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Discussion Groups | Comp.Arch.Embedded | ATAPI-4 mode for CompactFlash

There are 3 messages in this thread.

You are currently looking at messages 0 to 3.

ATAPI-4 mode for CompactFlash - Martin - 04:15 30-03-04

I want ask which mode is using CompactFlash device. It's not clear
from ATAPI-4 spec. Is it always PIO in/out protocol or can I even run
write/read in any of DMA modes?



Re: ATAPI-4 mode for CompactFlash - =?ISO-8859-1?Q?Tankred_M=FCller?= - 05:56 30-03-04

Martin wrote:

> I want ask which mode is using CompactFlash device. It's not clear
> from ATAPI-4 spec. Is it always PIO in/out protocol or can I even run
> write/read in any of DMA modes?

Have a look at
http://www.sandisk.com/pdf/industrial/ProdManualIndustrialGradeATAv2.6.pdf
http://www.sandisk.com/pdf/industrial/ProductManualStdGradev1.5.pdf

They support PIO0..4 and DMA0..2.

Tankred.

Re: ATAPI-4 mode for CompactFlash - Tim Clacy - 05:55 31-03-04

Martin wrote:
> I want ask which mode is using CompactFlash device. It's not clear
> from ATAPI-4 spec. Is it always PIO in/out protocol or can I even run
> write/read in any of DMA modes?

1) DMA
DMA is only supported in true IDE mode; not removable CompactFlash/PCMCIA
mode. Of course, you can power-up a CompactFlash device in true IDE mode...
if you want.

2) PIO
Someone please correct me if I'm wrong, but there seems to be a bit of a
problem with CompactFlash and PIO; firstly, PIO is really only appropriate
for x86/PC-AT (or architecures where IO and memory are in different address
spaces). If you want to use CompactFlash in memory-mapped mode (as most
embedded products do), then PIO timings are not much help; there don't seem
to be any equivalent 'Memory Cycle' timings in the device identity or CIS.

Regards


Tim