Emerson CC1000DM user manual Hot Swap, Model Description

Table 4-1:

Hot Swap System Models

C A R R I E R C A R D B U S I N T E R F A C E	.
	.
Hot Swap
	.
	. .

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:
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.

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