2.2.3. Configuration Parameter Scope

The DCM Catalog defines the scope of configuration parameters so that their value can apply either to one specific device or to a group of devices. There are three categories of parameter scope:

• Device-Specific: a device-specific configuration parameter value applies to only one device (board) in the system. When you edit a device specific configuration parameter, the parameter value applies only to that specific device. For example, the D41DAddress parameter is defined uniquely for each Hardware Configurable board in the system.
• Family-Level: a family-level configuration parameter applies to a family of devices (boards) in the system, such as the DIALOG/HD family. At this level, each family of devices has configuration information that is pertinent to the entire family of devices.
• Global: global configuration parameter values apply to all "applicable" devices. An applicable device is a device for which the parameter has functional relevance. For example, the D41DInterrupt parameter applies only to boards that employ jumpers and DIP switches to configure their memory and interrupt settings. The value of the D41DInterrupt parameter therefore has no applicability to boards that employ Board Locator Technology (BLT). Similarly, the BLTInterrupt parameter applies only to BLT boards; such boards are unaffected by the value of the D41DInterrupt parameter.

Overridable Configuration Parameters

Overridable configuration parameters can either be treated as global configuration parameters, affecting all applicable devices, or restricted to the device level. For example, by default the ParameterFile2 parameter affects all applicable devices. But it can also be modified as a device-level parameter. Once the configuration parameter has been modified at the device level, subsequent modifications to the global parameter have no effect at the device level.

The configuration parameter scope is determined by the DCM Catalog. It cannot be modified through the DCM API.

For information about controlling the scope of parameter read-write functions, see Section 2.3.3, Reading and Writing Configuration Parameter Values.

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