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Altera_Forum's avatar
Altera_Forum
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14 years ago

PIO performance

Hi, I use IORD and IOWR to control the PIO and it seems the speed will be no more than 15MHz. Is there any way to accelerate?
Altera_Forum's avatar
Altera_Forum
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14 years ago

It's pretty easy actually. With the DMA you basically read a buffer from memory and have the DMA write to a fixed address. The bit in the control field for writing to a fixed address is called "WCON" I think. There is something similar in the SGDMA but I forget what the bit is called. Take a look at this design, it does something similar: http://www.altera.com/support/examples/nios2/exm-crc-acceleration.html (http://www.altera.com/support/examples/nios2/exm-crc-acceleration.html?gsa_pos=1&wt.oss_r=1&wt.oss=crc)