Achronix ACE Version 5.0 - Manual (Page 380)

set placement Chapter 5. Tcl Command Reference
or in easier way user can use for loop in SDC file
for {set i 0} {$i < <bus_width>} {incr i} {
set_output_delay 0 <port_pin_list\[$i\]> -combinational
}
For example in user design an output pins (abus [18:0]) are defined as 19-bit bus. Instead of using 19-line
with bit-split user can use this above sample. Below is the example how to define 19-bit bus inside the SDC
file:
for {set i 0} ($i < 19) {incr i} {
set_output_delay 0 abus\[$i\] -combinational
}
User can also set the constraint on the output pin with respect to clock. Below is the example how to do this
in the SDC constraint file
set_output_delay 0 <port_pin_list> -clock <clock_name>
or
set_output_delay 0 {<port_pin_list[bit_value_of_bus]>} -clock <clock_name>
set placement
set placement < objName > < siteName > [-fixed] [-batch]
Pre-placement command to assign the initial placement of an instance to a site
Argument Required/Optional Description
< objName > Required The required <objName>
argument is used to specify the
instance (i:) or port (p:) to set
placement for. If multiple objects
are to be placed at once, a TCL list
of objects may be specified.
< siteName > Required The required <siteName>
argument is used to specify the
site (s:) to place the instance on. In
the case of IO placement, a ball
(b:) name or device port name (d:)
may be specified instead of a site
name. If multiple objects are to be
placed at once, a TCL list of
objects may be specified.
[-fixed] Optional The optional -fixed option
specifies whether the placement of
the instance should be fixed to this
site through final placement, or
whether the placement of this
instance should be used as a hint
for the detailed placer.
UG001 Rev. 5.0 - 5th December 2012 http://www.achronix.com 368