Get the routed or estimated delays in picoseconds on a net from the driver to each load pin.
Syntax
get_net_delays ‑of_objects <args> [‑regexp] [‑nocase] [‑patterns <arg>]
[‑filter <arg>] [‑to <args>] [‑interconnect_only] [‑quiet] [‑verbose]Returns
net_delays
Usage
| Name | Description |
|---|---|
-of_objects
|
Get 'net_delay' objects of these types: 'net'. |
[-regexp]
|
Patterns are full regular expressions |
[-nocase]
|
Perform case-insensitive matching. (valid only when -regexp specified) |
[-patterns]
|
Match the 'net_delay' objects against patterns. Default: * |
[-filter]
|
Filter list with expression |
[-to]
|
Get the delay of the net to the given terminal(s) or port(s). |
[-interconnect_only]
|
Include only interconnect delays. The default is to include the intra-site delay. |
[-quiet]
|
Ignore command errors |
[-verbose]
|
Suspend message limits during command execution |
Description
Get delay objects for the specified nets in the current design, from the driver to each load pin, or to specified load pins, through specific pins.
get_property command to extract the property of interest from the delay object. Delay property values on the delay object are specified in picoseconds.
The values returned are calculated or estimated depending upon whether the net is routed. Delay values can include the actual delay of routed interconnect, or estimated net delays for unrouted nets. The net delay can also include delay through logic elements or device sites, or just include the interconnect delay.
get_* commands return a container list of a single type of objects (e.g. cells, nets, pins, or ports). You can add new objects to the list (using lappend for instance), but you can only add the same type of object that is currently in the list. Adding a different type of object, or string, to the list is not permitted and will result in a Tcl error.
The get_net_delays command returns the delay objects for the specified nets, or returns an error if it fails.
Arguments
-of_objects <arg> - (Required) Get the net delays of the specified net objects. This option can be used to reduce the amount of data returned by the get_net_delays command.
-of_objects option requires objects to be specified using the get_* commands, such as get_nets in the case of the get_net_delays command.-regexp - (Optional) Specifies that the search <patterns> are written as regular expressions. Both search <patterns> and -filter expressions must be written as regular expressions when this argument is used. Xilinx regular expression Tcl commands are always anchored to the start of the search string. You can add ".*" to the beginning or end of a search string to widen the search to include a substring. See http://perldoc.perl.org/perlre.html for help with regular expression syntax.
regexp is not anchored, and works as a standard Tcl command. For more information refer to http://www.tcl.tk/man/tcl8.5/TclCmd/regexp.htm.
-nocase - (Optional) Perform case-insensitive matching when a pattern has been specified. This argument applies to the use of -regexp only.
-patterns <arg> - (Optional) Match net_delays against the specified patterns. The default pattern is the wildcard '*' which gets a list of all net_delays in the project. More than one pattern can be specified to find multiple pins based on different search criteria.
-filter <args> - (Optional) Filter the results list with the specified expression. The -filter argument filters the list of objects returned by get_net_delays based on property values on the delay objects. You can find the properties on an object with the report_property or list_property commands. In the case of the delay object, "NET", "FAST_MAX" and "FAST_MIN" are some of the properties that can be used to filter results.
get_pins * -filter {DIRECTION == IN && NAME !~ "*RESET*"}
bool) type properties can be directly evaluated in filter expressions as true or not true: -filter {IS_PRIMITIVE && !IS_LOC_FIXED}
-to <args> - (Optional) Specifies the endpoints of nets for delay calculation. Pin, port, and pip objects can be specified as endpoints.
-interconnect_only - (Optional) Include only interconnect delays to determine the delay on the net due to routing. The default is to also include the intra-site delay into the delay calculation.
get_net_delays to define delay limits for the route_design command -min_delay or -max_delay options, you should use the -interconnect_only option to ensure the specified net delay includes just the interconnect.-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
report_property -all [lindex [get_net_delays -interconnect_only \
-of_objects [get_nets control_reg[*]]] 16 ]