readback_hw_device - 2023.1 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

Document ID

UG835

Release Date

2023-05-16

Version

2023.1 English

Readback hardware devices

Syntax

readback_hw_device [‑force] [‑capture] [‑readback_file <arg>]
    [‑bin_file <arg>] [‑readback_pdi <arg>] [‑quiet] [‑verbose]
    [<hw_device>...]

Returns

Hardware devices

Usage

Name	Description
`[-force]`	force write of file
`[-capture]`	capture configuration readback data (ultrascale only)
`[-readback_file]`	readback file for rbd file output
`[-bin_file]`	bin file for bin file output
`[-readback_pdi]`	readback PDI
`[-quiet]`	Ignore command errors
`[-verbose]`	Suspend message limits during command execution
`[<hw_device>]`	list of hardware devices Default: current hardware device

Description

Read bitstream data from the current hardware device and write it to the specified readback or binary file.

The Vivado® device programmer will readback bitstream data from the Xilinx® device through the open target.

Important: If the bitstream on the hw_device is encrypted, readback is not permitted.

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

Arguments

-force - (Optional) Force the overwriting of the specified file if one of the same name already exists.

-capture - (Optional) Enable readback capture of configuration data on UltraScale™ devices only. Readback capture can be used to determine the content of user state elements, such as CLB registers, block RAM, distributed RAM, and SRL contents.

-readback_file <arg> - (Optional) Write a readback file (RDB) which is an ASCII output of the bitstream read from the specified hw_device. This file is similar to the ASCII file that is produced by the write_bitstream -raw_bitfile command, except that it has no header.

Important: Although both -readback_file and -bin_file are optional, one or both of these options must be specified or the command has no output file to write the results to.

-bin_file <arg> - (Optional) Write a binary file (BIN) containing the programming data read back from the specified hw_device. This file is similar to the binary file that is produced by the write_bitstream -bin_file command.

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.

-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.

<hw_device> - (Optional) The hw_device object to read the programming data from. The hw_device must be specified as an object as returned by the get_hw_devices or current_hw_device commands. If the hardware device is not specified, the current_hw_device will be used.

Example

The following example writes an ASCII file of the bitstream data read back from the current hardware device:

readback_hw_device -readback_file C:/Data/readback_1.rbd [current_hw_device]