Memory of the PXI - 6562 Max per channel

I have two questions.

I have a PXI - 6562 and a data set is 256 MB (32 MB). I want to send the data in this dataset on a single axis of I/O serial. basically, I would like to spend my little of a set of data at the same time on both edges of the clock on an axis of IO. I don't like on the other IO pins. Is this possible with the PXI-6562 or all bits in each octet in the memory of the card corresponds to a specific channel.

If I can't send my data in series then I will accept that to encode every bit in my data set in the form of byte with a bit of data and the other zeros. This means that, for a set of data from 256 MB, I would need 8 times more memory 2048b. I understand that there are a total of 2 GB of RAM on the PXI-6562. Is this all addressable RAM in series? I can write the data of all the 2 GB of RAM for say 8 i/o ports?

gtg811q

With the PXI-6562 even if you want to only output a channel you must always write in a format of U8. So, as you describe you that a single bit, worries you, and you will need to set to 0 for the rest. This means that all data that you generate will be the value of 256 MB of data, because the smallest unit you can write with the HSDIO driver is the U8.

Now in regards to moving data on the two edges of both sides of the sample clock, this is called Double flow of data and is available with our devices OR 656 X and 6547 and 6548 devices. We have a developer area which details the DDR option more.

Advanced features of NOR-HSDIO: Double data rate

http://zone.NI.com/DevZone/CDA/tut/p/ID/6718

In reference to the memory of the generation, the width of the data to the memory of the generation is not configurable by the user. This means that if you have the 128 MB / channel option your total memory available per channel is 512 Mbit/channel. Because the width of the generation of data is set to 1 byte, and you get 4 times the memory per channel mode DDR with the 6562. The KB below explains the behavior. Look under the section 'Generation '.

Width of HSDIO and allowance data memory:

http://digital.NI.com/public.nsf/allkb/E5170A54988EF81A8625725A006103BB?OpenDocument

So, in summary, the total of 2 GB memory won't be available for a single channel, but you have a total of 256 MB/channel available for each channel. Since you are really interested in only one channel you will be able to write data from 256 MB to you. As you would put all your data on the memory of the card you have to the flow of the disc on your generator HSDIO card. To do this, we have some examples:

NOR-HSDIO Stream from disk (generation) using Win32 IO file:

http://zone.NI.com/DevZone/CDA/EPD/p/ID/5270

However, there will be a bottle neck on your PXI backplane data, because the basket max transfer rate will be around 100-110 MB/s you will not be able to cope with your generation session. Since you will write in U8s each sample is 1 byte, which means that the best you can hope to stream would be around 100 MHz or more.

We have not the cards LVDS SMU (PXI Expresss) which would allow you to have a superior data through-put, but if you do not necessarily need the LVDS, we have other options. I'm guessing you need LVDS or you would not the 6562.

The other option is to write you data in parallel in the 8-bit generation DDR and then use an external serializer for an 8 to 1, then you would be able to use all of the available memory and you would probably be able to fit all your data on the memory of the card and you do not have to stream from the disc. This external serializer allows you to put your first data point on channel 0, second data point on channel 1 and one until you loop around back and have your second sample generated between the way 0 be your 8th overall your waveform data point.

I hope this helps and let me know if you have follow-up questions. Thank you!

Tags: NI Hardware

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