HP XU700 - Manual (Page 54)

54
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.