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SPI to the SD card specifications
#1
Does anybody know what the SPI running the CD card is capable of? SD interfaces range from 1 to 4 lanes and single to quad data rates in the 20-104mhz range.

Just looking for a high data throughput interface for a peripheral that doesn't require the overhead of USB framing.
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#2
According to schematic, the SDCard is attached in QIO mode, but we still need to figure out if software use it that way.
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#3
(05-08-2017, 08:47 AM)martinayotte Wrote: According to schematic, the SDCard is attached in QIO mode, but we still need to figure out if software use it that way.

I'm quite busy the next few weeks but I may dig through the curated linux kernel modules and figure out how they are running the SD card. QSPI is pretty standard and given the specs say they support 256gig cards I imagine its QSPI >60MHZ for a minimum 15mb/s transfer rate. Theoretically, you can run a QSPI at 100MHZ with quad data rate to achieve 100mb/s throughput sans error checking.
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#4
Question what speed sd card do you recommend for the pine book? All that it States in the wiki is that it is sdxc compatible.

Sent from my SAMSUNG-SM-G920A using Tapatalk
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