Empties data from the FIFO and sends the data to the recipient.
For DMA target-to-host FIFOs, the recipient is the host. For peer-to-peer writer FIFOs, the
recipient is the peer-to-peer reader FIFO. You must enable the peer-to-peer stream when
flushing a peer-to-peer writer FIFO. Otherwise, this node executes but does not flush the
FIFO.

Note
Flush FIFO must be in
the same clock domain as the Write FIFO node. Otherwise, the program
returns a code generation error when you try to compile the FPGA VI.

error in
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
error in does not contain an error
|
error in contains an error
|
 |
 |
If no error occurred before the node runs, the node begins execution normally.
If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that
error information as error out.
|
If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.
|
Default: No error
error out
Error information.
The node produces this output according to standard error behavior.
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
error in does not contain an error
|
error in contains an error
|
 |
 |
If no error occurred before the node runs, the node begins execution normally.
If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that
error information as error out.
|
If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.
|
When
to Use the Flush FIFO Node
- Use the Flush FIFO node when the need for lower latency outweighs
the need for higher data transfer rates. If you overuse the Flush
FIFO node, you may reduce data transfer rates.
- You can use the Flush FIFO node to flush FIFOs regardless of
whether the Write FIFO node uses a handshaking interface or a
timeout interface. For example, the flush still works in the following situations:
-
The Timed Out?
output of the Write FIFO node returns True when you use the
Flush FIFO node.
-
The Ready for
Input output of the Write FIFO node returns
False when you use the Flush FIFO node.
Simultaneous Flushes
If you use the Flush FIFO node when another FIFO flush is in
progress, the two flushes merge.
Where This Node Can Run:
Desktop OS: none
FPGA: All devices
Web Server: Not supported in VIs that run in a web application