Answers Database

M1.4 Concept: How to place a TIG property on a net in your schematic


Record #3820

Product Family:  Software

Product Line:  Cadence

Problem Title:
M1.4 Concept: How to place a TIG property on a net in your schematic


Problem Description:
Keywords: TIG, property, Concept, Timing Ignore

Urgency: Standard

General Description: This solution describes the method to place a TIG
(Timing Ignore) property on a Cadence Concept schematic net in order to
tell the M1 tools to ignore this path for timing driven placement and
routing.


Solution 1:


Before placing a TIG property or any property in your schematic, it is
suggested to display both the property name and value within the
schematic by changing the following setting from either the
startup.concept file or typing this command from the Concept command
window:

SET PROP_DISPLAY BOTH

The default behavior is to show the property value only.


A TIG property can be specified to either ignore a single timing
constraint or to ignore all timing constraints.

To ignore a single timing constraint, place the following property on the
desired net:

TIG=TS01

In this case, the Timespec TS01 is specified as the timespec to be
ignored but this can be replaced with the timespec name which is wished
to be ignored.


To ignore all timing constraints on a net, place the following property
on the desired net (including the quotes):

TIG=""

A null or empty string is used to ignore all timing constraints and since
a value is required for a property within Concept this is repesented by
the empty quotes.



End of Record #3820