482 lines
14 KiB
Plaintext
482 lines
14 KiB
Plaintext
OpenSTA Timing Analyzer Release Notes
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-------------------------------------
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This file summarizes user visible changes for each release.
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2026/02/24
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----------
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The define_scene -library argument now takes a the library name or a
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library filename. If a filename is used, it must be the same as the
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filename used to read the library with read_liberty.
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Release 3.0.0 2025/11/26
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------------------------
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This release adds multi-corner multi-mode (mcmm) support. The SDC
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constraints in each mode describe a different operating mode, such as
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mission mode or scan mode.
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A "scene" is the combination of a mode and corner. Each scene can have
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separate min/max liberty and spef files.
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THe basic structure of a multi-corner/multi-mode command file is
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read_liberty
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read_verilog
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link_design
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read_sdc -mode... or set_mode followed by sdc commands
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read_spef -name...
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define_scene...
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report_checks [-scenes]
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This is an example script with 2 corners, 2 modes and 3 scenes.
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read_liberty bc.lib
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read_liberty wc.lib
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read_verilog design.v
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link_design top
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read_sdc -mode run design.sdc
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read_sdc -mode scan design_scan.sdc
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read_spef -name bc bc.spef
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read_spef -name wc wc.spef
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define_scene bc \
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-mode run \
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-liberty bc \
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-spef bc
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define_scene wc \
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-mode run \
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-liberty wc \
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-spef wc
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define_scene scan \
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-mode scan \
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-liberty wc \
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-spef wc
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report_checks
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report_checks -scenes bc
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report_checks -scenes wc
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report_checks -scenes scan
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................
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Alternatively, the set_mode command can be used to define commands
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for each mode at the command level instead of using SDC files.
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set_mode run
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create_clock -period 10 clock
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set_input_delay 0 -clock clock [all_inputs -no_clocks]
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set_output_delay 0 -clock clock [all_outputs]
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set_mode scan
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create_clock -period 100 scan_clock
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set_input_delay 0 -clock scan_clock scan_in
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set_output_delay 0 -clock scan_clock scan_out
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................
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The define_corners command is supported for compatiblity but should
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not be used with mcmm flows. Similarly, the -min/-max arguemnts to
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read_liberty and read_spaf are supported for compabibility but should
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not be used with mcmm flows.
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................
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An initial mode and scene named "default" are defined for single mode,
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single corner analysis. SDC commands defined interactively and read
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with read_sdc without a -mode argument are defined in the "default"
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mode.
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Use the set_mode command to define a mode or set the command
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interpreter to add following commands to mode mode_name.
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set_mode mode_name
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If mode_name does not exist it is created. When modes are created the
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default mode is deleted.
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The read_sdc command has a -mode argument to assign the commands in the file
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to a mode.
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read_sdc [-mode mode_name]
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If the mode does not exist it is created. Multiple SDC files can
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append commands to a mode by using the -mode_name argument for each
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one. If no -mode arguement is is used the commands are added to the
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current mode.
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................
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The define_scene command defines a scene for a mode (SDC), liberty files
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and spef parasitics.
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define_scene -mode mode_name
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-liberty liberty_files | -liberty_min liberty_min_files -liberty_max liberty_max_files
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[-spef spef_file | -spef_min spef_min_file -spef_max spef_max_file]
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Use get_scenes to find defined scenes.
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get_scenes [-modes mode_names] scene_name
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................
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Use the read_spef -name argument to append multiple parasitics files
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to annotate hierarchical blocks. Scene definitions use the spef_name
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to specify which parasitices to use for each scene.
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read_spef -name spef_name
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report_parasitic_annotation [-name spef_name]
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If -name is omitted the base name of the file name is used.
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The read_spef -corner/-min/-max arguments are supported for comppatibility
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but will be removed in a future release.
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The read_spef -reduce options don't work because sdc, liberty ap isn't known
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................
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The report_checks and report_check_typescommands support a -scenes
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argument to report timing checks/paths from multiple scenes.
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report_checks -scenes
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report_check_types -scenes
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report_slews -scenes
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report_clock_latency -scenes
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................
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To annotate delays with SDF when there are multiple scenes, use
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the -scene argument.
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read_sdf -scene
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report_annotated_delay -scene
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report_annotated_check -scene
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SDF annotation for mcmm analysis must follow the scene definitions.
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................
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VCD annotation with read_vcd now supports a -mode arguement.
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read_vcd [-mode mode_name]
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................
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The -corner args has been removed from the following commands because they are no
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longer necessary.
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set_load -corner
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set_port_fanout_number -corner
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................
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The report_pulse_width_checks command is no longer supported. Use
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report_check_types -min_pulse_width.
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................
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Delay calculation slew values now propagate through set_case_analysis
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and set_logic_zero, set_logic_one, set_logic_dc constraints.
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Power analysis now ignores set_case_analysis and set_logic_zero,
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set_logic_one, set_logic_dc.
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Release 2.7.0 2025/05/19
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-------------------------
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The OpenSTA library `libOpenSTA` and `sta` executable are now built in the
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build directory instead of `app/`.
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The set_max_delay and set_min_delay commands now support the -probe option.
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With -probe these commands do not break paths at internal (non-startpoint) pins.
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The report_checks command now supports a -unique_edges_to_endpoint option
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to remove paths through identical pins and rise/fall edges.
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report_checks [-unique_edges_to_endpoint]
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Instances now have pins for verilog netlist power/ground connections,
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Sta::findPathEnds group_paths arg has been changed from PathGroupNameSet*
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to StringSeq&.
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Release 2.6.1 2025/03/30
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-------------------------
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The -list_annotated and -list_not_annotated arguments to the
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report_annotated_delay and report_annotated_check commands have been renamed to
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-report_annotated and -report_unannotated.
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The Tcl "source" command is no longer redefined to support "-echo" and
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"-verbose" arguments and redirecton. Use the "include" command instead.
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include [-echo] [-verbose] filename [> filename] [>> filename]
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-echo echos commands as they are read
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-verbose prints command results as they are evaluated
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Unlike the Tcl source command, "include" expands filenames with tilda '~'
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and respects sta_continue_on_error.
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Release 2.6.0 2024/07/22
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-------------------------
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The version of c++ used by OpenSTA is now 17.
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The Cudd BBD packager is now required.
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The USE_TCL_READLINE option defaults to ON.
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The variable link_make_black_boxes has been removed.
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Use the -no_black_boxes option to the link_design command.
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link_design [-no_black_blocks] [top_cell_name]
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The all_inputs command now supports -no_clocks to remove clocks
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inputs from the returned list.
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all_inputs [-no_clocks]
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The read_power_activities command has been deprecated. Use read_vcd instead.
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read_vcd [-scope scope] filename
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The Switching Activity Interchange Format (SAIF) for reading power activities
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is now supported by the the read_saif command.
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read_saif [-scope scope] filename
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The report_checks -group_count option has been renamed to -group_path_count.
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The report_checks -endpoint_count option has been renamed to -endpoint_path_count.
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The report_checks -field hierarchical_pins field reports hierarchical pins between
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a driver and a load in the path report.
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The suppress_msg and unsuppress_msg commands allow suppression/unsuppression of
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warnings/errors by ID. Message IDs can be found in doc/messages.txt.
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Release 2.5.0 2024/01/17
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-------------------------
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The report_net -connections, -verbose and -hier_pins flags are deprecated.
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The report_instance -connections and -verbose flags are deprecated.
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The options are now enabled in all cases.
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The read_spef parasitic reduction arguments have changed. The
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-reduce_to and -delete_after_reduce arguments are deprecated and
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replaced with the -reduce flag. With the -reduce flag, the current
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delay calculator reduces the parastic network to the appropriate type
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and deletes the parasitic network.
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The report_clock_skew and report_clock_latency commands now supports
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the -include_internal_latency flag to control inclusion of macro
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internal clock delays from the cell liberty min/max_clock_tree_path
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timing groups.
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report_clock_skew -include_internal_latency
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report_clock_latency -include_internal_latency
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The report_clock_skew requires a -scene argument if multiple scenes are defined.
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The all_inputs command now supports the -no_clocks argument to exclude
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clocks from the list.
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all_inputs [-no_clocks]
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The report_activity_annotation command reports power activity annotaton
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from vcd, saif or the set_input_activity command.
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report_activity_annotation [-report_unannotated] [-report_annotated]
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Release 2.4.0 2023/01/19
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-------------------------
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The report_parasitics_annotation command reports SPEF annotation completeness.
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report_parasitics_annotation [-report_unannotated]
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The read_power_activities command reads a verilog vcd file and extracts
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pin activities for power analysis.
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read_power_activities -vcd filename
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The report_cell command has been removed; use report_instance.
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The read_liberty command latch inference (see OpenSTA.pdf) is now disabled by default.
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The -no_latch_infer flag is deprecated.
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To enable latch inference, use the -infer_latches flag.
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The report fanout and capacitance fields are now shown on output pin lines rather
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than net lines.
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Release 2.3.3 2022/09/24
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-------------------------
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TCL readline support added. See README.md for build instructions.
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Release 2.3.2 2022/07/03
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-------------------------
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The liberty default_wire_load is now ignored. You must explicitly set the wire load
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model with the set_wire_load_model command to apply wire load model based parasitics.
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Release 2.3.1 2020/11/08
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-------------------------
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The read_sdf command no longer supports the -analysis_type, -type, -min_type,
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and -max_type arguments. Use the set_operating_conditions -analysis_type
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command to set the analysis type before read_sdf.
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Release 2.2.0 2020/07/18
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-------------------------
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The report_units reports the current units used by commands.
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report_units
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The report_check_types -min_fanout -max_fanout -max_capacitance -min_capacitance
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report_check_types [-min_fanout] [-max_fanout] [-max_capacitance] [-min_capacitance]
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The insert_buffer command is no longer supported.
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Release 2.0.0 2018/09/28
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-------------------------
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The command line options have changed to the following:
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-help show help and exit
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-version show version and exit
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-no_init do not read .sta init file
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-threads count|max use count threads
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-no_splash do not show the license splash at startup
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-exit exit after reading cmd_file
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cmd_file source cmd_file
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....
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Builds using Autotools/configure are no longer supported.
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Use CMake as documented in README.md.
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....
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The check_timing command -no_output_delay checks output ports for
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set_output_delay.
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....
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The report_power command reports the power consumption of the design
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or a specific instance.
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report_power [-instances inst] [-digits digits] [> filename] [>> filename]
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The internal, switching, leakage and total power are reported. Design
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power is reported separately for combinational, sequential, macro and
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pad groups.
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Use -instances to report power for a specific instance.
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Use the set_power_activity command to specify activity/duty
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globally using -global, the input port default using -input,
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or for input ports using -input_ports, or pins using -pins.
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set_power_activity [-global]
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[-input]
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[-input_ports ports]
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[-pins pins]
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[-activiity activity]
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[-duty duty]
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....
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The write_path_spice command writes a spice netlist for a timing path.
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write_path_spice -path_args path_args
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-spice_directory spice_directory
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-subckt_file subckt_file
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-lib_subckt_file lib_subckts_file\
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-model_file model_file
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-power power
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-ground ground
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Use path_args to specify -from/-through/-to as arguments to the
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find_timing_paths command. For each path, a spice netlist and the
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subckts referenced by the path are written in spice_directory. The
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spice netlist is written in path_<id>.sp and subckt file is
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path_<id>.subckt.
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Spice netlists for liberty library cells are read from
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lib_subckts_file. The spice netlists used by the path are written to
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subckt_file, which spice_file .includes. The device models used by the
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spice subckt netlists in model_file are .included in spice_file. Power
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and ground names are specified with the -power and -ground arguments.
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The spice netlist includes a piecewise linear voltage source at the
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input and .measure statement for each gate delay and pin slew.
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....
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The report_checks and report_check_types commands now support an
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-unconstrained flag.
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report_checks -unconstrained
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report_check_types -unconstrained
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The sta_report_unconstrained_paths variable will be supported for
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for compatibility in the current release.
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....
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The transition_time path reporting field has been renamed to slew.
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report_checks -fields {slew}
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report_check_types -fields {slew}
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...
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The read_parasitics command has been renamed read_spef and no longer
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supports the SPF format.
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....
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The make_instance command now takes a single instance name argument
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and returns the instance.
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make_instance instance_name
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The make_net command now takes a single net name argument and returns
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the net.
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make_net net_name
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The delete_instance command deletes a single instance instead of a list
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of instances.
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delete_instance instance
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The delete_net command deletes a single net instead of a list
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of nets.
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delete_net net
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The disconnect_pins command is renamed disconnect_pin and disconnects a
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single pin.
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disconnect_pin net pin
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The report_tns and report_wns commands print the value returned by
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total_negative_slack and worst_negative_slack respectively.
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report_tns
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report_wns
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report_worst_slack
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The set_clock_sense command was deprecated by SDC 2.1.
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Use set_sense -type clock instead.
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# Local Variables:
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# mode:text
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# End:
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