Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

TSE with the dual SGDMA modules...

Hi All, I guess I am uncertain how the TX/RX dma's work on the TSE - specifically I am looking to be able to read a few bytes out of a packet, use these bytes to select a memory mapped data str...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

You would have to modify the TSE driver to do that, but it should be possible.

You could prepare a first descriptor for the SGDMA asking to load only the first bytes you require, and then when you decide what to do with the data, create a second descriptor to load the remaining bytes in the packet. You can have a look at the sgdma datasheet (http://www.altera.com/literature/hb/nios2/qts_qii55003.pdf) to see how it works.