High Speed Digital I/O using 6533

I would like to have a application sending out bit sequence through port0 of PCI 6533 card, and using port2 recieve those bits, then do a pattern matching.
I set the output bit pattern changes at the 10th iteration of my control loop, however, I got the changed bit pattern at lots of iteration later. I cannot figure out what happened.
I want to achieve the pattern matching in the oder of milliseconds(immediately knows the bit pattern has changed). But it seems my programs structure cannot do that. Please take a look at my program and give me some advice, thank a lot.
Best Regrads,
Stee
Attachments:
Testing_6533_buffer.vi ‏143 KB

Hi Stee,
I might have a couple ideas why your data might be delayed. But help me understand what you are trying to accomplish. Are you trying to acquire continuous data from port 2? Are you acquiring it using change detection (you want to acquire everytime there is a difference in the data)? Do you want to acquire it with a pattern match trigger?
What I imagine is happening is that you are only acquiring data every so often and the PCI-6533 card by default is transferring this data via DMA. The interesting thing about this is that if you need each sample right away transferred to the PC Memory so you can read it, it might not happen with DMA. This is because in DMA mode on the PCI-6533 the "MITE" chip that packs data for transport waits until it h
as enough samples to send. Therefore, if you are only acquiring so often, you might be trying to read the present data (which is on the board) but the MITE is waiting to pack the data and send it to the PC Memory so you can read it.
What you need to do in this case is use the Set DAQ Device Info.vi to change the transfer mode from DMA to interrupts for the second group (your digital input). In interrupt mode, as soon as you input data, it is sent via interrupts to PC Memory. This means it won't wait for a "packet" to be filled before it sends the data. This means if you are acquiring digital input at rates up to 500kHz, interrupts will allow you to get the data right away.
Anyway, let me know if I wasn't clear in my explanation. Hope that helps.
Ron
Applications Engineer
National Instruments

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I'm not certain but maybe some of the delay is happening because you are changing the mode of the pin. According to the specs on the card it is capable of having a Maximum Clock Rate of 40MHz under the DIO section. So if you are purely doing digital reads, or digital writes you should be able to update/read 40,000,000 times a second. If you perform a read, which can take up to 1/40M of a second, then invert which takes some time but practically none, then another write which can take up to 1/40M of a second, your loop rate should still be faster than the 10MHz you showed. That's why I suspect there is time involved in changing over the pin from a read mode to a write.
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