82802AC datasheet(14/53 Pages) INTEL

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Intel

® 82802AB/AC Firmware Hub

Datasheet

2.1.

Pin Descriptions

The pin descriptions table details the usage of each device pin. Most pins have dual functionality, with

functions in both the Intel Firmware Hub and A/A Mux interfaces. The A/A Mux functionality for pins is

shown bold italic in the description box for that pin. All pins are designed to be compliant with

VCC + 0.3 V max. unless otherwise noted.

Table 1.

Pin Descriptions

Interface

Symbol

Type

Intel

FWH

A/A Mux

Name and Function

Interface Configuration Pin. This pin determines which interface is

used to communicate with the device. When it is held low, the Intel

FWH interface is enabled. When it is held High, the A/A Mux

interface is enabled. This pin must be set at power-up or before

return from reset, and must not be changed during device operation.

This pin is pulled down with an internal resistor of between 20 and

100 k

Ω. When the IC is High (A/A Mux mode), this pin will exhibit a

leakage current of approximately 200

µA. This pin may be floated,

which will select the Intel FWH mode.

RST#

Interface Reset. Valid for both A/A Mux and Intel FWH interface

operation. When driven low, RST# inhibits write operations to

provide data protection during power transitions, resets internal

automation, and tri-states pins FWH[3:0] (in Intel FWH interface

mode). RST#-high enables normal operation. When exiting from

reset, the device defaults to read array mode.

INIT#

Processor Reset. This is a second reset pin for in-system use. This

pin is internally combined with the RST# pin. If this pin or RST# is

driven low, identical operation is exhibited. This signal is designed to

be connected to the chipset INIT signal (Max. voltage depends on

the processor. Do not use 3.3 V).

A/A Mux = OE#

CLK

33-MHz Clock for Intel FWH Interface. This input is the same as

that for the PCI clock and adheres to the PCI specification.

A/A Mux = R/C#

FWH[3:0]

I/O

Intel FWH I/Os. I/O communication

A/A Mux = DQ[3:0]

FWH4

Intel FWH Input. Input communication

A/A Mux = WE#

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