ETX-EV133
User’s Manual
Page 18
7
System Resources
7.1
Interrupt Assignment
PCI and ISA interrupts supported by the VIA VT82C686B South Bridge are as follows:
ISA IRQ
Edge/ Level
Polarity
Interrupt Source
Notes
NMI
Edge
High
SERR_L asserted
SMI
Edge
Low
VT82C686B Hardware Monitor
IRQ0
Edge
High
Timer0
(1)
IRQ1
Edge
High
Keyboard
IRQ2
Edge
High
Cascade Interrupt from Slave Interrupt Controller
IRQ3
Edge
High
COM2
(2)
IRQ4
Edge
High
COM1
(2)
IRQ5
Edge
Low
PCI PnP IRQ
IRQ6
Edge
High
FDC
(2)
IRQ7
Edge
High
LPT1
(2)
IRQ8_L
Edge
Low
Real Time Clock
(2)
IRQ9
Edge
Low
PCI PnP IRQ
IRQ10
Level
Low
PCI PnP IRQ
IRQ11
Level
Low
PCI PnP IRQ, USB
(3)
IRQ12
Edge
High
Mouse
(2)
IRQ13
Edge
High
FERR_L asserted
IRQ14
Edge
High
Primary IDE
(4)
IRQ15
Edge
High
Secondary IDE
(5)
Notes
:
1
f
Internally generated by the VT82C686B.
2
f
Suggested. These interrupts are plug and play compatible and may be routed to any avail-
able interrupt.
3
f
The USB interrupt is internally routed to the PIRQD# input of the VT82C686B.
4
f
This interrupt is routed to the IRQ14 input of the VT82C686B.
5
f
This interrupt is routed to the IRQ15 input of the VT82C686B.
