VHDL Glossary | |
IEEE Std
1076-2002 - IEEE Standard VHDL Language Reference Manual, Copyright © 2006 by the
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| There are 8 entries in the glossary. | |
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| Term | Definition |
| Unaffected | A waveform in a concurrent signal assignment statement that does not affect the driver of the target. |
| Unassociated formal | A formal that is not associated with an actual. |
| Unconstrained subtype | A subtype that corresponds to a condition that imposes no restriction. |
| Unit name | A name defined by a unit declaration (either the primary unit declaration or a secondary unit declaration) in a physical type declaration. |
| Universal_integer | An anonymous predefined integer type that is used for all integer literals. The position number of an integer value is the corresponding value of the type universal_integer. |
| Universal_real | An anonymous predefined type that is used for literals of floating point types. Other floating point types have no literals. However, for each floating point type there exists an implicit conversion that converts a value of type universal_real into the corresponding value (if any) of the floating point type. |
| Update | An action on the value of a signal, variable, or file. The value of a signal is said to be updated when the signal appears as the target (or a component of the target) of a signal assignment statement (indirectly); when it is associated with an interface object of mode out, buffer, inout, or linkage; or when one of its subelements (individually or as part of a slice) is updated. The value of a signal is also said to be updated when it is a subelement or slice of a resolved signal, and the resolved signal is updated. The value of a variable is said to be updated when the variable appears as the target (or a component of the target) of a variable assignment statement (indirectly), when it is associated with an interface object of mode out or linkage, or when one of its subelements (individually or as part of a slice) is updated. The value of a file is said to be updated when a WRITE operation is performed on the file object. |
| Upper bound | For a range L to R or L downto R, the larger of L and R. |
| Glossary & Definitions | |