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3.6 Interrupts

Figure 3–4 Interrupt Logic

PCI Bus

21164

eb164.2

cpu_reset_l

Keyboard

and Mouse

Controller

ISA

PCI−to−ISA

Bridge

Combination

Controller

irq<15:3 ,1>

<7:3><12, 1>

drq<7:5, 3:0>

eb164.25

eb164.27eb164.32

PCI

Slots

MK−2306−22

System

Interrupt

PLD

eb164.30

sio_int

eb164.20−.22

eb164.26

MUX

eb164.5

Slots

sys_mch_chk_irq

jmp_irq3*

Control,

and Address

eb164.8

pci_int _l

xn

Ubus<7:0>

cia_error

sio_nmi

jmp_irq2*

jmp_irq1*

jmp_irq0*

jmp_pwr_fail*

jmp_mch_hlt**

error_nmi

Pull−Down

rtc_irq_h

pci_isa_irq

cia_int

Pull−Down

Pull−Down

cpu_irq3

pwr_fail_irq

mch_hlt_irq

cpu_irq0

cpu_irq1

cpu_irq2

irq_reset_l

Decodes

sense_dis

ISA Bus

pci_isa_irq

eb164.5

I/O Interface,

Pull−Down

*From J1 jumpers

**From Halt switch

3–14 Functional Description