Certain language constructs are not supported by the Vivado simulator. The following table lists the VHDL language support exceptions.
Supported VHDL Construct | Exceptions |
---|---|
abstract_literal
|
Floating point expressed as based literals are not supported. |
alias_declaration
|
Alias to non-objects are in general not supported; particularly the following:
|
alias_designator
|
Operator_symbol as alias_designator Character_literal as alias_designator |
association_element
|
Globally, locally static range is acceptable for taking slice of an actual in an association element. |
attribute_name
|
Signature after prefix is not supported. |
binding_indication
|
Binding_indication without use of entity_aspect is not supported. |
bit_string_literal
|
Empty bit_string_literal (" ") is not supported. |
block_statement
|
Guard_expression is not supported; for example, guarded blocks, guarded signals, guarded targets, and guarded assignments are not supported. |
choice
|
Aggregate used as choice in case statement is not supported. |
concurrent_assertion_statement
|
Postponed is not supported. |
concurrent_signal_assignment_statement
|
Postponed is not supported. |
concurrent_statement
|
Concurrent procedure call containing wait statement is not supported. |
conditional_signal_assignment
|
Keyword guarded as part of options is not supported as there is no supported for guarded signal assignment. |
configuration_declaration
|
Non locally static for generate index used in configuration is not supported. |
entity_class
|
Literals, unit, file, and group as entity class are not supported. |
entity_class_entry
|
Optional <> intended for use with group templates is not supported. |
file_logical_name
|
Although file_logical_name is allowed to be any wild expression evaluating to a string value, only string literal and identifier is acceptable as file name. |
function_call
|
Slicing, indexing, and selection of formals is not supported in a named parameter association within a function_call . |
instantiated_unit
|
Direct configuration instantiation is not supported. |
mode
|
Linkage and Buffer ports are not supported completely. |
options
|
Guarded is not supported. |
primary
|
At places where primary is used, allocator is expanded there. |
procedure_call
|
Slicing, indexing, and selection of formals is not supported in a named parameter association within a procedure_call . |
process_statement
|
Postponed processes are not supported. |
selected_signal_assignment
|
The guarded keyword as part of options is not supported as there is no support for guarded signal assignment. |
signal_declaration
|
The signal_kind is not supported. The signal_kind is used for declaring guarded signals, which are not supported. |
subtype_indication
|
Resolved subtype of composites (arrays and records) is not supported. |
waveform
|
Unaffected is not supported. |
waveform_element
|
Null waveform element is not supported as it only has relevance in the context of guarded signals. |