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AR-B1462 User¡¦s Guide

2-2

2.3 INTERRUPT CONTROLLER

The equivalent of two 8259 Programmable Interrupt Controllers (PIC) are included on the AR-B1462 board. They

accept requests from peripherals, resolve priorities on pending interrupts in service, issue interrupt requests to the

CPU, and provide vectors which are used as acceptance indices by the CPU to determine which interrupt service

routine to execute.

Following is the system information of interrupt levels:

IRQ8 : Real time clock

IRQ9 : Rerouting to INT 0Ah from hardware IRQ2

IRQ10 : Reserved for LAN

IRQ11 : Serial port 4

IRQ12 : spare (PS/2 mouse)

IRQ13 : Math. coprocessor

IRQ14 : Hard disk adapter

IRQ15 : spare (Watchdog Timer)

InInterrupt Level

NMI

CTRL1

IRQ 0

IRQ 1

IRQ 2

IRQ 3

IRQ 4

IRQ 5

IRQ 6

IRQ 7

CTRL2

Parity check

Description

Serial port 2

Serial port 1

Serial port 3

Floppy disk adapter

Parallel port 1

System timer interrupt from timer 8254

Keyboard output buffer full

Figure 2-1 Interrupt Controller

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 80 81

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