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Altera_Forum's avatar
Altera_Forum
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15 years ago

DMA & FIR Filter, some questions.

Hello everyone, I'd like to implement a FIR filter (because it's easy to start with) in DSPBuilder. It should make use of DMA. I finally want to integrate it into an NIOS II based system using ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Okay, now it works. I had marked the "extended feature" checkbox in the SOPC configuration of the dispatcher core. But on the software side I used the standard descriptor. It shows that you MUST use the extended descriptor as soon as you enable the extended feature checkbox. The documentation was not 100% clear about this, only: "In order to use the extended format you must select 'enhanced features' in the dispatcher...". I probably assumed that the standard descriptor is simply defaulting to certain values, when used in "extended" mode.

Second thing I noticed is that when you open the included quartus example project, the DMA is wired incorrectly. E.g. the Dispatcher-READ-Response-Sink is connected to the WRITE-master-response-port. Can you confirm this? I attached a picture... there I just opened the freshly unzipped example project.

Regards,

Sebastian