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| 型號(hào)： | TA235 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TECHNICAL ARTICLE |
| 中文描述： | 技術(shù)文章 |
| 文件頁(yè)數(shù)： | 1/6頁(yè) |
| 文件大小： | 35K |
| 代理商： | TA235 |
October 2000
1/6
TA 235
TECHNICAL ARTICLE
FIRMWARE HUB (FWH):
NEW GENERATION STORAGE FOR BIOS
James Lee
STMicroelectronics Inc.
Lexington, MA, USA
Sandro D’Angelo
STMicroelectronics
Catania, Italy
The traditional PC motherboard uses a chip-set
containing two controllers, called the
North Bridge
and the
South Bridge.
Intel replaces these with the
Hub
. In the
Hub Architecture
the two controllers
are connected to each other via a new Interlink
dedicated bus. This is a high-speed bus that has
twice the bandwidth of the PCI bus that works at
266 MBytes per second and resembles the new
point-to-point channel. The new Intel PC platforms
incorporate three primary components:
I
the Memory Control Hub (MCH),
I
the I/O Control Hub (ICH),
I
the Firmware Hub (FWH).
They use the
Intel Hub Protocol
that allows a
greater flow of information from the I/O controller
to the memory controller.
What is the Firmware Hub
The Firmware Hub (FWH) is a flash memory
device for BIOS storage, based on Intel’s Low Pin
Count (LCP) Interface Specification. It eliminates
a redundant nonvolatile memory component and
is a fundamental part of the new generation PC
motherboards. It is the key to future security and
manageability of infrastructures for the PC
platform.
Firmware Hub Functional Description
The memory of the FWH is constructed in a
uniformed matrix array of 64 KByte blocks to allow
each block to be erased and reprogrammed
without affecting other blocks. For functional
flexibility the FWH can be operated with two
different interfaces:
I
the Firmware Hub Interface (FWH) for
embedded operation
I
the Address/Address Multiplexed Interface (A/
A Mux) for programming operation during
manufacturing.
They are selected by the setting of the Interface
Configuration (IC) pin at V
IL
for FWH Interface
mode and V
IH
for A/A Mux Interface mode.
Figure 1. Firmware Hub Interface
Configuration
AI03623
4
FWH4
FWH0-
FWH3
VCC
M50FW040
CLK
VSS
4
IC
RP
TBL
5
INIT
WP
ID0-ID3
FGPI0-
FGPI4
VPP
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