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Altera_Forum's avatar
Altera_Forum
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8 years ago

Nios II + DMA + OV7670 Camera

Hi everyone, I'm having problems interfacing OV7670 Data to Nios II. The OV7670 Camera, sends pixel data from a PIO D[7:0], and this data is synchronizated with a clock called PCLK, the PCLK ca...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

I recommend leaving the Nios and DMA cores on their own clock domain and just have the data cross clock domains using a FIFO (search for "FIFO" in Qsys and you'll find a couple of them). So you would push the pixels into the FIFO at 24MHz and then have the DMA empty the FIFO at a much higher speed. Make sure to make the FIFO depth large so that you can handle gaps between frames without underflowing.