PEX 8509RDK Hardware Reference Manual v1.1
© 2007, PLX Technology, Inc. All rights reserved.
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3.1.4
J4 Slot control/Hot Plug Control (SW4)
Figure 3-4. Switch SW4 Default Settings
Table 3-4. Switch SW4 Description
SW4 Functional Description
Switch Position Settings
Slot J4 Hot Plug Control. Allows the user to
select whether slot J4 is controlled via the PEX
8509 Hot Plug controller or normal board
power-up sequencing.
Default Setting is 0b.
1: J4CTL
Value
Function
0b
J4 is not Hot Plug
controlled.
1b
J4 is controlled via
Hot Plug
Hot Plug MRL[3]#. Used to simulate MRL
sensor behavior.
Default setting is 0b.
2: HP_MRL[3]#
Value
Function
0b Latch
closed
1b Latch
open
3.2 Push-Button
Switches
3.2.1
Hot Plug Attention Button# (SW5)
Switch SW5 provides a push-button switch control for the PEX 8509 Hot Plug Controller’s
HP_BUTTON[3]# input pin. The PEX 8509 contains internal debounce circuitry for this input.
3.2.2
Manual Reset# (SW6)
The PEX 8509 RDK provides a manual PERST# capability. Note that manual PERST# will only apply
warm reset to the PEX 8509, and slots J1, J2, J3, and J4 (not P1).
3.3
EEPROM Enable Jumper (JP5)
JP5 is used to enable an EEPROM presence detection to the PEX 8509. Install a shunt between pins 1 -
2 to indicate a Serial EEPROM is present. Un-install the shunt to indicate a Serial EEPROM is not present.
Table 3-5. Jumper JP2 settings
JP5 Setting
EEPROM Status
Shunt installed (Default)
Serial EEPROM present
Shunt not installed
Serial EEPROM not present
SW4
ON
J4CTL
MRL#
HIGH
LOW
1
1
2
ON
2
