VHDL Glossary | |
IEEE Std
1076-2002 - IEEE Standard VHDL Language Reference Manual, Copyright © 2006 by the
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| There are 17 entries in the glossary. | |
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| Term | Definition |
| Range | A specified subset of values of a scalar type. |
| Range constraint | A construct that specifies the range of values in a type. A range constraint is compatible with a subtype if each bound of the range belongs to the subtype or if the range constraint defines a null range. The direction of a range constraint is the same as the direction of its range. |
| Read | The value of an object is said to be read when its value is referenced or when certain of its attributes are referenced. |
| Real literal | An abstract literal of the type universal_real that contains a base point. |
| Record type | A composite type whose values consist of named elements. |
| Reference | Access to a named entity. Every appearance of a designator (a name, character literal, or operator symbol) is a reference to the named entity denoted by the designator, unless the designator appears in a library clause or use clause. |
| Register | A kind of guarded signal that retains its last driven value when all of its drivers are turned off. |
| Regular structure | Instances of one or more components arranged and interconnected (via signals) in a repetitive way. Each instance may have characteristics that depend upon its position within the group of instances. Regular structures may be represented through the use of the generate statement. |
| Resolution | The process of determining the resolved value of a resolved signal based on the values of multiple sources for that signal. |
| Resolution function | A user-defined function that computes the resolved value of a resolved signal. |
| Resolution limit | The primary unit of type TIME (by default, 1 femtosecond). Any TIME value whose absolute value is smaller than this limit is truncated to zero (0) time units. |
| Resolved signal | A signal that has an associated resolution function. |
| Resolved value | The output of the resolution function associated with the resolved signal, which is determined as a function of the collection of inputs from the multiple sources of the signal. |
| Resource library | A library containing library units that are referenced within the design unit being analyzed. |
| Result subtype | The subtype of the returned value of a function. |
| Resume | The action of a wait statement upon an enclosing process when the conditions on which the wait statement is waiting are satisfied. If the enclosing process is a nonpostponed process, the process will subsequently execute during the current simulation cycle. Otherwise, the process is a postponed process, which will execute during the final simulation cycle at the current simulated time. |
| Right of | When a value V1 and a value V2 belong to a range and either the range is an ascending range and V2 is the predecessor of V1, or the range is a descending range and V2 is the successor of V1. |
| Glossary & Definitions | |