MicroSD Speed? (UHS?)
#8
The SD card interface is fixed at 3.3V I/O. To support high speed modes (using clocks beyond 50Mhz) you need 1.8V I/O voltage like on the eMMC interface. You could switch the SD card interface to 1.8V on a design but that removes backwards compatibility with slower/older cards that can only do 3.3V I/O. You could implement a dual level I/O scheme supporting both 1.8V and 3.3V but I haven't seen anyone going through with that on a cheap SBC design. If you want high(er) speed storage on Rock64 you need to go with the USB3 port.
Come have a chat in the Pine IRC channel >>


Messages In This Thread
MicroSD Speed? (UHS?) - by PoV - 07-04-2017, 05:51 PM
RE: MicroSD Speed? (UHS?) - by Luke - 07-04-2017, 05:57 PM
RE: MicroSD Speed? (UHS?) - by PoV - 07-04-2017, 05:59 PM
RE: MicroSD Speed? (UHS?) - by MadScientist_42 - 07-05-2017, 10:00 AM
RE: MicroSD Speed? (UHS?) - by fire219 - 07-04-2017, 06:21 PM
RE: MicroSD Speed? (UHS?) - by joe - 07-05-2017, 08:02 AM
RE: MicroSD Speed? (UHS?) - by MadScientist_42 - 07-05-2017, 10:06 AM
RE: MicroSD Speed? (UHS?) - by xalius - 07-05-2017, 10:08 AM
RE: MicroSD Speed? (UHS?) - by MadScientist_42 - 07-05-2017, 01:40 PM
RE: MicroSD Speed? (UHS?) - by xalius - 07-05-2017, 03:22 PM
RE: MicroSD Speed? (UHS?) - by mcerveny - 08-07-2019, 12:48 PM

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