I have a question about data aqusition from PCI bus

Hi.
I am designing a PCI card.I wonder if I want to do some process in LabVIEW,such as power spectrum analyse, oscilloscope, do I have to transfer the data continuously from my card?
Thank you.

Simple answer - no.
More complex answer - LabVIEW is just like any other programming
language when it comes to data collection frequency. The
frequency (intermittent, continuous, timed, etc.) depends upon the
analysis you are attempting. To do power spectra or display
waveforms, all you need is one set of data at a time. The data
does not have to be continuous. There are classes of problems
which require continuous data. If you are trying to address them,
you will need to have this mode of operation available. Most NI
input boards offer both modes - continuous and intermittent, with
intermittent being the most used, by far.
Note that with proper buffering, both modes end up being about the
same. Whether your buffer resides on the card (preferred, is more
robust, data transfer timing is not so critical) or in the computer
main RAM, the LabVIEW side of things will always take a single set of
data at once. Admittedly, this data set can be one point at a
time, but you really don't want the overhead of that in LabVIEW (or any
other higher level function - should be in your driver).
This account is no longer active. Contact ShadesOfGray for current posts and information.

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Hello All.
This is a bit of a noob question I'm sure. I don't think I really understand Data Rates and how it applies to Motion... therefore I'm not even sure what kind of questions to ask. I've been reading up online and thought I would ask some questions here. Thanks to all in advance.
I've never really worried about Data Rates until now. I am creating an Apple Motion piece with about 15 different video clips in it. And 1/2 of them have alpha channels.
What exactly is Data Rate? Is it the rate in which video clip data is read (in bits/second) from the Disc and placed into my screen? In Motion- is the Data Rate for video only? What if the clip has audio? If a HDD is simply a plastic disc with a dye read by "1" laser... how come my computer can pull "2" files off the disc at the same time? Is that what data transfer is all about? Is that were RAM comes into play?
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Is data rate what is slowing my system down?
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I store all my media on a 1TB GRaid Firewire 800 drive. However for portability I'm using a USB 2 smartdisk external drive. I think the speed is 5200rpm.
I'm guessing this all plays into the speed at which motion can function.
If I total my data rate transfer I get somewhere in the vicinity of 11MBs/second. Is that what motion needs for it to play smoothly a 11MBs/second data connection? USB 2.0 is like what 480Mbs/second. So there is no way it's going to play quickly. What if I played it from my hard drive? What is the data rate of my internal HDD?
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#1. Is my thinking correct on all of these topics? Do my bits, bytes and megs make sense. Is my thought process correct?
#2. Barring getting a new machine or buying new hardware. What can I do to speed up this workflow? Working with 15 different video clips is bogging Motion down and becoming frustrating to work with. Even if only 3-4 of the clips are up at a time it bogs things down. Especially if I throw on a glow effect or something.
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Data rate DOES make a difference, but I'd say your real problem has more to do with the fact that you're working on a Powerbook. Motion's real time capabilities derive from the capability of the video card. Not the processor. Some cards do better than others, but laptops are not even recommended for running Motion.
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Lower the display resolution to half, or quarter.
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The data rate comes into play with your setup trying to play through your USB drive. USB drives are never recommended for editing or Motion work. Their throughput is not consistent enough for video work. a small FW drive would be better, though your real problem as I said is the Powerbook.
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I hope this helps.
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