Language Support

NVC supports almost all of IEEE 1076-1993 and 1076-2002. Please report any missing or incorrectly implemented features.

VHDL-2008

IEEE 1076-2008 was a major update to the VHDL standard. NVC supports many of the new features, please consult the table below.

Feature	Status
Package generics	1.6
Subprogram generics	1.7
Generic types	1.7
PSL integrated into VHDL
New fixed and floating point arithmetic packages	1.7
/* */ block comments	1.6
New standard functions minimum, maximum, to_string, etc.	1.6
Function rising_edge is defined for boolean	1.7
Arrays and records may contain unconstrained elements	1.7
New boolean_vector, integer_vector, etc. types	1.6
"Matching" case statement case?	1.7
force and release for signals	1.7
'INSTANCE_NAME etc. extended for package and subprogram instantiation	1.11
New standard environment package	1.4
New 'SUBTYPE and 'ELEMENT attributes	1.7
New condition operator ??	1.6
Enhanced bit string literals	1.6
External names	1.11
Array slices in aggregates	1.7
Conditional and selected sequential statements	1.10
Extensions to generate statement	1.8
all in sensitivity list	1.6
Context declarations	1.4
New and enhanced IEEE standard packages	1.6

VHDL-2019

IEEE 1076-2019 was another major update to the VHDL standard. NVC has experimental support for some of the new features, please consult the table below.

LCS	Feature	Status
LCS2016-001	Partially connected vectors on port map	1.11
LCS2016-002	Allow access to protected type parameters on function interfaces	1.11
LCS2016-004	Allow PT methods with AT and FT parameters	1.11
LCS2016-006a	File IO / TextIO updates	1.9
LCS2016-006c	Directory API	1.11
LCS2016-006e	Environment API	1.10
LCS2016-006f	Expose standard conditional analysis identifiers	1.9
LCS2016-007	Sequential declaration regions	1.11
LCS2016-011	Date/time functions	1.10
LCS2016-012	'IMAGE and TO_STRING for composite types	1.11
LCS2016-014	Composites of protected types
LCS2016-014a	Pointers to composites of protected types	1.10
LCS2016_015	Standard functions to report calling path	1.9
LCS2016_015a	Standard functions to report current file name	1.9
LCS2016-016	Anonymous types
LCS2016-018	Attributes for enumerated types	1.11
LCS2016-018a	New attributes - 'INDEX	1.10
LCS2016-018d	New attributes - 'DESIGNATED_TYPE	1.10
LCS2016-019	Inferring constraints from initial values for signals and variables	1.10
LCS2016-023	Relax library requirement on configurations	1.11
LCS2016-026c	Long integers	1.10
LCS2016_030	Garbage collection	1.7
LCS2016-032	PATH_NAME and INSTANCE_NAME and protected types	1.11
LCS2016-033	Composition with protected types	1.11
LCS2016-034	Protected types with generic clause
LCS2016-036a	Allow for conditional expressions in a declaration (baseline)	1.10
LCS2016-041	Record introspection/type reflection	1.11
LCS2016-043	Attributes for PSL
LCS2016-045a	Interface - defines new mode view construct for composite interface objects	1.11
LCS2016-045c	Interface - 'CONVERSE for a mode view	1.10
LCS2016-047	Protected type: shared variables on entity interface	1.10
LCS2016-049	Map generics on subprogram call
LCS2016-050	API for assert	1.11
LCS2016-055a	Syntax regularisation - component declarations	1.9
LCS2016-059	Array type generics	1.11
LCS2016-059a	Allow ordering on any scalar array	1.10
LCS2016_061	Conditional compilation	1.4
LCS2016_071a	Optional trailing semicolon	1.9
LCS2016_072b	Function knows vector size	1.10
LCS2016_075	Closely related record types	1.11
LCS2016_082	Empty record	1.9
LCS2016_086	All interface lists can be ordered	1.9
LCS2016_094a	Conditional return statement	1.10
LCS2016_099	Extended ranges