HP A7818-IE002 - Manual (Page 57)

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