PLX Technology PEX 8647-AA RDK, Справочник по аппаратуре

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2.7.1 Port Link Status Indication (D10 – D12)
The PEX 8647-AA RDK provides three green color link status LEDs (D10, D11 and D12) to indicate its port 0, port
4, and port 8 link states respectively. LED on, off, and three blinking patterns cover all five states of port link
status. (See
Table 2-2 for details)
Table 2-2. Port Link Status LED Functions
Port Link State LED Pattern
Link down off
Link up, 5Gbps, all lanes are up on
Link up, 5Gbps, reduced lanes are up Blinking: 0.5 second on, 0.5 second off
Link up, 2.5Gbps, all lanes are up Blinking: 1.5 second on, 0.5 second off
Link up, 2.5Gbps, reduced lanes are up Blinking: 0.5 second on, 1.5 second off
2.7.2 Fatal Error Indication (D13)
The PEX 8647 provides an output status pin (FATAL_ERR#) which reports the event of a PCI Express fatal error
condition. The RDK connects this output to a red LED (D13) which is lit when a fatal error condition is detected.
Examples of fatal error conditions are data link layer protocol errors, receiver overflow and malformed TLPs. The
PCI Express Base specification provides a complete listing of fatal error conditions. The
PEX 8647 Data Book
also provides additional details on the assertion of FATAL_ERR#.
2.7.3 PEX_INTA# Interrupt Indication (D14)
The PEX 8647 provides an output status pin (PEX_INTA#) for signaling various programmable events. The RDK
connects this output to a green LED (D14) for this interrupt output. Please refer to the
PEX 8647 Data Book for
additional information on the programmable events for PEX_INTA#.
2.7.4 PEX 8647 Voltage Level Monitoring (D8 – D9)
The PEX 8647-AA RDK provides a voltage level monitoring circuit for the 1V and 2.5V power supplies to the
PEX 8647. The circuit uses an Intersil multiple voltage supervisory chip (ISL6132), two bi-color LEDs (D8 and D9),
and various resistors. When the supplies fall below the +/- 10% range the red LED will turn on. (See
Table 2-3 for
details)
Table 2-3. Voltage Level Monitoring LED Functions
LED Green LED on/ Red LED off Green LED off/Red LED on
D8 1V to PEX 8647 /- 10% range 1V to PEX 8647 out of +/- 10% range
D9 2.5V to PEX 8647 /- 10% range 2.5V to PEX 8647 out of +/- 10% range
2.8 GPIO Pins
The PEX 8647 has twenty GPIO pins. Three of them, PEX_PORT_GOOD[0,4,8]#, are use for port link status and
GPIO pins [19:12] are connected to the external test points on the PEX 8647-AA RDK to be used by external
applications.
2.9 Upstream Port Select Pins
The PEX 8647 has four strap pins, STRAP_UPSTRM_PORSEL[3:0], for upstream port selection. On the RDK, all
these four pins are hard wired to ground with zero ohm resistors. That means port 0 is always the upstream port
on the RDK.
PEX 8647-AA RDK Hardware Reference Manual, Version 1.2
10 Copyright © 2008 by PLX Technology, Inc. All rights reserved