Design Applications
ExpressCard™ Adapter – Forward Bridge
The PEX 8112 can be used to quickly upgrade legacy PCI
adapter board designs to be compatible with PCI Express
standard interface slots. In Figure 2, an existing CardBus™ IC
is converted for use on an ExpressCard™ with the addition of
the single-chip PEX 8112.
™
ExpressCard
Embedded Host Platform – Reverse Bridge
The PEX 8112 supports Reverse bridging, enabling designers
to utilize the latest PCI Express silicon with widely entrenched
PCI host systems. Reverse bridging allows the host processor
to reside on the PCI bus; the PEX 8112 will accept
configuration cycles from the PCI side and manage the PCI
Express interface as a secondary entity within the PCI
software model as in Figure 3.
PCI Slots
CardBus
Silicon
PCI Bus
PEX
8112
8111
PCI
Host
CPU
PCI Bus
Figure 2. Forward Bridge in ExpressCard™
PEX
8112
8111
PCI
Express
ASIC
Figure 3. Reverse Bridge with PCI CPU
Development Tools
PEX 8112 Reference Design Kits (RDK)
enable rapid customer design. The Reverse Bridge RDK (Figure 4) includes a standard
PCI connector (card-edge) and a standard PCI Express slot on the secondary side. The Forward Bridge RDK (Figure 5) includes the
PEX 8112 with a single x1 PCI Express port (card-edge) and four PCI slots on the secondary side. Each PEX 8112RDK can be
installed in a motherboard to evaluate PEX 8112 features and validate customer software.
EEPROM
PEX
8112
Bridge
EEPROM
JTAG
Header
H
e
a
d
e
r
J
T
A
G
PEX 8114
Bridge
PEX
8112
EEPROM
Figure 4. Reverse Bridge RDK
Figure 5. Forward Bridge RDK
Product Ordering Information
Part Number
PLX Technology, Inc.
870 Maude Ave.
Sunnyvale, CA 94085 USA
Tel: 1-408-774-9060
.
Fax: 1-408-774-2169
Email:
info@plxtech.com
Web Site:
www.plxtech.com
Description
PCI Express to PCI Bridge, Standard-Pitch BGA Package, Lead Free
PCI Express to PCI Bridge, Fine-Pitch BGA Package, Lead-Free
Forward Bridge Reference Design Kit
Reverse Bridge Reference Design Kit
PEX8112-AA66BI F
PEX8112-AA66FBI F
PEX8112RDK-F
PEX8112RDK-R
Please visit the PLX Web site at
http://www.plxtech.com
or contact PLX sales at 408-774-9060 for sampling.
© 2007 PLX Technology, Inc. All rights reserved. PLX and the PLX logo are registered trademarks of PLX Technology, Inc. ExpressLane is a trademark of PLX Technology, Inc., which may be
registered under some jurisdiction. All other product names that appear in this material are for identification purposes only and are acknowledged to be trademarks or registered trademarks of their
respective companies. Information supplied by PLX is believed to be accurate and reliable, but PLX Technology, Inc. assumes no responsibility for any errors that may appear in this material. PLX
Technology, Inc. reserves the right, without notice, to make changes in product design or specification.
PCI8112-SIL-PB-P1-1.0
04
/07 500
PLX [ PLX TECHNOLOGY ]
