82801E datasheet(39/84 Pages) INTEL

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Intel® 82801E C-ICH

Advance Information Datasheet

GNT[3:0]#

/GNT[5]#

/GNT[B]#

/GPIO[17]#

PCI Grants: The 82801E C-ICH supports up to four masters on the PCI bus.

Pull-up resistors are not required on these signals. If pullups are used, they should

be tied to the Vcc3_3 power rail. GNT[B]#/GNT[5]#/GPIO[17] has an internal

pull-up.

PCICLK

PCI Clock: This is a 33 MHz clock. PCICLK provides timing for all transactions on

the PCI Bus.

PCIRST#

PCI Reset: 82801E C-ICH asserts PCIRST# to reset devices that reside on the PCI

bus. The 82801E C-ICH asserts PCIRST# during power-up and when S/W initiates

a hard reset sequence through the RC (CF9h) register. The 82801E C-ICH drives

PCIRST# inactive a minimum of 1 ms after PWROK is driven active. The 82801E

C-ICH drives PCIRST# active a minimum of 1 ms when initiated through the RC

PLOCK#

I/O

PCI Lock: PLOCK# indicates an exclusive bus operation and may require multiple

transactions to complete. 82801E C-ICH asserts PLOCK# when it performs

non-exclusive transactions on the PCI bus.

SERR#

System Error: SERR# can be pulsed active by any PCI device that detects a

system error condition. Upon sampling SERR# active, the 82801E C-ICH has the

ability to generate an NMI, SMI#, or interrupt.

REQ[A]#

/GPIO[0]

REQ[B]#

/REQ[5]#

/GPIO[1]

PC/PCI DMA Request [A:B]: This request serializes ISA-like DMA Requests for

the purpose of running ISA-compatible DMA cycles over the PCI bus. This is used

by devices such as PCI-based Super I/O or audio codecs that need to perform

legacy 8237 DMA but have no ISA bus.

When not used for PC/PCI requests, these signals can be used as General

Purpose Inputs. Instead, REQ[B]# can be used as the fifth PCI bus request.

GNT[A]#

/GPIO[16]

GNT[B]#

/GNT[5]#

/GPIO[17]

PC/PCI DMA Acknowledges [A:B]: This grant serializes an ISA-like DACK# for

the purpose of running DMA/ISA master cycles over the PCI bus. This is used by

devices such as PCI-based Super/IO or audio codecs which need to perform

legacy 8237 DMA but have no ISA bus.

When not used for PC/PCI, these signals can be used as General Purpose

Outputs. GNTB# can also be used as the fifth PCI bus master grant output. These

signal have internal pull-up resistors.

Table 11. PCI Interface Signals (Sheet 3 of 3)

Name

Type

Description

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