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Three types of names exist in AHDL:
Symbolic names are user-defined identifiers in AHDL. They are used to name the following parts of a Text Design File (.tdf):
Internal and external nodes and groups
Constants
State machine names, state bits, and state names
Instances
Parameters
Memory segments
Named operators
Subdesign names are user-defined names for lower-level design files. The subdesign name must be the same as the TDF file name.
Port names are symbolic names that identify the input or output of a logic function.
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Compiler-generated names that contain the tilde (~) character may appear in the compilation database for a project. If you back-annotate the assignments in the database, these names appear in the project's Compiler Settings File (.csf). The tilde character is reserved for Compiler-generated names only; you cannot use it in your own pin, node, and group names. |
Two notations are available for subdesign, symbolic, and port names: quoted and unquoted. Quoted names are enclosed in single quotation marks ('); unquoted names are not.
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When you create a default symbol for a TDF that includes quoted port names, the quotes are not included in the pinstub names shown in the symbol. |
Subdesign, symbolic, and port names have the following characteristics:
| Legal Name Characters Note 1 | Unquoted Subdesign Name | Quoted Subdesign Name | Unquoted Symbolic Name | Quoted Symbolic Name | Unquoted Port Name | Quoted Port Name |
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A-Z |
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a-z |
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0-9 |
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Underscore (_) |
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Slash (/) |
No | No | |
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Dash (-) |
No | |
No | |
No | |
Digits only (0-9) |
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No | |
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| Keyword | No | |
No | |
No | |
| Identifier | No | |
No | No | No | |
Example of Unquoted Symbolic Names
Example of Quoted Symbolic Names
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