CP690HS
Hot Swap
ID 20955, Rev. 05
Page 5 - 3
P R E L I M I N A R Y
5.
Hot Swap
5.1
Technical Background of CompactPCI Hot Swap
In many modern application systems downtime is costly and/or unacceptable. Server applica-
tions, telecommunications networks and automated systems requiring continuous monitoring
call for a system design in which a single card can be inserted or extracted without affecting
the rest of the system. The ease with which a board may be removed and replaced is depen-
dent on the mechanical design (form factor), the possibility of deactivating the software drivers
for the board (operating system) and the possibility of removing and inserting the board without
disturbing the signal quality on the bus.
CompactPCI hot swap is currently the most effective way to meet this need. Staggered pins on
the backplane guarantee controlled power sequencing of the board, while the signals ENUM,
BDSEL, HEALTHY and the hot swap control and status register bits may be used to control
board access from the software side.
5.1.1
Hot Swap System
A hot swap system consists of a hot swap platform which comprises a hot swap backplane, the
system host (CPU) with hot swap features, cooling, power supplies etc. plus the boards to be
hot swapped. Hot swapping is not possible unless the operating system has the capability to
enable and disable the board-specific driver during normal operation.
Содержание CP690HS
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