Hewlett-Packard A7818-IE002 Manual

A SERVICE OF

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System Board

FirmWare Hub (82802AB)

Chapter 2

57

The FWH includes two hardware interfaces:

• FWH interface

• A/A Mux interface

The Interface Conﬁguration (IC) pin on the FWH provides the control between these

interfaces. You must select the interface mode prior to power-up or before return from

reset (RST# or INIT# low to high transition).

The FWH interface works with the ICH2 during system operation, while the A/A Mux

interface is designed as a programming interface for component preprogramming.

An internal CUI serves as the control center between the FWH and A/A Mux interfaces,

and internal operation of the nonvolatile memory. A valid command sequence written to

the CUI initiates device automation. An internal WSM automatically executes the

algorithms and timings necessary for block erase and program operations.

• Industry standard packages:

— 40L TSOP or 32L PLCC

• Case temperature operating range

Feature Feature