PEX 8532 Transparent Mode Port Registers
PLX Technology, Inc.
Notes: Register offset 80h is used only for downstream ports.
If the Power Indicator Present and/or Attention Indicator Present bits (offset 7Ch[4:3]) are set, writes to the
Slot Control register (offset 80h[15:0]) cause the downstream port to send the appropriate Power_Indicator_*
and Attention_Indicator_* messages (On/Blink/Off) to the downstream device, unless the Power Indicator
Control and Attention Indicator Control field (offset 80h[9:8 and 7:6], respectively) values that are written
are the reserved value 00b. Writing 00b to each of these fields is ignored (the stored value is not changed and
the Hot Plug message is not sent). Therefore, when writing to this register, the value written to both fields
should be 00b unless the purpose of the Write command is to change the state of the port’s HP_ATNLEDx#
or HP_PWRLEDx# Output signals, in which case Byte Writes can be used to target only one of the two
Control fields.
Register 11-29. 80h Slot Status and Control (All Ports)
Serial
Bit(s)
Description
Ports
Slot Control
Type
Default
EEPROM
Attention Button Pressed Enable
Upstream
RO
No
0
Not valid for the upstream port.
0 = Function is disabled
1 = Enables software notification with a Hot Plug
interrupt if the port is in the D0 Power State
(Power Management Status and Control register
Power State field, offset 44h[1:0]=00b), or with
a PME message if the port is in the D3hot state
(offset 44h[1:0]=11b), for an Attention Button
Pressed event on the corresponding PEX 8532
downstream port.
0
Downstream
RW
Yes
0
Power Fault Detector Enable
Upstream
RO
No
0
0
Not valid for the upstream port.
0 = Function is disabled
1 = Enables software notification with a Hot Plug
interrupt if the port is in the D0 Power State
(Power Management Status and Control register
Power State field, offset 44h[1:0]=00b), or with
a PME message if the port is in the D3hot state
(offset 44h[1:0]=11b), for a Power Fault event on
the corresponding PEX 8532 downstream port.
1
Downstream
RW
Yes
184
ExpressLane PEX 8532AA/BA/BB/BC 8-Port/32-Lane Versatile PCI Express Switch Data Book
Copyright © 2007 by PLX Technology, Inc. All Rights Reserved – Version 1.6
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