Create histogram
Syntax
create_slack_histogram [‑to <args>] [‑delay_type <arg>] [‑num_bins <arg>]
[‑slack_less_than <arg>] [‑slack_greater_than <arg>] [‑group <args>]
[‑report_unconstrained] [‑significant_digits <arg>] [‑scale <arg>]
[‑name <arg>] [‑cells <args>] [‑quiet] [‑verbose]Usage
| Name | Description |
|---|---|
[-to]
|
To clock |
[-delay_type]
|
Type of path delay: Values: max, min, min_max Default: max |
[-num_bins]
|
Maximum number of bins: Valid Range (1-100) Default: 10 |
[-slack_less_than]
|
Display paths with slack less than this Default: 1e+30 |
[-slack_greater_than]
|
Display paths with slack greater than this Default: -1e+30 |
[-group]
|
Limit report to paths in this group(s) |
[-report_unconstrained]
|
Report unconstrained end points |
[-significant_digits]
|
Number of digits to display: Range: 0 to 3 Default: 3 |
[-scale]
|
Type of scale on which to draw the histogram; Values: linear, logarithmic Default: linear |
[-name]
|
Output the results to GUI panel with this name |
[-cells]
|
run create_slack_histogram on the specified cell(s) |
[-quiet]
|
Ignore command errors |
[-verbose]
|
Suspend message limits during command execution |
Description
Create a slack histogram grouping paths into slack ranges, and displaying the results graphically.
Arguments
-to <args> - (Optional) Specify a clock name, to analyze paths that end in the specified clock domain.
-delay_type <arg> - (Optional) Specifies the type of path delay to analyze when creating the slack report. The valid values are min, max, and min_max. The default setting for -delay_type is max.
-num_bins <args> - (Optional) Specify the number of slack bins to divide the results into. The number of bins determines the granularity of the histogram returned. The range of slack values calculated is divided evenly into the specified number of bins, and the paths are grouped into the bins according to their slack values. The value can be specified as a number between 1 and 100, with a default value of 10.
-slack_less_than <arg> - (Optional) Report slack on paths with a calculated slack value less than the specified value. Can be used with -slack_greater_than to provide a range of slack values of specific interest.
-slack_greater_than <arg> - (Optional) Report slack on paths with a calculated slack value greater than the specified value. Can be used with -slack_less_than to provide a range of slack values of specific interest.
-group <args> - (Optional) Report slack for paths in the specified path groups. Currently defined path groups can be determined with the get_path_groups command.
-report_unconstrained - (Optional) Report delay slack on unconstrained paths. By default, unconstrained paths are not analyzed.
-significant_digits <arg> - (Optional) The number of significant digits in the output results. The valid range is 0 to 3. The default setting is 3 significant digits.
-scale [ linear | logarithmic ] - (Optional) Specify the Y-axis scale to use when presenting the slack histogram. Logarithmic allows for a smoother presentation of greatly different values, but linear is the default.
-name <arg> - (Optional) Specifies the name of the results set for the GUI. If the name specified is currently opened, the create_slack_histogram will overwrite the current results.
-cells <arg> - (Option) Generate the report for the specified hierarchical cells. The details of the report will be based on the specified cells rather than the whole design, or current_instance.
-quiet - (Optional) Execute the command quietly, returning no messages from the command. The command also returns TCL_OK regardless of any errors encountered during execution.
-verbose - (Optional) Temporarily override any message limits and return all messages from this command.
set_msg_config command.Examples
create_slack_histogram -name slack1