C5505 DMA - DARAM or SARAM?

Todd Anderson78572

All:

I have 5 DMA buffers, and I have found that to get the best use of DMA, these 5 buffers need to be in separate memory segments. However, are there any benefits of DARAM over SARAM when setting up the buffers?

I would rather be able to use SARAM segments for the 5 buffers. That way, I do not have to specify separate sections in the DARAM.

By the way, this is a DSP/BIOS-based project. Previously, I had 4 memory segments defined:

DARAM

SARAM0

SARAM1

SARAM2

If DARAM does not need to be used for my DMA buffers, I would like to reserve it for specific use where it would be beneficial.

over 12 years ago

0 Vasantha K over 12 years ago

TI__Genius 12575 points

Hello Todd,

The advantage of DARAM over SARAM is with performance:

Each DARAM block can perform two accesses per cycle (two reads, two writes, or a read and a write). DARAM can be accessed by the internal program, data, or DMA buses.

Hope this helps

Regards

Vasanth

0 Todd Anderson78572 over 12 years ago in reply to Vasantha K

Guru 14640 points

Vasanth:

i am using the Dma to send/receive from I2S, and send via UART. From what you stated, it does not appear that there is n inherent advantage to using DARAM. Since there is a lot more SARAM on the C5505, it looks like I could use 5 segments from SARAM, and save DARAM for more important items that could take advantage of the 2 access capabilities.

0 Vasantha K over 12 years ago in reply to Todd Anderson78572

TI__Genius 12575 points

Todd,

Yes, that looks correct.

Regards

Vasanth

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C5505 DMA - DARAM or SARAM?