Emerson 752I Manuel D’Utilisation
Hot Swap:
Hot Swap LED and Ejector Switch Control
12-4
Non-cPCI Hot Swap
When the cPCI functionality is disabled, the LED/ejector switch control mechanism works in
conjunction with the Power Good indication from the Hot Swap controller circuit, as shown
in
conjunction with the Power Good indication from the Hot Swap controller circuit, as shown
in
.
Figure 12-1:
Hot Swap Controller Circuit
Note:
The status of the ejector handle latch can be determined by reading the PCI0_HS bit in the MV64460 HS_CTL
register (PCI0_HS bit high = locked, PCI_HS bit low = unlocked). The status also can be read via MV644460
MPP/GPIO pin #31. It is an interruptable pin that can detect a change in the Hot Swap status, eliminating the
need for polling at the MPP pin or PCI0_HS bit.
register (PCI0_HS bit high = locked, PCI_HS bit low = unlocked). The status also can be read via MV644460
MPP/GPIO pin #31. It is an interruptable pin that can detect a change in the Hot Swap status, eliminating the
need for polling at the MPP pin or PCI0_HS bit.
The Hot Swap logic functions as follows when a board is inserted into a slot:
1
The Hot Swap LED illuminates immediately when the board is inserted. This is enabled
when the power good indicator, PWRGD*, from the Hot Swap controller is not being driven
when the power good indicator, PWRGD*, from the Hot Swap controller is not being driven
3.3_EARLY
HS Controller
Marvell
MV64460
3.3_EARLY
PWRGD*
PCI0_HS
3_3V
NOTE: Discrete logic
contained inside HSL PLD
Blue Hot
Swap LED
Ejector Switch
to backplane
Healthy*
BDSEL*