OpenDP: Open-Source Detailed Placement Engine
Visualized detailed placement result using aes_cipher_top design with Innovus initial placement; doc/OpenDP.jpg |
Features:
The detailed_placement
command performs detailed placement of instances
to legal locations after global placement.
set_placement_padding -global|-instances insts|-masters masters
[-left pad_left] [-right pad_right]
detailed_placement [-max_displacement disp|{disp_x disp_y}]
check_placement [-verbose]
filler_placement [-prefix prefix] filler_masters
optimize_mirroring
The set_placement_padding
command sets left and right padding in multiples
of the row site width. Use the set_placement_padding
command before
legalizing placement to leave room for routing. Use the -global
flag
for padding that applies to all instances. Use -instances
for instance-specific padding. The instances insts
can be a list of instance
names, or an instance object returned by the SDC get_cells
command. To
specify padding for all instances of a common master, use the -filter
"ref_name == " option to get_cells
.
The set_power_net
command is used to set the power and ground special
net names. The defaults are VDD
and VSS
.
The -max_displacement
argument to detailed_placement
specifies how
far an instance can be moved when finding a site where it can be placed. The default values are
{500 100}
sites. The x/y displacement arguments are in microns.
The check_placement
command checks the placement legality. It returns
0
if the placement is legal.
The filler_placement
command fills gaps between detail-placed instances
to connect the power and ground rails in the rows. filler_masters
is a
list of master/macro names to use for filling the gaps. Wildcard matching
is supported, so FILL*
will match, e.g., FILLCELL_X1 FILLCELL_X16 FILLCELL_X2 FILLCELL_X32 FILLCELL_X4 FILLCELL_X8
. To specify a different naming prefix
from FILLER_
use -prefix <new prefix>
.
The optimize_mirroring
command mirrors instances about the Y axis in
a weak attempt to reduce total wirelength (HPWL).
Check out GitHub discussion about this tool.
BSD 3-Clause License. See LICENSE file.
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