get_ports - 2021.2 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

Document ID

UG835

Release Date

2021-10-22

Version

2021.2 English

Get a list of ports in the current design

Syntax

get_ports [‑regexp] [‑nocase] [‑filter <arg>] [‑of_objects <args>]
    [‑match_style <arg>] [‑scoped_to_current_instance] [‑no_traverse]
    [‑prop_thru_buffers] [‑quiet] [‑verbose] [<patterns>]

Returns

List of port objects.

Usage

Name	Description
`[-regexp]`	Patterns are full regular expressions
`[-nocase]`	Perform case-insensitive matching (valid only when -regexp specified)
`[-filter]`	Filter list with expression
`[-of_objects]`	Get ports of these nets, instances, sites, clocks, timing paths, io standards, io banks, package pins, drc violations
`[-match_style]`	Style of pattern matching, valid values are ucf, sdc Default: sdc
`[-scoped_to_current_instance]`	Match patterns on instance pins specified using current instance, and then find top level connected ports.
`[-no_traverse]`	Do not traverse to find top level terminals.
`[-prop_thru_buffers]`	Allow propagate through buffers when traversing to find top level terminals connected to pins of scoped instance.
`[-quiet]`	Ignore command errors
`[-verbose]`	Suspend message limits during command execution
`[<patterns>]`	Match port names against patterns Default: *

Description

Gets a list of port objects in the current design that match a specified search pattern. The default command gets a list of all ports in the design.

Note: To improve memory and performance, the 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.

Arguments

-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.

Note: The Tcl built-in command 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.

-filter <args> - (Optional) Filter the results list with the specified expression. The -filter argument filters the list of objects returned by get_ports based on property values on the ports. You can find the properties on an object with the report_property or list_property commands. In the case of the "ports" object, "PARENT" and "TYPE" are some of the properties that can be used to filter results.

The filter search pattern should be quoted to avoid having to escape special characters. String matching is case-sensitive and is always anchored to the start and to the end of the search string. The wildcard “*” character can be used at the beginning or at the end of a search string to widen the search to include a substring of the property value.

Note: The filter returns an object if a specified property exists on the object, and the specified pattern matches the property value on the object. In the case of the "*" wildcard character, this will match a property with a defined value of "".

For string comparison, the specific operators that can be used in filter expressions are "equal" (==), "not-equal" (!=), "match" (=~), and "not-match" (!~). Numeric comparison operators <, >, <=, and >= can also be used. Multiple filter expressions can be joined by AND and OR (&& and ||). The following gets input pins that do NOT contain the “RESET” substring within their name:

get_pins * -filter {DIRECTION == IN && NAME !~ "*RESET*"}

Boolean (bool) type properties can be directly evaluated in filter expressions as true or not true:

-filter {IS_PRIMITIVE && !IS_LOC_FIXED}

-of_objects <arg> - (Optional) Get the ports connected to the specified nets, bels, sites, clocks, timing paths, io_standards, iobanks, or package_pins; or ports associated with specified DRC violation objects.

Note: The -of_objects option requires objects to be specified using the get_* commands, such as get_cells or get_pins, rather than specifying objects by name. In addition, -of_objects cannot be used with a search <pattern>.

-match_style [sdc | ucf] - (Optional) Indicates that the search pattern matches UCF constraints or SDC constraints. The default is SDC.

-scoped_to_current_instance - (Optional) This returns the top-level pins of the current instance. Applies the specified search <patterns> to find the instance pins on the current instance.

-prop_thru_buffers - (Optional) This option returns the top-level ports connected to pins on the current instance. This option can be used with the -scoped_to_current_instance option to propagate the search from the pins of the current instance, through buffers, to the top-level ports of the design.

-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.

Note: Any errors encountered on the command-line, while launching the command, will be returned. Only errors occurring inside the command will be trapped.

-verbose - (Optional) Temporarily override any message limits and return all messages from this command.

Note: Message limits can be defined with the set_msg_config command.

<patterns> - (Optional) Match ports against the specified patterns. The default pattern is the wildcard '*' which gets a list of all ports in the project. More than one pattern can be specified to find multiple ports based on different search criteria.

Note: You must enclose multiple search patterns in braces, {}, or quotes, "", to present the list as a single element.

Examples

The following example gets a list of pins attached to the specified cell:

get_ports -of_objects [lindex [get_cells] 1]

Note: If there are no ports matching the pattern, the tool will return a warning.

The following example runs the report_drc command on the current design, returns the list of violations in the specified DRC report, and then returns the ports associated with any violations of the unspecified I/O Standard rule (NSTD):

report_drc -name drc_1
get_drc_violations -name drc_1
get_ports -of_objects [get_drc_violations -name drc_1 NSTD*]

This example specifies a cell for the current instance, returns the pins scoped to the current instance, and returns the top-level ports connected to those pins:

current_instance [get_cells dac_spi*]
get_ports -scoped_to_current_instance
get_ports -scoped_to_current_instance -prop_thru_buffers