PLX Technology PEX 8624-AA RDK, Справочник по аппаратуре

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PEX 8624-AA RDK Hardware Reference Manual – Version 1.1
Copyright © 2010 by PLX Technology, Inc. All rights reserved
5
Although the three PCIe slots (SLOT 1-3) have a x16 link-width form factors, the slots themselves are configured
as x8 for SLOTs 1 & 3, and x4 for SLOT 2 as shown in
Figure 2-1 above. Using a x8-to-x4x4 Breakout Board, the
x8 slots (SLOTs 1 & 3) can be broken out into two x4 slots, creating two x4 ports from a x8 slot.
Port 8 or
Port 8&9
SLOT1
Port 5 or
Port 5&6
SLOT2
x8
Lane 24-31
x8
PEX 8624
(U1)
x16 PCI Express Edge Card Connectors
Downstream
Ports
Upstream Port
P1 X8 PCI Express Card Edge Connector
Lane0-3
Lane24-31
SLOT3
Lane4-7
Configuration
Module
Receptacle
x4
IP1
x4
x4
x4
x4
To upper 4
lanes of Port 0
Port 1
Port 1
Lane 0-3
A1
3
2
1
1
2
3
x8
x8
x4
X8 midbus probe
footprint (JP2)
X8 midbus probe
footprint (JP1)
4X Mini-SAS
Connector
Port 0 or
Port 0&1
Lane 32-39
Lane 4-7
Figure 2-2. PCI Express up to 5GT/s Gen 2 Connections
2.2.1 Configuration Modules and Receptacle CM1
Configuration Module Receptacle CM1 is a 200-pin high-speed Mezzanine Connector. It is soldered on the PCB
of PEX 8624-AA RDK. It directly connects to lane 4 to lane 7 of the PEX 8624, lane 4 to lane 7 of PCI Express
card edge connector P1, lane 0 to lane 3 of PCI Express Edge Card Connector SLOT 2, and lane 0 to lane 3 of
4x mini-SAS connector IP1.
One of three configuration modules (see
Figure 2-2 ) can be plugged into the Configuration Module Receptacle
(CM1) of the PEX 8624-AA RDK. Which Configuration Module is used determines how lanes 4-7 of the PEX 8624
are routed:
1) Configuration Module 1 (marked “Enable Cable IP1”) routes lanes 4-7 to the 4X Mini-SAS Connector.
2) Configuration Module 2 (marked “Enable SLOT 2” routes lanes 4-7 to PCIe SLOT 2.
3) Configuration Module 3 (marked “Enable P1 as x8”) routes lanes 4-7 to the x8 PCIe Card Edge
Connector to enable P1 as a x8 Port.