VHDL Glossary | |
IEEE Std
1076-2002 - IEEE Standard VHDL Language Reference Manual, Copyright © 2006 by the
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| There are 19 entries in the glossary. | |
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| Term | Definition |
| Parameter | A constant, signal, variable, or file declared in the interface list of a subprogram specification. The characteristics of the class of objects to which a given parameter belongs are also characteristics of the parameter. In addition, a parameter has an associated mode that specifies the direction of data flow allowed through the parameter. |
| Parameter and result type profile | Two subprograms that have the same parameter type profile, and either both are functions with the same result base type, or neither of the two is a function. |
| Parameter interface list | An interface list that declares the parameters for a subprogram. It may contain interface constant declarations, interface signal declarations, interface variable declarations, interface file declarations, or any combination thereof. |
| Parameter type profile | Two formal parameter lists that have the same number of parameters, and at each parameter position the corresponding parameters have the same base type. |
| Parent | A process or a subprogram that contains a procedure call statement for a given procedure or for a parent of the given procedure. |
| Passive process | A process statement where neither the process itself, nor any procedure of which the process is a parent, contains a signal assignment statement. |
| Physical literal | A numeric literal of a physical type. |
| Physical type | A numeric scalar type that is used to represent measurements of some quantity. Each value of a physical type has a position number that is an integer value. Any value of a physical type is an integral multiple of the primary unit of measurement for that type. |
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| Port | A channel for dynamic communication between a block and its environment. A signal declared in the interface list of an entity declaration, in the header of a block statement, or in the interface list of a component declaration. In addition to the characteristics of signals, ports also have an associated mode; the mode constrains the directions of data flow allowed through the port. |
| Port interface list | An interface list that declares the inputs and outputs of a block, component, or design entity. It consists entirely of interface signal declarations. |
| Positional association | An association element that does not contain an explicit appearance of the formal designator. An actual designator at a given position in an association list corresponds to the interface element at the same position in the interface list. |
| Postponed process | An explicit or implicit process whose source statement contains the reserved word postponed. When a postponed process is resumed, it does not execute until the final simulation cycle at the current modeled time. Thus, a postponed process accesses the values of signals that are the “stable” values at the current simulated time. |
| Predefined operators | Implicitly defined operators that operate on the predefined types. Every predefined operator is a pure function. No predefined operators have named formal parameters; therefore, named association cannot be used in a function whose name denotes a predefined operation. |
| Primary | One of the elements making up an expression. Each primary has a value and a type. |
| Projected output waveform | A sequence of one or more transactions representing the current and projected future values of the driver. |
| Protected type | A type whose objects are protected from simultaneous access by more than one process. |
| Pulse rejection limit | The threshold time limit for which a signal value whose duration is greater than the limit will be propagated. A pulse rejection limit is specified by the reserved word reject in an inertially delayed signal assignment statement. |
| Pure function | A function that returns the same value each time it is called with the same values as actual parameters. An impure function may return a different value each time it is called, even when different calls have the same actual parameter values. |
| Glossary & Definitions | |