HP Kayak XU800 Series, Technical Reference Manual

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2 System Board
FirmWare Hub (82802AB)
FirmWare Hub (82802AB)
The FWH (also known as flash memory) is connected to the LPC bus. It
contains 4 Mbit (512 kB) of flash memory.
The hardware features of the FWH include: a Random Number Generator
(RNG), five General Purpose Inputs (GPI), register-based block locking and
hardware-based locking. An integrated combination of logic features and
non-volatile memory enables better protection for the storage and update of
system code and data, adds flexibility through additional GPIs, and allows
for quicker introduction of security/manageability features.
The following table shows the available FWH features
.
Feature Feature
• Platform Compatibility:
❒
Enables security-enhanced platform infrastructure.
❒
Part of the Intel I840 chipset.
• Two Configurable Interfaces:
❒
FirmWare Hub interface for system operation.
❒
Address/Address Multiplexed (A/A Mux) interface.
• FirmWare Hub Interface Mode:
❒
Five signal communication interface supporting x8 reads and
writes.
❒
Register-based read and write protection for each code/data
storage blocks.
❒
Five additional GPIs for system design and flexibility.
❒
A hardware RNG (Random Number Generator).
❒
Integrated CUI (Command User Interface) for requesting
access to locking, programming and erasing options. It also
handles requests for data residing in status, ID and block lock
registers.
❒
Operates with 33 MHz PCI clock and 3.3 V input/output.
• 4 Mbits of Flash Memory for system code/data non-volatile
storage:
❒
Symmetrically blocked, 64 Kbyte memory sections.
❒
Automated byte program and block erase through an
integrated WSM (Write State Machine).
• A/A Mux Interface/Mode, supporting:
❒
11-pin multiplexed address and 8-pin data I/O interface.
❒
Fast on-board or out-of-system programming.
• Power Supply Specifications:
❒
Vcc: 3.3 V +/- 0.3 V.
❒
Vpp: 3.3 V and 12 V for fast programming, 80 ns.
• Industry Standard Packages:
❒
40L TSOP or 32L PLCC.
• Case Temperature Operating Range.