Requests a region to read from the Target to Host FIFO and returns an external data value reference to this region.
Use this node to automatically begin DMA data transfer between the FPGA target and the host computer without using
Start DMA FIFO.
Select the FIFO you want to use from the
FIFO
menu on the
Item
tab.
reference in
Reference to an FPGA VI.
Obtain a reference using the
Open FPGA Reference
node.
number of elements
Size of the buffer region this node acquires.
timeout (ms)
Time, in milliseconds, that the node waits to complete before reporting a timeout error.
Wire a value of –1 to this input to wait indefinitely.
Default:
5000
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
elements remaining
Number of elements remaining in the host buffer part of the Target to Host FIFO that are available to read.
read region reference
Reference to the array of elements the device driver allocates.
You must delete this reference using the
Delete Data Value Reference
node before the driver can write new data to the specified portion of the buffer.
elements in region
Total number of elements in the memory region this node acquires.
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.
|
Where This Node Can Run:
Desktop OS: Windows
FPGA:
Not supported
Web Server: Not supported in VIs that run in a web application