PLX Technology PEX 8505, Справочник по аппаратуре

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PEX 8505RDK Hardware Reference Manual v1.1
© 2007, PLX Technology, Inc. All rights reserved.
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3.7 Slots J1 Power Fault Indication (D20)
Slot J1 is power by the ATX 4-pin hard disk connector and a DC/DC converter (U12). No circuitry is
provided to current limit the power consumed by slot J1; however, a voltage supervisor is provided to
monitor under-voltage conditions on the +12V and +3.3V supply rails going to those slots. If either rail
drops below 15% of its nominal supply voltage, the power good signal from U3 is used to clear a D-flip
flop (U15), which will in turn light a red indicator LED (D14). Once the LED is lit, it remains lit until board
power is cycled.
4. Serial EEPROM Registers
4.1 Serial EEPROM Contents
The PEX 8505RDK is shipped with a programmed AT25080A EEPROM. PLX Technology provides the
necessary binary image files and software tools required to program the EEPROM. Install a jumper
between JP2 pins 1 and 2, before applying power to the RDK.
5. FAQ/Troubleshooting
5.1 Frequently Asked Questions
Q1) Does the PEX 8505RDK require that I use the RDK Port Expansion Kit.
A1) Yes. The PEX 8505RDK is required to plug into the RDK Port Expander in order to gain access to all
five ports/lanes.
Q2) What steps must I take to get my RDK working behind the RDK Port Expander?
A2) The RDK Port Expansion Kit has a separate Hardware Reference Manual, which provides of a list of
steps that should be taken prior to plugging the RDK into the RDK Port Expander.
Q3) Since the RDK Port Expansion Kit may use a different power than my host PC, is there a
power-up ordering requirement?
A2) Yes. The RDK Port Expander/PEX 8505RDK must have power applied before the PC is powered on.
This will ensure than the PC BIOS enumeration will see the PEX 8505 and it’s downstream components.
6. Bill of Materials/ Schematics
Item
#
Qty Man Man's Part # Des
Package
Type
Comp Des(s)
Subcon.
Part #
SURFACE MOUNT COMPONENTS
1 1
PLX
Technology
PEX8505-
AA25BI
IC, 5-lane, 5-port,
PCI Express
switch
SMT,
196-pin
PBGA
U1
2 1 Intersil ISL6536IB
IC, Four Channel
Supervisor
SMT, 8-
pin SOIC
U3
3 0 TI
TPS2310IP
W
IC, Dual-power
Hot Plug
Controller
SMT, 20-
lead
TSSOP
4 0 TI
SN74LVC1
G3157DCK
1-bit, SPDT
Analog switch
SMT, 6-
pin SC-70
Digikey
P/N: 296-