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CARRIER CARD BUS INTERFACE
Hot Swap
10004281-02 CC1000dm User’s Manual 4-3
can be added if the application warrants the additional hardware and software. To
implement Hot Swap, a system makes use of several resources on the system controller,
on peripheral boards, and on the backplane. These may include:
• Hot Swap Controller (HSC) on the system board
• Staged backplane pins
• Vendor-specific radial signals on the backplane
• CC1000dm signals BD_SEL*, HEALTHY*, and ENUM*
• A handle switch and blue LED on each peripheral board
•Power-ramping circuitry
• CC1000dm bus isolation circuitry
• Hot Swap Control and Status register (HS_CSR) on each peripheral board
Peripheral boards support one or more of four different system models, depending on
their implementation of Hot Swap, as previously defined. The method by which a
peripheral board makes hardware and software connections to a system differentiates
system models. For the purpose of this explanation, hardware connection is made when
a board is powered up and enabled for PCI access in configuration space (but not con-
figured). Software connection is made when the board is configured by the system and
necessary supporting software (for example, drivers) is loaded. In this state, the board is
ready for use by the operating system (OS) and/or application. The following table
shows four system models:
Model: Description:
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Non-Hot Swap These systems do not have Hot Swap capabilities. They cannot be
inserted or extracted from a system while it is operating.
Basic Hot Swap These support basic functionality to automatically connect hardware
when the board is inserted. An operator manually makes the software
connection.
Full Hot Swap These systems utilize the features of Full Hot Swap boards to
dynamically configure or reconfigure. Hardware on a peripheral board
automatically makes a hardware connection to the system and interrupts
a system controller board to allow for automatic software connection by
the system controller.
High Availability These systems use vendor unique platforms designed to allow the system
controller to more actively control peripheral board hardware
connections. Once hardware connection is made, the board supports
automatic software connection initiated by the system controller.
Ta b l e 4 - 1 :
Hot Swap System Models