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-true_threshold path_delay Specifies a threshold path delay value, in library time units, to be used by the -true option to speed up the searching. This option is only used the true option. If you specify this option, report_timing -true returns the first path it finds that is greater than or equal to path_delay, rather than continuing to search for a longer one. This option requires a DC Ultra license. -justify Finds an input vector that sensitizes the reported paths, or reports that the path is false if no input vector is found. Use the set_true_delay_case_analysis command to specify a partial input vector to be considered for -justify analysis. You cannot use this option with the -loops option. This option requires a DC Ultra license.2-6 Synopsys Inc. 1988-2005. All rights reserved. x2005.09Command Reference 2. Synopsys Commands report_timing -enable_preset_clear_arcs Enables asynchronous timing arcs for this report. By default, asynchronous timing arcs are disabled during all timing verification. This option allows you to see the timing with these arcs enabled. Only the current report is affected. -significant_digits digits Specifies the number of digits to the right of the decimal point to report. Allowed values are from 0 through 13. The default is 2. Using this option overrides the value set by the report_default_significant_digits variable. -nosplit Prevents prevents line-splitting and facilitates writing software to extract information from the report output. Most of the design information is listed in fixed-width columns. If the information in a given field exceeds the column width, the next field begins on a new line, starting in the correct column. -sort_by group | slack Specifies the order in which the paths are reported. The default -sort_by key is group. By default, paths are sorted by costing groups. Within each group, the paths are ordered by slack. With slack, the paths are ordered by slack only. -group group_name Specifies the path group from which timing paths are selected for reporting, based on other specified options for reports. If -group is not specified, the reported paths are a subset of paths from all path groups. This option cannot be used with -loops. -trace_latch_borrowx2005.09 Synopsys Inc. 1988-2005. All rights reserved. 2-7report_timing 2. Synopsys Commands Command Reference This option controls the type of report generated for a path that starts at a transparent latch. If the path startpoint borrows from the previous stage, using this option causes the report to show the entire set of borrowing paths that lead up to the borrowing latch, starting with a nonborrowing path or a noninverting sequential loop. By default, the report shows only the last path in the sequence of borrowing stages. Each stage is reported separately, showing the time borrowed and lent and the endpoints of the stage. The cumulative amount of borrowed time along a sequence of stages is not included in the report. The options -input_pins, -nets, -transition_time, -capacitance, and -significant_digits apply to every stage in the sequence of borrowing paths, but the remaining options (for example, -from and -true) apply only to the last stage reported. -derate Prints timing derate values for each path element. By default, no derate value is printed. When this option is specified, the -input_pins and -nets options are automatically turned on. Input delay and ideal clock network latency is not derated.DESCRIPTION The report_timing command provides a report of timing information for the current design.EXAMPLES The following example shows a timing report using only the default values: prompt> report_timing **************************************** Report : timing -path full -delay max -max_paths 1 Design : led2-8 Synopsys Inc. 1988-2005. All rights reserved. x2005.09Command Reference 2. Synopsys Commands report_timing Version: v3.1a Date : Tue Apr 7 16:23:02 1992 **************************************** Operating Conditions: Wire Loading Model Mode: top Startpoint: c (input port) Endpoint: z2 (output port) Path Group: default Path Type: max Point Incr Path ----------------------------------------------------------- input external delay 0.00 0.00 r c (in) 0.00 0.00 r u1/Z (IVA) 0.54 0.54 f u0/Z (NR2) 1.20 1.74 r u8/Z (IVA) 0.43 2.17 f u7/Z (OR3) 1.24 3.41 f z2 (out) 0.00 3.41 f data arrival time 3.41 max_delay 0.00 0.00 output external delay 0.00 0.00 data required time 0.00 ----------------------------------------------------------- data required time 0.00 data arrival time -3.41 ----------------------------------------------------------- slack (VIOLATED) -3.41 The following example reports the longest path to Z1, without required-time and slack calculation: prompt> report_timing -to z1 -nworst 2 -path only **************************************** Report : timing -path only -delay max -nworst 2 -max_paths 2 Design : led Version: v3.1a Date : Tue Apr 7 16:52:43 1992 **************************************** Operating Conditions: Wire Loading Model Mode: topx2005.09 Synopsys Inc. 1988-2005. All rights reserved. 2-9report_timing 2. Synopsys Commands Command Reference Startpoint: c (input port) Endpoint: z1 (output port) Path Group: default Path Type: max Point Incr Path ----------------------------------------------------------- input external delay 0.00 0.00 f c (in) 0.00 0.00 f u1/Z (IVA) 0.60 0.60 r u17/Z (AO7) 0.53 1.13 f u18/Z (OR3) 1.24 2.37 f z1 (out) 0.00 2.37 f data arrival time 2.37 ----------------------------------------------------------- Startpoint: d (input port) Endpoint: z1 (output port) Path Group: default Path Type: max Point Incr Path ----------------------------------------------------------- input external delay 0.00 0.00 f d (in) 0.00 0.00 f u20/Z (IVA) 0.53 0.53 r u17/Z (AO7) 0.53 1.06 f u18/Z (OR3) 1.24 2.30 f z1 (out) 0.00 2.30 f data arrival time 2.30 ----------------------------------------------------------- The following example reports the endpoint path delay, required time, and slack for each path: prompt> report_timing -path end **************************************** Report : timing -path end -delay max Design : led Version: v3.1a Date : Tue Apr 7 16:28:07 1992 **************************************** Operating Conditions: Wire Loading Model Mode: top Endpoint Path Delay Path Required Slack⌨️ 快捷键说明
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