Re: What is the catch with IDMA on MPC860?

Would you mind telling me briefly what CPM, UART, DMA/IDMA, UPM, and SCC
are, or pointing me to a document that explains them?  I see these terms
used a lot, but I don't know what they stand for and have only a general
idea of what they are.  I apologize for wasting your time with a worthless
question.

<snip>

Just be sure you don't overtax your CPM.  20/27.45 = 73%,
but if you start adding in UARTs, etc, you might be getting
close to the edge.

<snip>

quoted

I can live with the fact that IDMA can not utilize the
bus 100% of the time as long as it __relinquish the bus__
at all times it does not perform __full speed__ data
movements. Actually I prefer it does just that.

<snip

quoted

quoted

Er, you're doing DMA to/from a memory.  The timing of that
memory controls /TA.  If you're using your DRAM with one
of the UPMs, and you're targeting that DRAM with IDMA, it
uses the UPM to control the DRAM. (For a flyby-mode transaction).

<snip>
Noah Misch
nmisch@erols.com

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