Disable the extended FIFO FPGA target during execution

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  You are
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  It looks like
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• Rinse the target DMA to host FIFO FPGA

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  No matter which deals with this problem before, and how to solve?

  Hello

  I think that your first method is the best option. When you save a timeout, have triggered a case on your side of RT first making a FIFO reading which returns the number of items in the FIFO (but reads the items suck) and then immediately do a read FIFO that reads the number of items remaining. This will clear your FIFO and it should run quickly.

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• Error: Execution of registry is supported only on the FPGA target

  I am trying to write a debugging tool to test the communication between objects FP on my host VI to a RT system and then to a FPGA system.  I thought I would "simulate" the three layers with queues between them in order to ensure that the parameters are received correctly - a comprehensive test of Communications virtually.  I want to be able to run this VI on the host.  There are a lot of bits being shifted and twisted and be able to define probes and braekpoints within a single host VI is an advantage.

  Initially, it worked fine after copying my FPGA code (with object instantiation of the registers and then reading and writing for them), but now then LabVIEW did another thing that disappears (with no goodbye or anything like that).  When I say that it worked, the values read from the FPGA objects that instantiate their own records showed the correct values when sending data.  This means that LV really instantiate records and has been able to address them individually.

  Since then, I get the error appearing in the title, whenever I try to run the VI.

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  Shane

  False alarm, I had no wired all my objects instantiated (and thus a communication VI received default objects with no valid registry.

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• FPGA target host DMA FIFO multi-channel

  Hi people,

  I have a little trouble to collect my FPGA application data. The control of my FPGA application loop is running and read data from set point between a host and target FIFO to a period of 50 uSec. I run a separate loop to write data collected form two channels in a target of FIFO host over a period of 1000 uSec. I'm taking the data from both channels and its reading on the host in bundles of 500 data samples. The first problem I have is that my method of reading times unless I put my data acquisition loop to run at a much slower pace. My FIFO depth host side is 60000, almost as large as the total number of data samples that I expect to collect in total.

  I have another problem when trying to write the data to a table. Even if my method of reading does not expire, I don't think that will record the first beam of data that are read. I've initialized an empty table outside my acquistion of the side loop host and used the table VI build to take the current data set and add it at the end of this table. I then store in a shift register and pass it in the next iteration where I try to join the new data set to the old and so on. I expected to get a table with all the data, but as I said I'm only collecting the first set of 500. I wonder if my program structure is correct. Any help anyone could offer would be greatly appreciated. I have attached a few pictures of my reference request. Thank you.

  Hi Daniel,.

  Thank you for your response. I think I found a solution to the problems that I had. Looks like it was a combination of a couple things. First, the data acquisition loop was running not until the movement was already over since I plugged the condition to stop the loop of writing deposit directly on the data read loop. This problem has been fixed by creating a shared variable for the stop condition and it wiring to two loops independently. This explains why I got only the first set of data, as it was stored in the FIFO until the end of the movement. However, the FIFO of feedback was still time. Before attaching the stop condition error, I placed a probe on the "items remaining" wire of the read method and concluded that there was only 1023 elements (the depth of the FIFO on the side FPGA) even if I set the FIFO depth host side to 60000. "» I realized it was originally due to the Read method not called for the first time until the end of the movement. Although the problem of break for most fixed condition this problem given that the Read method was now called during the movement, I decided to take a preventive measure and calling the 'Start' before the movement FIFO method is started just to make sure that the memory of PEP on the side host is available immediately.

  So yes, it turns badly I put sync settings have been well after all. Good call on the reversal of the order on the Array function to build. Oh, and I also had to move the waveform diagram to until the table is built so that it is not Replot the old data on top of all the new data it receives. On the same note, I moved to the indicator in table at the end outside of the loop of reading. Thanks again for your help.

  Kind regards

  John has

• How to choose the maximum number of items for DMA FIFO to the R series FPGA

  Greetings!

  I'm working on a project with card PCIe-7842R-R series FPGA of NOR. I use to achieve the fast data transfer target-to-host DMA FIFO. And to minimize overhead costs, I would make the size of the FIFO as large as possible. According to the manual, 7842R a 1728 KB (216KO) integrated block of RAM, 108 000 I16 FIFOs items available in theory (1 728 000 / 16). However the FPGA had compilation error when I asked this amount of items. I checked the manual and searched online but could not find the reason. Can someone please explain? And in general, what is the maximum size of the FIFO given the size of the block of RAM?

  Thank you!

  Hey iron_curtain,

  You are right that the movement of large blocks of data can lead to a more efficient use of the bus, but it certainly isn't the most important factor here. Assuming of course that the FIFO on the FPGA is large enough to avoid overflowing, I expect the dominant factor to the size of reading on the host. In general, larger and reads as follows on the host drive to improve throughput, up to the speed of the bus. This is because as FIFO. Read is a relatively expensive operation software, so it is advantageous to fewer calls for the same amount of data.

  Note that your call to the FIFO. Read the largest host buffer should be. Depending on your application, you may be several times larger than the size of reading. You can set the size of the buffer with the FIFO. Configure the node.

  http://zone.NI.com/reference/en-XX/help/371599H-01/lvfpgaconcepts/fpga_dma_how_it_works/ explains the different buffers involved. It is important to note that the DMA engine moves data asynchronously read/write on the host nodes and FPGAs.

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  Sebastian