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Altera_Forum
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13 years ago

Performance of SPI SD Controller

Hi, I am planning on using SD card and FAT library with my Altera design. SPI mode seems the simplest variant of all, so google'd for some benchmarking of this mode. The only one I could find w...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

If I recall, SD over SPI is pretty slow because it is not streaming. Add to that the FAT protocol overhead and formatting. See if you can increase the block size to get a better data:overhead ratio. You may want to look into 4-bit SD mode with DMA engines instead.