get_hw_migs - 2024.1 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

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2024.1 English

Get list of hardware Migs cores.


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


Hardware migs cores.


Name Description
[-of_objects] Get 'hw_mig' objects of these types: 'hw_server hw_target hw_device'.
[-regexp] Patterns are full regular expressions
[-nocase] Perform case-insensitive matching. (valid only when -regexp specified)
[-filter] Filter list with expression
[-quiet] Ignore command errors
[-verbose] Suspend message limits during command execution
[<patterns>] Match the 'hw_mig' objects against patterns. Default: *


Hardware, Object


Returns the hw_mig objects on the current hardware device.

Memory IP included in the Xilinx™ IP catalog are used to generate memory controllers and interfaces for Xilinx devices. Memory IP includes different IP cores from the Xilinx IP catalog depending on the device architecture and memory interface specified. Refer to Zynq-7000 SoC and 7 Series Devices Memory Interface Solutions (UG586), or UltraScale Architecture-Based FPGAs Memory Interface Solutions (PG150), for details of the available memory IP.

When added to a design, the memory IP needs to be implemented into the design. This occurs after the design is synthesized, during the design optimization phase of implementation, or opt_design, or can be done manually with the implement_mig_cores command.

A memory controller can be debug enabled when added into the design from the Xilinx IP catalog. In the Vivado™ logic analyzer, or the Vivado Lab Edition, memory controllers implemented into a design are associated with hw_mig objects, one hw_mig object per debug-enabled memory controller. The hw_mig object will have all the properties needed to get the calibration status and draw the per-bit eye margin views.

In the Vivado logic analyzer, or Vivado Lab Edition, the hw_mig object lets you verify the calibration and read window margins in your memory interface design. You can use the hardware manager GUI to check the calibration status, verify the read margin for both rising and falling edges of the clock or DQS. You can also use an ILA core to verify the data integrity for the read and write operations.

This command returns a list of hw_mig objects on the current hardware device, or returns an error if it fails.


-of_objects <arg> - (Optional) Return the memory IP objects of the specified hw_server, hw_target, or hw_device 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>.
-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_hw_migs based on property values on the objects. You can find the properties on an object with the report_property or list_property commands. In the case of the hw_mig object, "DISPLAY_NAME", "BYTES", and "NIBBLES" 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:
-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 hw_mig objects against the specified patterns. The default pattern is the wildcard '*' which gets a list of all hw_migs available on the current hardware device.


The following example gets the memory IP defined on the current hardware target:

get_hw_migs -of_objects [current_hw_target]