PEX 8112 Fwd Riser Reference Design for Board Revision 1.0
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Version 1.1
Copyright © 2010 by PLX Technology, Inc. All rights reserved
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PEX 8112 Fwd Riser System Architecture
The PEX 8112 Fwd Riser assists customers in evaluating PLX Technology’s PEX 8112 PCI Express-to-PCI
bridge device. The usage configuration is forward bridging between a PCI Express base board and a PCI add-in
board. The PEX 8112 Fwd Riser is designed to showcase all PEX 8112 features when operating in Forward
Bridge mode.
The PEX 8112 Fwd Riser’s form factor is based on the
PCI Local Bus Specification, Revision 3.0
. The PCI
interface supports up to 32-bit transfers, at up to 66 MHz. The PEX 8112 Fwd Riser has one PCI slot (female)
connector (straddle mount). The PCI Express interface supports one lane operating at 2.5 Gbps.
PEX 8112 Fwd Riser power is generated from +3.3 VDC, provided through the PCI Express edge connector.
Limited PCI +5 VDC power is generated from +12 VDC, provided through the PCI Express edge connector.
Limited PCI -12 VDC power is generated from +5 VDC that was generated. PCI +3.3 VDC and +12 VDC are
provided through the PCI Express edge connector. If PCI bus power demands are beyond the capability of
onboard circuitry, PCI bus power can be supplied from a 4-pin hard disk power connector.
