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Interface Selection Guide T
exas Instruments 4Q 2006
TI’s PCI Express bridge chip, the XIO2000A, is
an industry first. It is designed for seamless
migration from the legacy PCI to the PCI
Express interface. It bridges an x1 PCI Express
bus to a 32-bit, 33/66-MHz PCI bus capable of
supporting up to six PCI devices downstream.
The XIO2000A fully supports PCI Express rates
of 2.5 Gbps. Its architecture supports the PCI
2.3 interface. The chip’s design enables PC
and I/O add-on card manufacturers to begin
transitioning to native PCI Express technology
while preserving compatibility with existing
PCI system software and firmware.
Key Features
• Compliant with PCI Express to PCI/PCI-X
Bridge Specification Revision 1.0
• Compliant with PCI Express Base
Specification 1.0a
• Compliant with PCI Local Bus Specification
rev 2.3
• Utilizes 100 MHz differential PCI Express
Common Reference Clock or 125 MHz
Single-Ended Reference Clock
• Full PCI Local Bus 66 MHz/32-bit Throughput
• Wake/Beacon Event Support
• Robust Architecture to Minimize Latency
K
ey Benefits
• Built-in adaptive receiver equalizer
••
Improves jitter tolerance thereby
reliably increasing PCB trace, or cable
length, supported by the XIO2000
• Seven buffered PCI clock outputs
(33 MHz or 66 MHz)
••
Reduces external components, costs
and premium board space
• 32-bit secondary PCI bus with 33-MHz or
66-MHz clocking option
••
Customizes to meet the needs of high-
performance or low-power applications
• Proven compatibility with various PCI
Express chipsets and PCI add-in cards
••
Rigorous field testing with major root
complex device and numerous PCI
add-in cards
• Compact footprint
••
Allows placement in ExpressCard and
mini-PCI cards in limited board space
• Advanced power management
features
••
Software programmable and hardware
autonomous power management
features for low-power applications
such as ExpressCard
Target Markets
The XIO2000A meets the needs of multiple
market segments, including desktop and
mobile PC, server, storage, PC add-in cards
and embedded systems.
PCI Express
®
Bridge Chip
XIO2000A
G
et samples, datasheets, EVMs and app reports at:
w
ww.ti.com/sc/device/XIO2000A
XIO2000A functional block diagram.
Typical system implementation.
PCI Express
Transmitter
Power
Mgmt
Clock
Generator
Reset
Controller
Configuration and
Memory Register
PCI Bus Interface
PCI Express
Receiver
GPIO
Serial
EEPROM
Serial IRQ
Upstream
PCI Express
Device
Vaux
Auxilliary
Power
Serial
EEPROM
Miscellaneous
PCI Bus functions:
CLR_RUN, PWR_OVRD,
LOCK, M6 6EN,
PME, External Arbiter
PCI Express
Link
PCI Bus—32 bit, 33/66 MHz
System Side
PCI
Express
Reference
Clock
GPIO
Serial
Interrupt
Controller
XIO2000A
PCI Express
®
30
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