
A
82454KX/GX (PB)
PRELIMINARY
17
82454KX/GX PCI Bridge (PB)
s Supports the Pentium Pro Processor at
60 MHz and 66 MHz Bus Speeds
s PCI Specification 2.0 Compliant
s 64-Bit Data Bus and 36-Bit Address Bus
s Parity Protection on Control Signals
s Up to Eight Deep In-Order Queue
s Four Deep Outbound Request Queue
s Dual-Processor Support (450KX)
s Four Cache Line Size Read and Write
Buffers
s GTL+ Host Bus Interface
s Synchronous PCI Interface
—
ECC Protection on Data Bus
(450GX)
—
Quad-processor Support (450GX)
s 32-bit Address/Data PCI Bus (64-bit Dual
Cycle Address Support)
s Parity Protection on All PCI Bus Signals
s Four Deep Inbound Request Queue
s Data Collection/Write Assembly of Line
Bursts.
s Single Chip: Combined Controller and
Data Path in a 304-Pin QFP or 352 BGA
s Support for 3.3V and 5V PCI Devices
s On-Chip Digital PLL (DPLL)
s Component and In-System Connectivity
Test Support (JTAG)
—
Internal Bridge Arbiter For Two PBs
in a system (450GX)
The 82454KX/GX PB are single-chip PC-compatible host-to-PCI bridges. A rich set of Host-to-PCI and PCI-to-
Host bus transaction translations optimize bus bandwidth and improve system performance. All ISA and EISA
regions are supported. Three programmable memory gaps can be created—a PCI Frame Buffer Region and
two general-purpose memory gaps (the Memory Gap Region and the High Memory Gap Region). The PB has
a synchronous interface to the Pentium Pro processor bus and supports a derived clock for the synchronous
PCI interface. The PB generates and checks ECC over the host data bus (82545GX only), and generates and
checks parity over the address and request/response signal lines (both 82454KX and 82454GX). The PB also
checks address and data parity on the PCI bus. For the 82454GX, two PBs can be used in a system.
The Intel 450KX/GX PCIsets may contain design defects or errors known as errata. Current characterized
errata are available upon request.
This document describes both the 82454KX and 82454GX PBs. Unshaded areas describe features common to
the 82454KX and 82454GX. Shaded areas, like this one, describe the 82454GX operations that differ from the
82454KX.