Unsupported Data Types

Some data types are either not useful for synthesis or are not supported. The following sections list and describe these unsupported data types.

“VHDL Construct Support” section of the “VHDL Constructs” chapter describes the level of Foundation Express support for each VHDL construct.

Physical Types

Foundation Express does not support physical types, such as units of measure (for example, ns).

Floating-Point Types

Foundation Express does not support floating point types, such as REAL.

Access Types

Foundation Express does not support access (pointer) types, because no equivalent hardware construct exists.

File Types

Foundation Express does not support file (disk file) types, such as a hardware file type RAM or ROM.