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set extra delay Chapter 5. Tcl Command Reference

[-wt <arg>]

Optional Optional 2nd level cluster weight

2, . . . , 5 - higher weights signify

cluster importance

This clustering command directs the placer to keep the instances (listed in the command) together. For loops

and long paths of reconvergent paths, the tool knows to focus on placing these instances together, yielding

better results.

set default relation

set default relation [-none] [-false path] [-related]

Specify default when a needed clock relation is not speciﬁed.

Argument Required/Optional Description

[-none] Optional do not infer a relation (default)

[-false path] Optional assume set false path

[-related] Optional infer relation from period

speciﬁed with create clock;

otherwise false path

set extra delay

set extra delay <pinlist>

This command parses the user directive to add extra gate delays for reconvergent (skewed) paths.

Argument

Required/Optional Description

Required The required pinlist option is used to

specify the load pins of a net that need

to be driven by inserted gates. For each

pin, you can optionally specify an

integer delay value by using the format

<delay>,<pin name>. The default

delay value is 1.

Elaboration

This command will insert delays using a structure speciﬁed by user directives that have been applied to the

design prior to run prepare.

1 s e t e x t r a d e l a y { < p i n l i s t > }

where

1 <p i n l i s t > : = ’ { ’ pin1 pin2 pin3 . . . . ’ } ’

The lists are TCL lists of pins on the same net. Note that each pin in <pinlist> should be separated by a

space.

It is an error to specify a set of pins that are not on the same net.

It is not necessary to list all target pins of the net. All pins not speciﬁed are assumed to be at the ﬁrst level.

Each level of the list corresponds to a ”buffer” to be inserted on the path to the pin. The buffer is

implemented by a LUT.

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Achronix ACE Version 5.0 Manual de usuario Pagina 374