PEX 8624-AA RDK Hardware Reference Manual – Version 1.1
Copyright © 2010 by PLX Technology, Inc. All rights reserved
6
Figure 2-2
shows the RDK PCI Express Gen 2 connections and the top view of the three configuration modules.
By default, PEX 8624-AA RDKs are shipped to customers with Configuration Module 3, enabling three x8 ports.
To achieve other configurations, a combination of x8-to-x4x4 Breakout Boards and/or Configuration Modules 1 or
2 will be required.
2.2.2
PCI Express Card Edge Connector P1
Card Edge Connector P1 can directly plug into a x8 or x16 PCI Express slot. Lanes 0-3 of PEX 8624’s Port 0 is
connected to this connector through a x8 midbus probe footprint (JP1). PEX 8624’s lanes 4-7 also passes through
the x8 midbus probe footprint (JP1) and connects to the CM1 receptacle. When Configuration Module 3 is
plugged into the CM1 receptacle, the PEX 8624’s lanes 4-7 are routed to Connector P1 and become the upper
four lanes of Port 0’s x8 link. By default, the PEX 8624-AA RDK sets this port to be the upstream port. Connector
P1 also provides 12V and 3.3V power, along with PERST# and REFCLK_P/N to the RDK.
2.2.3
PCI Express Edge Card Connector SLOT 1
Connector SLOT 1 is a straddle-mount, x16 PCI Express connector. Cards plugging into this slot will be in-line
with the RDK. Eight lanes, lanes 24-31, from the PEX 8624 are connected to this connector. The default
configuration of the PEX 8624-AA RDK sets the x8 link, Port 5, at this connector to be a downstream port. With a
x8-to-x4x4 breakout board plugged into the connector, the x8 link at port 5 can be split into two x4 links, Port 5
and Port 6. Power is provided to this connector from the ATX hard disk power connector J1 through the power
MOSFETs which are controlled by the Parallel Hot-Plug Controller (PHPC) of PEX 8624 (see Section
2.5.1
for
details).
2.2.4
PCI Express Edge Card Connector SLOT 2
Connector SLOT 2 is a vertical-mount through-hole x16 PCI Express connector. Cards plugging into this slot will
be perpendicular to the RDK. When Configuration Module 2 is plugged into the CM1 receptacle, lanes 4-7 from
the PEX 8624 pass the midbus probe footprint JP1 and CM1 and connects to Lane 0 to lane 3 of this connector.
Depending on the port configuration, port 1 at connector SLOT 2 can be a downstream port, upstream port or an
NT port. Power is provided to this connector from the ATX hard disk power connector J1 through the power
MOSFETs which are controlled by the Serial Hot-Plug Controller of the PEX 8624 (see Section
2.5.2
for details).
2.2.5
PCI Express Edge Card Connector SLOT 3
Connector SLOT 3 is a vertical-mount through-hole x16 PCI Express connector. Cards plugging into this slot will
be perpendicular to the RDK. Eight lanes, lanes 32-39, from PEX 8624 are connected to this connector. The
default configuration of the PEX 8624-AA RDK sets the x8 link, Port 8, at this connector to be a downstream port.
With a x8-to-x4x4 breakout board plugged into this connector, the x8 link can be split into two x4 links, Port 8 and
Port 9. Power is provided to this connector from the PCI Express card edge connector P1.
2.2.6
4X Mini-SAS Connector IP1
PEX 8624 only supports Non-Transparent (NT) mode on Port 0 or Port 1 of Station 0. The 4X mini-SAS connector
IP1 provides the simplified connections for the customers to connect the PEX 8624-AA RDK to two PC
motherboards. When the Configuration Module 1 is plugged into the CM1 receptacle, lanes 4-7 from the PEX
8624 pass the midbus probe footprint JP1 and CM1 and connects to the 4X mini-SAS connector IP1. Depending
on the port configuration, Port 1 at connector IP1 can be set as a downstream port, upstream port or an NT port.
Figure 2-3
shows a set up using PEX 8624-AA RDK’s NT function. Either Motherboard A or B can be connected
to an upstream port or NT port of the PEX 8624.
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