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Chapter 3: Tcl Packages & Commands 3–465

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use_timequest_style_escaping

Usage

use_timequest_style_escaping [-off] [-on]

Options

-off: Disable this setting.

-on: Enable this setting.

Description

Use TimeQuest-style escaping. (TimeQuest-style escaping is enabled by default.

The values used to create a collection, whether explicitly using a collection command or implicitly as a

value specified as a "-from", "-to", or similar option to various SDC and report commands, are a Tcl list of

wildcards. This includes a single name with an exact match. The value must follow standard Tcl

substitution rules for Tcl lists and "string match" as described below, unless using TimeQuest-style

escaping (default).

For special characters such as '$', the character must be escaped using a single '\' character to prevent Tcl

from interpreting the word after '$' as a Tcl variable, such as: Clk\$Signal.

A '\' character itself must be escaped with another '\' as in the '$' case, must be escaped again for the Tcl

list, and must be escaped yet again for Tcl "string match." The final result is eight '\' characters, such as:

Clk\\\\\\\\Signal.

Using Tcl "list" eliminates one level of escaping, since it will escape any '\' characters automatically for the

Tcl list, such as:

[list Clk\\\\Signal]

Using '{' and '}' characters also eliminates the need for one or two levels of escaping, since '{' and '}' prevent

string substitution in the contents, such as:

[List {Clk\\Signal}]

The use_timequest_style_escaping option, which is on by default, allows the user to specify a name

containing '\' characters with only two '\' characters in all cases, such as: Clk\\Signal. The extra '\'

characters required for Tcl list string substitution and "string match" are added automatically by

TimeQuest.

To disable TimeQuest style string escaping, call "use_timequest_style_escaping -off" before adding any

timing constraints or exceptions.

Example

project_open top

use_timequest_style_escaping -on

create_timing_netlist

set res [get_cells my_test|special_\\reg]

query_collection $res -all

delete_timing_netlist

project_close

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