Achronix ACE Version 5.0 - Manual (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