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32 and 64 bit wide DMA channels

Operating Systems


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  #1  
Old 14-11-2008
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32 and 64 bit wide DMA channels
  

According to Wikipedia, the DMA channels 0, 1, 2 and 3 with 8-bit and DMA channels 4, 5, 6 and 7 with only 16 bits.

But why so little?
What's with 32 and 64 bit wide channels?

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  #2  
Old 14-11-2008
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Re: 32 and 64 bit wide DMA channels

With a 64-bit wide DMA channel, there can be much more data in the same period in the memory slide.
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  #3  
Old 14-11-2008
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Re: 32 and 64 bit wide DMA channels

But where is DMA still used today?
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  #4  
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Re: 32 and 64 bit wide DMA channels

It is used for example when hard drives, even the video card uses it.
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  #5  
Old 14-11-2008
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Re: 32 and 64 bit wide DMA channels

Quote:
Originally Posted by Devasis View Post
With a 64-bit wide DMA channel, there can be much more data in the same period in the memory slide.
The memory is certainly as fast, but it remains to ask whether the secondary memory is so fast that it is observed

So far nothing would broaden to 64-bit, since the source of the data is not as fast that can deliver.
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  #6  
Old 14-11-2008
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Re: 32 and 64 bit wide DMA channels

The classic DMA channels with external DMA controller, but is no longer used.

Aufm PCI bus for example, calls itself the whole bus mastering and works differently.
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  #7  
Old 14-11-2008
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Re: 32 and 64 bit wide DMA channels

So as I understand it, is the DMA, with these DMA channels has a completely different technology than the DMA when Ultra DMA. I remember how I felt UDMA hard drive and I had wondered then that nothing in the occupancy of DMA channels appeared. A buddy gave me an explanation that both are nothing to do.
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  #8  
Old 14-11-2008
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Re: 32 and 64 bit wide DMA channels

DMA is direct memory access. Depending on the context, but the memory of a completely different type, generally thought as the memory. UDMA one may think same as DMA but it provides direct access to the disk, which are 2 totally different things.
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