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Chapter 3 Hardware

18 Reference Manual CoreModule 430

Interrupt Channel Assignments

The interrupt channel assignments are shown in Table 3-2.

Legend: D = Default, O = Optional, X = Fixed

Table 3-2. Interrupt Channel Assignments

Device vs IRQ No. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Timer X

Keyboard X

Secondary Cascade X

COM1 D

COM2 D O

COM3 O O O D

COM4 O O D O

Parallel O D

RTC X

IDE D

Math Coprocessor

(only in DX

processor)

PS/2 Mouse X

PCI INTA Automatically Assigned

PCI INTB Automatically Assigned

PCI INTC Automatically Assigned

PCI INTD Automatically Assigned

USB Automatically Assigned

VGA Automatically Assigned

Ethernet Automatically Assigned

NOTE The IRQs for the Ethernet, Video, and Internal Local Bus (ISA) are

automatically assigned by the BIOS Plug and Play logic. Local IRQs assigned

during initialization can not be used by external devices.

Table 3-3. DMA Map

DMA # Use

0-1, 5, 6, 7 Direct Memory Access

3 LPT 1, only in ECP mode (configurable)

4 DMA 1 cascade

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 55 56

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