82801AB datasheet(52/414 Pages) INTEL

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Functional Description

5-2

82801AA and 82801AB Datasheet

5.1.3

IDSEL to Device Number Mapping

When addressing devices on the external PCI bus (with the PCI slots) the ICH asserts one address

signal as an IDSEL. When accessing device 0, the ICH asserts AD16. When accessing Device 1,

the ICH asserts AD17. This mapping continues all the way up to device 15 where the ICH asserts

AD31. Note that the ICH’s internal functions (AC’97, IDE, USB, and PCI Bridge) are enumerated

like they are on a separate PCI bus (the Hub Interface) from the external PCI bus.

5.1.4

SERR#/PERR#/NMI# Functionality

Figure 5-1, Figure 5-2, and Figure 5-3 show the logic used to generate/report SERR#, PERR#, and

NMI#. Note that PERR# is only on the ICH (82801AA).

There are several internal and external sources that can cause SERR#. The ICH can be

programmed to cause an NMI based on detecting that an SERR# condition has occurred. The NMI

can also be routed to instead cause an SMI#. Note that the ICH does not drive the external PCI bus

SERR# signal active onto the PCI bus. The external SERR# signal is an input into the ICH driven

only by external PCI devices.

The ICH (82801AA) can detect and report different parity errors in the system. The ICH can be

programmed to cause an NMI (or SMI# if NMI is routed to SMI#) based on detecting a parity error.

Figure 5-1. NMI# Generation Logic

AND

IOCHK From SERIRQ Logic

NMI_SC

[IOCHK_NMI_EN]

AND

To NMI#

Output

and

Gating

Logic

NMI_SC

[IOCHK_NMI_STS]

AND

NMI_SC

[SERR#_NMI_STS]

NMI_SC

[PCI_SERR_EN]

D30:F0 SECSTS

[SSE]

D30:F0 PDSTS

[SSE]

AND

TCO1_STS

[HCNMI_STS]

TCO1_CNT

[NMI_NOW]

NMI_EN

[NMI_EN]

D30:F0 PD_STS

[DPD]

D30:F0 SECSTS

[Data Parity Error

Detected]

PCI Parity Error detected

during AC'97, IDE or USB

Master Cycle

D30:F0 BRIDGE_CNT

[Parity Error Response

Enable]

AND

D31:F0 PCISTA

[DPED]

PCI Parity Error detected

during LPC or Legacy DMA

Master Cycle

D31:F0 PCICMD

[PER]

AND

Hub Interface Parity

Error Detected

D30:F0 CMD

[Parity Error Response]

ich_nmi.vsd

Note: Shaded area above is for ICH (82801AA) only

82801AB Datasheet(PDF) 52 Page - Intel Corporation

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