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CARD-PCI/GX Hardware Manual
1.7 System interrupts
The causes of interrupts on SCE8720C are shown below:
Table 1.5 Causes of interrupts
Level
SMI
IRQ
IRQ interrupts are triggered by the 2 interrupt controllers (82C59 equivalent). The causes
of interrupts by interrupt controllers are shown below:
Table 1.6 Levels of interrupts by interrupt controller
Controller 1
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
*: SCE8720C has 2 serial ports and 1 parallel port built-in. Serial port interrupts are
selected from IRQ3, 4, 10 or 11, and parallel port interrupts are selected from IRQ5 or 7.
Interrupts not used by the built-in serial or parallel port can then be used with ISA
bus.
Also, when not using HDD, IRQ14 can be used with ISA bus.
14
Functions
External system management interrupt
Power management VSA
Interrupts by interrupt controller
Controller 2
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
Device
Timer out 0
Keyboard
Cascade connection from controller 2
Real time clock
Usable with ISA bus
Serial port (*)
Serial port (*)
Mouse
Co-Processor
HDD
Usable with ISA bus
Serial port 2 (*)
Serial port 1 (*)
Parallel port 2 (*)
FDD
Parallel port 1 (*)
EPSON
Rev.A
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