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Chapter 3: Tcl Packages & Commands 3–387
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© July 2013 Altera Corporation Quartus II Scripting Reference Manual
enable_ccpp_removal
Usage
enable_ccpp_removal [-depth <depth>] [-off] [-on]
Options
-depth <depth>: maximum clock tree depth for cppp removal
-off: Disable this setting.
-on: Enable this setting.
Description
Enables (or disables) common clock path pessimism (CCPP) removal during slack computation. CCPP
removal can improve timing results by removing min/max delay differences from common portions of
clock paths. Enabling CCPP removal increases the time required to perform timing analysis.
When specified, the optional depth parameter limits the clock tree depth used for CCPP removal. This is
generally not applicable to FPGA compilations where the clock tree is fixed, but for large HardCopy
designs with potentially deep synthesized clock trees this can reduce outlier run time.
When not specified, or when specified with a value of 0, the complete clock tree is used for CCPP removal
(i.e. full clock-tree depth).
Example
project_open top
create_timing_netlist
read_sdc
# Report timing without CCPP removal
report_timing
# Enable CCPP removal and re-report timing.
enable_ccpp_removal
report_timing
delete_timing_netlist
project_close
- 101 Innovation Drive 1
- San Jose, CA 95134 1
- MNL-Q2101904-9.1.1 2
- Contents 3
- Contents v 5
- Contents vii 7
- Contents ix 9
- Contents xi 11
- Contents xiii 13
- Contents xv 15
- About this Reference Manual 17
- Typographic Conventions 18
- Reference Manual 19
- Command-Line Executables 20
- Overview 21
- Tcl Commands 23
- Quartus_sta 24
- Quartus_staw 24
- Tcl Console 24
- Related Documentation 25
- 2. Command-line Executables 27
- --generate_hc_files 33
- --generate_hc_pll_delay 33
- --hc_min_archive 34
- --hc_ready 34
- --hc_review 35
- --post_map[=on 40
- --update_mif 41
- --vqm[=<.vqm file>] 41
- --write_rcf_for_vqm[=on 41
- --operation=<pb 45
- --option=<filename> 45
- --voltage=<voltage> 46
- String Description 47
- Examples 50
- --post_syn[=on 52
- --rtl[=on 52
- --hc[=on 52
- --post_fit[=on 52
- --board_symbol[=on 55
- --board_timing[=on 55
- --format=<NONE> 55
- --gen_script=<NONE> 56
- --gen_testbench 56
- --glitch_filtering[=on 56
- --resynthesis[=on 56
- --simulation[=on 57
- --timing_analysis[=on 57
- --vcd_type=<NONE> 59
- --check_ios 61
- --check_netlist 61
- --fmax=<time unit> 62
- --incremental_signaltap 62
- --inner_num=<value> 62
- --io_smart_recompile 63
- --one_fit_attempt[=on 63
- --part=<device part> 63
- --seed=<value> 64
- --signalprobe 64
- --tdc[=on 64
- --compress 67
- -a=<action to perform> 68
- --enumerate_hardware 70
- --loquacious 70
- --lib_path=<path> 74
- --parallel[=on 74
- --part=<device> 74
- --partition=<NONE> 74
- --source=<source file> 75
- --update_wysiwyg_parameters 75
- --verilog_macro=<NONE> 75
- --haltcc 78
- --initcfg 78
- --estimate_power[=on 81
- --no_input_file 82
- --archive 85
- --determine_smart_action 86
- --prepare 92
- --qboard 92
- --qinstall 93
- --qslave 93
- --relcon 94
- --restore 94
- --simlib_comp 95
- -g[=on 98
- --bank=<bank index> 98
- --grouping[=on 99
- --sso_inputs[=on 99
- Value Description 102
- --report_script=<NONE> 107
- --sdc=<NONE> 107
- --speed=<NONE> 107
- --voltage=<value_in_mV> 108
- --create_signaltap_hdl_file 110
- -c=<revision name> 110
- --combined_model[=on 114
- --create_timing_netlist 114
- --delay_annotation_only 114
- --tao[=<.tao file>] 116
- --tao_summary 116
- --tco=<time unit> 116
- --th=<time unit> 116
- --timing_analysis_only 116
- --tpd=<time unit> 117
- --tristate 117
- --tsu=<time unit> 117
- --zero_ic_delays 117
- -f=<argument file> 118
- --help[=<option 119
- --lower_priority 119
- --version 119
- Common Options 120
- Return Code Description 121
- 0 Execution was successful 121
- --rev=<revision name> 122
- -p[=on 123
- Settings File Options 124
- 2. Compiler database 127
- -t=<script file> 128
- --script=<script file> 128
- Tcl Options 129
- ■ quartus_tan 141
- Description 145
- ■ quartus 159
- ■ quartus_cdb 159
- <position>: Position 182
- <device>: Device name 225
- <family>: Family name 226
- <part>: Part name 227
- ■ quartus_sh 234
- ■ quartus_sta 234
- ■ quartus_stp 254
- # Close device 279
- $bus_name 298
- # Disables natural bus naming 298
- <command>: Command 311
- ■ export_assignments 317
- ## Close the project if open 350
- project_close 350
- # Using wildcards 358
- TSU_REQUIREMENT 2ns 368
- ■ quartus_map 401
- as an absolute time shift 418
- ■ quartus_sim 474
- Example 12 479
- Example 13 479
- Example 14 479
- Example 15 479
- Example 16 479
- Example 3 490
- Example 4 490
- Groups the specified signals 494
- -phase] [-rise] 523
- Option Destination Tool 551
- -chip Chip Planner 551
- -rpe Resource Property Editor 551
- -tmv Technology Map Viewer 551
- 0.100 -detail full_path 570
- (empty) Unknown transition 584
- R Rising output 584
- F Falling output 584
- Reports unconstrained paths 591
- MHz MegaHertz 625
- GHz GigaHertz 625
- Time Unit Description 625
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