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Altera_Forum's avatar
Altera_Forum
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11 years ago

Using SPI on Qsys

Hi, I want to use a DEO NANO FPGA to send a stream of data to an external device (a DDS). I want to use the SPI core Qsys. My address word is 8 bit long and then the data I have to send is 32bi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

You mention Qsys - can I assume you're using a Nios? Where does the Nios code execute from? The external SDRAM?

Assuming so, you'd put an appropriate data array in your software - which would result in your data being stored in the SDRAM.

If you're not using a Nios then you need to solve it another way, probably by instantiating a ROM in the FPGA and implementing a small state machine to read the data from ROM and throw it at the SPI interface.

A little more project detail will be helpful.

Cheers,

Alex