openlane/user_proj_example/runs/user_proj_example/logs/cts/cts.log

OpenROAD 0.9.0 e582f2522b
This program is licensed under the BSD-3 license. See the LICENSE file for details. 
Components of this program may be licensed under more restrictive licenses which must be honored.
Notice 0: Reading LEF file:  /project/openlane/user_proj_example/runs/user_proj_example/tmp/merged_unpadded.lef
Notice 0:     Created 13 technology layers
Notice 0:     Created 25 technology vias
Notice 0:     Created 437 library cells
Notice 0: Finished LEF file:  /project/openlane/user_proj_example/runs/user_proj_example/tmp/merged_unpadded.lef
Warning: /home/xrex/usr/devel/pdks/sky130A/libs.ref/sky130_fd_sc_hd/lib/sky130_fd_sc_hd__tt_025C_1v80.lib, line 31 default_operating_condition tt_025C_1v80 not found.
Notice 0: 
Reading DEF file: /project/openlane/user_proj_example/runs/user_proj_example/results/placement/user_proj_example.placement.def
Notice 0: Design: user_proj_example
Notice 0:     Created 612 pins.
Notice 0:     Created 1518 components and 6703 component-terminals.
Notice 0:     Created 1015 nets and 1888 connections.
Notice 0: Finished DEF file: /project/openlane/user_proj_example/runs/user_proj_example/results/placement/user_proj_example.placement.def
Error: base.sdc, 1 can't read "::env(CLOCK_PORT)": no such variable
[INFO]: Configuring cts characterization...
[INFO]: Performing clock tree synthesis...
[INFO]: Looking for the following net(s): counter.clk
 *****************
 * TritonCTS 2.0 *
 *****************
 *****************************
 *  Create characterization  *
 *****************************
Number of created patterns = 50000.
Number of created patterns = 100000.
Number of created patterns = 150000.
Number of created patterns = 200000.
Number of created patterns = 250000.
Number of created patterns = 300000.
Number of created patterns = 313632.
 Compiling LUT
    Min. len    Max. len    Min. cap    Max. cap   Min. slew   Max. slew
           2           8           1          39           1         199
    [WARNING] 6336 wires are pure wire and no slew degration.
    TritonCTS forced slew degradation on these wires.
    Num wire segments: 216048
    Num keys in characterization LUT: 1887
    Actual min input cap: 2
 **********************
 *  Find clock roots  *
 **********************
 Running TritonCTS with user-specified clock roots: counter.clk
 ************************
 *  Populate TritonCTS  *
 ************************
 Initializing clock nets
 Looking for clock nets in the design
 Net "counter.clk" found
 Initializing clock net for : "counter.clk"
 Clock net "counter.clk" has 97 sinks
 TritonCTS found 1 clock nets.
 ****************************
 *  Check characterization  *
 ****************************
    The chacterization used 4 buffer(s) types. All of them are in the loaded DB.
 ***********************
 *  Build clock trees  *
 ***********************
 Generating H-Tree topology for net counter.clk...
    Tot. number of sinks: 97
    Number of static layers: 0
 Wire segment unit: 13000 dbu (13 um)
 Original sink region: [(36605, 25780), (188865, 224460)]
 Normalized sink region: [(2.81577, 1.98308), (14.5281, 17.2662)]
    Width:  11.7123
    Height: 15.2831
 Level 1
    Direction: Vertical
    # sinks per sub-region: 49
    Sub-region size: 11.7123 X 7.64154
    Segment length (rounded): 4
    Key: 328 outSlew: 11 load: 1 length: 4 isBuffered: 1
 Level 2
    Direction: Horizontal
    # sinks per sub-region: 25
    Sub-region size: 5.85615 X 7.64154
    Segment length (rounded): 2
    Key: 53 outSlew: 11 load: 1 length: 2 isBuffered: 1
 [WARNING] Creating fake entries in the LUT.
 Level 3
    Direction: Vertical
    # sinks per sub-region: 13
    Sub-region size: 5.85615 X 3.82077
    Segment length (rounded): 1
    Key: 216289 outSlew: 11 load: 1 length: 1 isBuffered: 1
 Stop criterion found. Max number of sinks is (15)
 Building clock sub nets...
 Number of sinks covered: 97
 Clock topology of net "counter.clk" done.
 ****************
 * Post CTS opt *
 ****************
 Avg. source sink dist: 35727.2 dbu.
 Num outlier sinks: 0
 ********************
 * Write data to DB *
 ********************
 Writing clock net "counter.clk" to DB
    Created 15 clock buffers.
    Minimum number of buffers in the clock path: 4.
    Maximum number of buffers in the clock path: 4.
    Created 15 clock nets.
    Fanout distribution for the current clock = 8:2, 10:2, 13:1, 14:1, 16:1, 18:1.
    Max level of the clock tree: 3.
 ... End of TritonCTS execution.
[INFO]: Legalizing...
Warning: could not find power special net
Design Stats
--------------------------------
total instances          1533
multi row instances         0
fixed instances           846
nets                     1030
design area           53897.9 u^2
fixed area             1473.9 u^2
movable area           7409.6 u^2
utilization                14 %
utilization padded         14 %
rows                       83
row height                2.7 u

Placement Analysis
--------------------------------
total displacement      108.7 u
average displacement      0.1 u
max displacement         18.7 u
original HPWL         49156.0 u
legalized HPWL        49158.7 u
delta HPWL                  0 %