| Item |
Name Character Exception |
| file name |
No slash (/) is permitted. Case is significant on UNIX and Linux workstations; all file names should be in lowercase letters. Case is also significant in Verilog HDL files. |
| single-range group (bus) name |
No slash (/) is permitted; the bus identifier cannot end with a digit. The name is followed by a range of numbers or arithmetic expressions in brackets. The start and end of the range are separated by two periods. For example, group a[3..1] consists of the nodes a3, a2, and a1. In Block Editor files only, sequential bus names can also include a series of single-range bus names. For example, a[8..0],dout[6..4]. |
| dual-range group (bus) name |
Same as single-range group names, with two ranges of numbers or arithmetic expressions in brackets. For example, a[6..3][4..0]. |
| sequential group (bus) name |
The name consists of a series of comma-separated node names enclosed in parentheses. For example, group (a, b, c) consists of the nodes a, b, and c. In Block Editor files, parentheses are not used. |
| unquoted symbolic name (AHDL) |
No dash (-) is permitted. Names cannot consist entirely of digits. AHDL keywords cannot be used. |
| Verilog HDL identifiers |
No slash (/) or dash (-) is permitted. Dollar signs ($) are permitted. Names cannot begin with a digit or $. Case is significant. Verilog HDL keywords cannot be used. |
| VHDL names |
No slash (/) or dash (-) is permitted. The name must start with a letter, cannot end with an underscore (_), and cannot contain two underscores (_ _) in a row. VHDL keywords cannot be used. |
