all_ffs - 2024.1 English

Vivado Design Suite Tcl Command Reference Guide (UG835)

Document ID
UG835
Release Date
2024-05-30
Version
2024.1 English

Get a list of flip flop cells in the current design

Syntax

all_ffs [‑quiet] [‑verbose]

Returns

List of flip flop cell objects.

Usage

Name Description
[-quiet] Ignore command errors
[-verbose] Suspend message limits during command execution

Categories

XDC

Description

Returns a list of all flip flop instances in the current design.

You can use the get_cells command, or use the filter command to limit the results from the all_ffs command to return a list of flip-flop cells matching the specified properties.

The all_ffs command is scoped to return the objects hierarchically, from the top-level of the design or from the level of the current instance. By default the current instance is defined as the top level of the design, but can be changed by using the current_instance command.

Arguments

-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.

Examples

The following example returns the count of all flops in the design, then returns the count of all flops in the fftEngine module:

current_instance
INFO: [Vivado 12-618] Current instance is the top level of design 'netlist_1'.
top
llength [all_ffs]
15741
current_instance fftEngine
fftEngine
llength [all_ffs]
1519

This example filters the results of all_ffs to return only the FDRE flops:

filter [all_ffs] {REF_NAME == FDRE}