AMD-766 datasheet(18/96 Pages) AMD

18 / 96 page

Preliminary Information

23167B – March 2001

AMD-766

TM Peripheral Bus Controller Data Sheet

4.3.4

Interrupt Controllers

The IC includes two interrupt controllers: the legacy PIC and an IOAPIC. Interrupt sources are routed to the

interrupt controllers as shown in the following diagram.

IOAPIC

redirection

registers

APIC interrupt

message bus

SCI

Interrupt pins

to the host

Legacy

PIC

GPIO[17, 16, 3, 2 ]

Interrupt

routing

logic

IRQ pins, TCO,

PNPIRQ[2:0],

serial IRQ

PIRQ[D:A]#

INTR

NMI, INIT

SMI

4.3.4.1

Interrupt Routing Logic

Vectored interrupt requests are routed to the legacy

PIC and APIC as shown. The interrupt signals to the

PIC may be either rising-edge triggered or active-low

level triggered. It is expected that edge-triggered

interrupts such as IRQ14 from the IDE controller rise

into the PIC to indicate the presence of an interrupt.

Conversely, level-sensitive interrupts are low into the

PIC to indicate the presence of an interrupt. Edge and

level sensitivity for each IRQ are programmed into the

PIC through PORT4D0.

PIRQ[D:A]#

PNPIRQ[2:0]

IRQx (from ISA bus)

Serial IRQs

PIC

IOAPIC

PORTD0

USB_INT

SCI_IRQ

PIC_IRQx

Interrupt

Routing

Logic

The internal USB interrupt signal drives the PIRQD# pin low as an output; when the USB interrupt is deasserted,

PIRQD# is left in the high impedance state. So the USB interrupt is wired-ORed into the active state with external

interrupts on PIRQD#. The result enters the IC and goes to the interrupt routing logic.

The following are the interrupt routing logic equations:

AMD-766 Datasheet(PDF) 18 Page - Advanced Micro Devices

AMD-766 Datasheet(HTML) 18 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

Datasheet Download

Link URL