PEX 8624-AA RDK Hardware Reference Manual – Version 1.1
Copyright © 2010 by PLX Technology, Inc. All rights reserved
11
2.8 Power
Distribution
The PEX 8624-AA RDK has two sources of DC power. The first source is the card edge connector (P1). The x8
connector provides up to 2.1A at 12V and 3.0A at 3.3V from the PCI Express edge card connector it plugs in. The
power from P1 is intended to power the PEX 8624, PCI Express connector SLOT 2, and the on-board electronic
components. The dc/dc converter U12 converts 12V from the Card Edge connector to 1.0VCC to support the
SerDes and core power of the PEX 8624. The LDO U13 converts 3.3V to 2.5VCC to support the I/O power of the
PEX 8624.
The second source of power includes an ATX HD power connector J1, and a 5V to 3.3V step down dc/dc
converter U11. Through controlled power MOSFETS, connector J1 provides 12VCC up to 5A to each of PCI
Express Edge Card Connectors SLOT 1 and SLOT 2. The J1 also provides enough 5V power for the dc/dc
converter U11 to generate 3.3VCC up to 3A for each of SLOT 1 and SLOT 2 (See
Figure 2-8
for details).
12V_A
5V_A
Figure 2-8. PEX 8624-AA RDK Power Subsystem
2.9 LED
Indicators
The PEX 8624-AA RDK provides a number of LED indicators including power-on indication, PEX 8624 port link
status indication, Hot-Plug LED indication, fatal error indication, event/error indication, and voltage level
monitoring indications.
Table 2-1
provides a quick explanation of the various board indicators.
Table 2-1. PEX 8624-AA RDK LED Indicator descriptions
Indicator Type
Locations
LED Functions
Slot Power LED/green color
D1
On: 12V at PCI Express connectors SLOT 2
D2
On: 3.3V at PCI Express connectors SLOT 2
Slot Power LED/green color
D8
On: 12V at PCI Express connectors SLOT 1
D9
On: 3.3V at PCI Express connectors SLOT 1
SERIAL HOT-PLUG LED/green color
D3
On: HP power LED output active at port 1
D4
On: HP Attention LED output active at port 1
Содержание PEX 8624-AA RDK
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