get_sites - 2024.1 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

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2024.1 English

Get a list of Sites


get_sites [‑regexp] [‑filter <arg>] [‑nocase] [‑range <args>]
    [‑of_objects <args>] [‑quiet] [‑verbose] [<patterns>]


List of site objects.


Name Description
[-regexp] Patterns are full regular expressions
[-filter] Filter list with expression
[-nocase] Perform case-insensitive matching. (valid only when -regexp specified)
[-range] Match site names which fall into the range. Range is defined by exactly two site names.
[-of_objects] Get the sites of slrs, tiles, bels, site_pins, package_pins, ports, pblocks, nets, site_types, io_banks, cells, clock_regions or drc_violation
[-quiet] Ignore command errors
[-verbose] Suspend message limits during command execution
[<patterns>] Match site names against patterns. Bonded sites will also match on package pin names. Default: *


Device, XDC, Object


Gets a list of sites on the target device that match a specified search pattern. The default command gets a list of all sites on the target device.

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.


-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 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

-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_sites based on property values on the sites. You can find the properties on an object with the report_property or list_property commands. In the case of the site object, "SITE_TYPE", "IS_USED", "NUM_INPUTS", and "NUM_OUTPUTS" 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:

-range <arg> - (Optional) Get all the sites that fall into a specified range. The range of sites must be specified with two site values, of the same SITE_TYPE, such as {SLICE_X2Y12 SLICE_X3Y15}. The SITE_TYPE of a site can be determined by the report_property command.

Note: Specifying a range with two different types will result in an error.
-of_objects <arg> - (Optional) Get sites from the specified object or objects. Valid objects include: tiles, BELs, pins, package pins, ports, Pblocks, I/O Banks, cells, and clock_regions; or sites 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>.
-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 sites against the specified patterns. The default pattern is the wildcard '*' which gets a list of all sites on the target device.


The following example gets a list of all sites available on the target device:


The following example returns the number of sites that are not currently used on the device. Both command forms in the example return the same results. The second command directly evaluates the IS_USED boolean property:

llength [get_sites -filter {IS_USED==0}]
llength [get_sites -filter !IS_USED]
Note: If no sites match the pattern you will get a warning.

The following example gets all of the sites on the device, and returns the unique SITE_TYPEs:

set sites [get_sites]
set type {}
foreach x $sites {
   set prop [get_property SITE_TYPE $x]
   if { [lsearch -exact $type $prop] == -1 } {
      lappend type $prop
foreach y $type {
   puts "SITE_TYPE: $y"

The following example shows three different forms for specifying the range of sites to return:

get_sites -range {SLICE_X0Y0 SLICE_X1Y1}
get_sites -range SLICE_X0Y0 -range SLICE_X1Y1
get_sites -range {SLICE_X0Y0:SLICE_X1Y1}