Achronix ACE Version 5.0 Manuel d'utilisateur télécharger pdf (Page 379)

set output delay Chapter 5. Tcl Command Reference

Argument Required/Optional Description

slew Required slew value

port pin list Required port pin list (one or more ports)

set load

set load load port pin list

Specify an output load/capacitance constraint

Argument Required/Optional Description

load Required cap value

port pin list Required port pin list (one or more ports)

set max ﬂyline fanout

set max flyline fanout <limit>

This command is used to hide selected instance ﬂylines for nets with fanout greater than the limit passed in.

Argument

Required/Optional Description

<limit>

Required The required <limit> argument

speciﬁes the maximum fanout for

ﬂylines to be displayed for a net.

set output delay

set output delay delay port pin list [-clock <arg>] [-combinational]

Specify an output delay constraint or clock

Argument Required/Optional Description

delay Required delay value (Note: this value is currently ignored)

port pin list Required port pin list (one or more ports)

[-clock <arg>] Optional clock name

[-combinational] Optional use combinational domain

This command speciﬁes an output delay constraint using a structure speciﬁed by user directives that have

been applied to the design prior to run prepare.

For example user wants to use an output pin as a combinational pin, which is not registered output; below

is the example how to set the output delay inside the SDC ﬁle:

set_output_delay 0 <port_pin_list> -combinational

If the user design has input pins deﬁned as bus. Then in this case user needs to split the bus into a bit and

use the following constraint inside the SDC ﬁle:

set_output_delay 0 {<port_pin_list[bit_value_of_bus]>} -combinational

367 http://www.achronix.com UG001 Rev. 5.0 - 5th December 2012

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Achronix ACE Version 5.0 Manuel d'utilisateur Page 379