qr code reader camera c# Lower-Level Configurations in C#

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Lower-Level Configurations
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Let s examine the configuration for the lower-level configuration style first Following is an example of such a configuration for the decode entity:
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CONFIGURATION decode_llcon OF decode IS FOR structural FOR I1 : inv USE CONFIGURATION WORKinvcon; END FOR; FOR I2 : inv USE CONFIGURATION WORKinvcon; END FOR; FOR ALL : and3 USE CONFIGURATION WORKand3con; END FOR; END FOR; END decode_llcon;
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This configuration specifies which configuration to use for each component in architecture structural of entity decode The specified lower-level configuration must already exist in the library for the current configuration to compile Each component being configured has a FOR clause to begin the configuration and an END FOR clause to end the configuration specification for the component Each component can be specified with the component instantiation label directly, as shown for component I1, or with an ALL or OTHERS clause as shown by the and3 components After the component is uniquely specified by label or otherwise, the USE CONFIGURATION clause specifies which configuration to use for this instance of the component In the preceding example, the configuration specification for component I1 uses the configuration called invcon, from the working library For configuration decode_llcon to compile, configuration invcon must have been already compiled into library WORK Notice that the names of the entities, architectures, and configurations reflect a naming convention In general, this is a good practice It helps distinguish the different types of design units from one another when they all exist in a library The advantage of this style of configurations is that most configurations are easy to write and understand The disadvantage is not being able to change the configuration of a lower-level component, without implementing a two-step or more process of recompilation when hierarchy levels increase
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Entity-Architecture Pair Configuration
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The other style of component configurations is the entity-architecture pair style Following is an example of a configuration that uses the same entity and architectures as the previous example:
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CONFIGURATION decode_eacon OF decode IS FOR structural FOR I1 : inv USE ENTITY WORKinv(behave); END FOR; FOR OTHERS : inv USE ENTITY WORKinv(behave); END FOR; FOR A1 : and3 USE ENTITY WORKand3(behave); END FOR; FOR OTHERS : and3 USE ENTITY WORKand3(behave);
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Configurations
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END FOR; END FOR; END decode_eacon;
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This configuration looks very similar to the lower-level configuration style except for the USE clause in the component specification In the previous example, a configuration was specified, but in this style, an entityarchitecture pair is specified The architecture is actually optional If no architecture is specified, the last compiled architecture for the entity is used Let s take another look at the FOR clause for the first inverter, I1 In the preceding example, the component is still specified by the label or by an ALL or OTHERS clause In this example, a USE ENTITY clause follows This clause specifies the name of the entity to use for this component The entity can have a completely different name than the component being specified The component name comes from the component declaration in the architecture, while the entity name comes from the actual entity that has been compiled in the library specified Following the entity is an optional architecture name that specifies which architecture to use for the entity Notice that the OTHERS clause is used for the second inverter in this example The first inverter is configured from its label I1, and all components that have not yet been configured are configured by the OTHERS clause This capability allows component I1 to use an architecture that is different from the other components to describe its behavior This concept allows mixed-level modeling to exist One component can be modeled at the switch or gate level, and the other can be modeled at the behavior level To change the architecture used for a component with the first configuration, decode_llcon requires modifying the lower-level configuration and recompiling, then recompiling any higher-level configurations that depend on it With the second configuration decode_eacon, changing the architecture for a component involves modifying configuration decode_eacon and recompiling No other configurations need be recompiled
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