write_hw_ila_data - 2023.2 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

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2023.2 English

Write hardware ILA data to a file


write_hw_ila_data [‑force] [‑csv_file] [‑vcd_file] [‑legacy_csv_file]
    [‑quiet] [‑verbose] <file> [<hw_ila_data>] [<hw_ila_data>]


Name of the output file.


Name Description
[-force] Overwrite existing file
[-csv_file] Export CSV format file only
[-vcd_file] Export VCD format file only
[-legacy_csv_file] Export csv file without radix information.
[-quiet] Ignore command errors
[-verbose] Suspend message limits during command execution
<file> hardware ILA data file name
[<hw_ila_data>] hardware ILA data object Default: Current hardware ILA data




Write the ILA debug core sample data, stored in the specified hw_ila_data object, to a binary file on the disk.

A hw_ila_data object is created when the hw_ila is triggered on the hw_device, or by the upload_hw_ila_data command when moving the captured data from the physical FPGA device, hw_device.

The write_hw_ila_data lets you write the data of the hw_ila_data object to a binary file on the disk for later review. You can read the ILA debug core data back into the Vivado™ logic analyzer using the read_hw_ila_data command, which creates a new hw_ila_data object.

This command returns the name of the file written, or returns an error if it fails.


-force - (Optional) Overwrite an existing file of the same name if one exists.

-csv_file - (Optional) Export a comma-separated values (CSV) file only. This configures the write_hw_ila_data command to export the ILA data in the form of a CSV file that can be used to import into a spreadsheet or third-party application, rather than the default binary ILA file format.

-vcd_file - (Optional) Export a value change dump (VCD) file only. This configures the write_hw_ila_data command to export the ILA data in the form of a VCD file that can be used to import into a third-party application or viewer, rather than the default binary ILA file format.

-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.

<file> - (Required) The filename of the ILA data file to write. The default file extension for an ILA data file is .ila. The default file extension for -csv_file is .csv, and for -vcd_file is .vcd.

Note: If the path is not specified as part of the file name, the file will be written into the current working directory, or the directory from which the tool was launched.

<hw_ila_data> - (Optional) The hardware ILA data to write to the specified file. The hw_ila_data must be specified as an object, as returned by the get_hw_ila_datas or the current_hw_ila_data commands. If no hw_ila_data object is specified, the current hw_ila_data is written to the specified file.


The following example uploads the data from the hw_ila debug core into a hw_ila_data object, and then writes that data object to the specified ILA data file, overwriting an existing file if one exists:

write_hw_ila_data -force design1_ila_data [upload_hw_ila_data hw_ila_1]

This example triggers the hw_ila, then writes the captured hw_ila_data to a CSV file:

run_hw_ila hw_ila_1
write_hw_ila_data -csv_file C:/Data/design1_ila_data [current_hw_ila_data]