-96 Interrupt Control Circuitry Block Diagram
CLK0
GATE0
OUT0
CLK1
GATE1
OUT1
CLK2
GATE2
OUT2
2 MHz
+5 V
+5 V
82C55A
PPI A
82C55A
PPI B
82C55A
PPI D
82C55A
PPI C
PCI
Interrupt
PC3
PC0
PC3
PC0
PC3
PC0
82C53
Counter/Timer
PC3
PC0
Interrupt
Control
Circuitry
PCI-DIO-96
Interrupt Control Registers