Reply by Jean-Michel MERCIER●May 15, 20022002-05-15
Hi
You wrote : > For e.g. when I tried a 2D to 1D transfer to move
two columns of 16-
> bit data, it took more than 2.5 times as long as when I tried to same
> transfer as a 1D - 1D tranfer of a column of 32 bit data.
> (using 6711 DSK)
I would say thaht the x2 factor comes from 16-bits / 32-bits change.
When you program your transfer as 16-bits words, the DMA will
do twice the number of memory access.
Jean-Michel MERCIER
Is there some TI resource describing the throughput of EDMA
transfers ? It would be great if there is a definitive way to choose
between two types of transfers, to get the same effect.
For e.g. when I tried a 2D to 1D transfer to move two columns of 16-
bit data, it took more than 2.5 times as long as when I tried to same
transfer as a 1D - 1D tranfer of a column of 32 bit data.
(using 6711 DSK)
I would really appreciate any pointers, advice on this issue.