Technical data

GUI_expression_format

ModelSim EE/PLUS Reference Manual ModelSim EE Graphic Interface

237

The enumeration types supported are any VHDL enumerated type. Enumeration

literals may be used in the expression as long as some variable of that enumeration

type is referenced in the expression. This is useful for subexpressions of the form:

(/memory/state == reading)

Groupin

and precedence

Operator precedence generally follows that of the C language, but we recommend

liberal use of parentheses.

Savin

expressions

Expressions created in the expression builder dialog box can be saved for future

use by pressing the SAVE button. You will be prompted for the name of a global-

level Tcl variable, to be assigned the expression string. After entering the variable

name, the expression will be saved. Regardless of whether you enter a Tcl variable

name or not, the expression will also be saved in the entry box drop-down cache.

A previous entry in the cache can be selected by simply clicking with the mouse.

Expression syntax

GUI expressions generally follow C-language syntax, with both VHDL-specific

and Verilog-specific conventions supported. These expressions are not parsed by

the Tcl parser, and so do not support general Tcl; parentheses should be used

rather than curly braces. Procedure calls are not supported.

A GUI expression can include the following elements:

Tcl macros

Macros are useful for pre-defined constants or for entire expressions that have

been previously saved. The substitution is done only once, when the expression is

first parsed. Macro syntax is:

$<name>

Substitutes the string value of the Tcl global variable <name>.