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Altera_Forum's avatar
Altera_Forum
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21 years ago

DMA Controller

Does the DMA Controller support streaming byte datawidths from a peripheral to word datawidths for memory? In other words does it support the avalon bus capability of mixing the two bus sizes. Where ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

jasonm,

I'm not completely sure I understand your question, but I'll take a stab at it:

DMA transfers go at whatever data size is specified in the control register. If you read from a 32-bit SDRAM and write to an 8-bit peripheral (say, a UART), you'd set the control register BYTE bit, and both reads and writes would be done byte-by-byte.

So,

"In other words does it support the avalon bus capability of mixing the two bus sizes" - Yes.

"Where it will buffer 4 bytes then does a single memory write" - No.