AMD-766AC AMD [Advanced Micro Devices], AMD-766AC Datasheet - Page 21

• Manufacturer Part Number: AMD-766AC
• Description: Peripheral Bus Controller
• Manufacturer: AMD [Advanced Micro Devices]

23167B – March 2001
4.3.4.2.2
The IOAPIC supports 24 interrupt request signals. Each interrupt request input is combined with its corresponding
redirection register to specify the behavior of the interrupt. These interrupt request signals are connected to
redirection registers (APIC IRQs) as shown in the following table.
Note: APIC IRQs [23:20] may also be ORed with the TCO IRQ as specified by C3A44[TCO_INT_SEL]. Note:
PIC_IRQx is specified in section 4.3.4.1.
4.3.5
The real-time clock logic requires an external 32 kHz oscillator connected to RTCX_IN and RTCX_OUT. It
includes a clock and calendar timer, an alarm (which generates an interrupt), and 256 bytes of non-volatile RAM. It
is register compatible with the legacy PC real-time clocks. It meets ACPI real-time clock requirements. The real-
time clock resides on the VDD_AL power plane.
4.4
The enhanced IDE controller support independent primary and secondary ports. Each port supports two drives.
Supported protocols include PIO modes 0-4, multi-word DMA, and ultra DMA modes through to ATA-100. Each of
the four possible drives may be programmed to operate in any mode independent of the other drives.
The enhanced IDE controller is accessed through function 1 PCI configuration registers (C1Axx).
4.5
The USB Controller is an implementation of the Open Host Controller Interface 1.0a specification containing a host
controller core, a 4-port root hub, and hardware traps for legacy keyboard and mouse emulation.
4.5.1
The USB interrupt signal is drive low the PCI interrupt, PIRQD#. However, it may be diverted to SMIs by the
OHCI-defined register HcControl_InterruptRouting. See section 4.3.4.1 for data on routing keyboard and mouse
emulation interrupts. SMI interrupts are also generated in response to accesses to IO ports 60h and 64h and to IRQ1
and IRQ12 in support of the emulation logic.
APIC IRQ Connection
10
11
0
1
2
3
4
5
6
7
8
9
Enhanced IDE Controller
USB Controller
Real-Time Clock (Logic Powered by VDD_AL)
USB Interrupts
The IRQ lines
PIC INTR output
PIC_IRQ1
PIC_IRQ0 (PIT)
PIC_IRQ3
PIC_IRQ4
PIC_IRQ5
PIC_IRQ6
PIC_IRQ7
PIC_INT8 (RTC)
PIC_IRQ9
PIC_IRQ10
PIC_IRQ11
Preliminary Information
APIC IRQ Connection
12
13
14
15
16
17
18
19
20
21
22
23
AMD-766
PIC_IRQ12
PIC_IRQ13 (floating point error)
PIC_IRQ14
PIC_IRQ15
PIRQA#
PIRQB#
PIRQC#
PIRQD#
GPIO2 (see PMC2)
GPIO3 (see PMC3)
SCI or GPIO16 (see C0A4B and PMD0)
SMI or GPIO17 (see C0A4B and PMD1)
TM
Peripheral Bus Controller Data Sheet
21