Intel 82443BX Features
• Processor/host bus support
— Optimized for Pentium® II
processor at 100 MHz system bus
frequency; Support for 66 MHz
— Supports full symmetric
• AGP interface
— Supports single AGP compliant
device (AGP-66/133 3.3V device)
— AGP Specification Rev 1.0
compliant
Multiprocessor (SMP) Protocol for
up to two processors; I/O APIC
related buffer management support
(WSC# signal)
— AGP-data/transaction flow
optimized arbitration mechanism
— AGP side-band interface for efficient
request pipelining without
— In-order transaction and dynamic
deferred transaction support
— Desktop optimized GTL+ bus driver
technology (gated GTL+ receivers
for reduced power)
interfering with the data streams
— AGP-specific data buffering
— Supports concurrent CPU, AGP and
PCI transactions to main memory
— AGP high-priority transactions
(“expedite”) support
• Integrated DRAM controller
— 8 to 512 Mbytes or 1GB (with
registered DIMMs)
• Power Management Functions
— Stop Clock Grant and Halt special
cycle translation (host to PCI Bus)
— Mobile and “Deep Green” Desktop
support for system suspend/resume
(i.e., DRAM and power-on suspend)
— Dynamic power down of idle DRAM
rows
— Supports up to 4 double-sided
DIMMs (8 rows memory)
— 64-bit data interface with ECC
support (SDRAM only)
— Unbuffered and Registered
SDRAM (Synchronous) DRAM
Support (x-1-1-1 access @ 66 MHz,
x-1-1-1 access @ 100 MHz)
— Enhanced SDRAM Open Page
Architecture Support for 16- and
64-Mbit DRAM devices with 2k, 4k
and 8k page sizes
— SDRAM self-refresh power down
support in suspend mode
— Independent, internal dynamic clock
gating reduces average power
dissipation
— Static STOP CLOCK support
— Power-on Suspend mode
— Suspend to DRAM
• PCI bus interface
— PCI Rev. 2.1, 3.3V and 5V, 33MHz
interface compliant
— ACPI compliant power management
• Packaging/Voltage
— 492 Pin BGA
— PCI Parity Generation Support
— Data streaming support from PCI to
DRAM
— Delayed Transaction support for
PCI-DRAM Reads
— Supports concurrent CPU, AGP and
PCI transactions to main memory
— 3.3V core and mixed 3.3V and GTL
I/O
• Supporting I/O Bridge
— System Management Bus (SMB)
with support for DIMM Serial
Presence Detect (SPD)
— PCI-ISA Bridge (PIIX4E)
— Power Management Support
— 3.3V core and mixed 5V, 3.3V I/O
and interface to the 2.5V CPU
signals via open-drain output buffers
The Intel® 440BX AGPset is intended for the Pentium® II processor platform and emerging 3D
graphics/multimedia applications. The 82443BX Host Bridge provides a Host-to-PCI bridge,
optimized DRAM controller and data path, and an Accelerated Graphic Port (AGP) interface.
AGP is a high performance, component level interconnect targeted at 3D graphics applications
and is based on a set of performance enhancements to PCI.
The Intel 82443BX may contain design defects or errors known as errata which may cause the products to deviate from
published specifications. Current characterized errata are available on request.
82443BX Host Bridge Datasheet
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ETC [ ETC ]
