openlane/gpio_control_block/runs/gpio_control_block/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/gpio_control_block/runs/gpio_control_block/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/gpio_control_block/runs/gpio_control_block/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/gpio_control_block/runs/gpio_control_block/results/placement/gpio_control_block.placement.def
Notice 0: Design: gpio_control_block
Notice 0:     Created 24 pins.
Notice 0:     Created 163 components and 783 component-terminals.
Notice 0:     Created 79 nets and 210 connections.
Notice 0: Finished DEF file: /project/openlane/gpio_control_block/runs/gpio_control_block/results/placement/gpio_control_block.placement.def
[INFO]: Setting output delay to: 2.0
[INFO]: Setting input delay to: 2.0
[INFO]: Setting load to: 0.01765
[INFO]: Configuring cts characterization...
[INFO]: Performing clock tree synthesis...
[INFO]: Looking for the following net(s): serial_clock
 *****************
 * 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: serial_clock
 ************************
 *  Populate TritonCTS  *
 ************************
 Initializing clock nets
 Looking for clock nets in the design
 Net "serial_clock" found
 Initializing clock net for : "serial_clock"
 Clock net "serial_clock" has 15 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 serial_clock...
    Tot. number of sinks: 15
    Number of static layers: 0
 Wire segment unit: 13000 dbu (13 um)
 Original sink region: [(13160, 20340), (34305, 69300)]
 Normalized sink region: [(1.01231, 1.56462), (2.63885, 5.33077)]
    Width:  1.62654
    Height: 3.76615
 [WARNING] Creating fake entries in the LUT.
 Level 1
    Direction: Vertical
    # sinks per sub-region: 8
    Sub-region size: 1.62654 X 1.88308
    Segment length (rounded): 1
    Key: 216280 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: 15
 Clock topology of net "serial_clock" done.
 ****************
 * Post CTS opt *
 ****************
 Avg. source sink dist: 14020.5 dbu.
 Num outlier sinks: 0
 ********************
 * Write data to DB *
 ********************
 Writing clock net "serial_clock" to DB
    Created 3 clock buffers.
    Minimum number of buffers in the clock path: 2.
    Maximum number of buffers in the clock path: 2.
    Created 3 clock nets.
    Fanout distribution for the current clock = 6:1, 9:1.
    Max level of the clock tree: 1.
 ... End of TritonCTS execution.
[INFO]: Legalizing...
Warning: could not find power special net
Design Stats
--------------------------------
total instances           166
multi row instances         0
fixed instances            92
nets                       82
design area            3123.0 u^2
fixed area              245.2 u^2
movable area           1088.5 u^2
utilization                38 %
utilization padded         39 %
rows                       26
row height                2.7 u

Placement Analysis
--------------------------------
total displacement       39.1 u
average displacement      0.2 u
max displacement         11.2 u
original HPWL          4310.0 u
legalized HPWL         4336.1 u
delta HPWL                  1 %