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eMMC to USB adapter "very" slow at reading data
talpa
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07-08-2020, 07:50 AM (This post was last modified: 07-08-2020, 08:22 AM by talpa.)
(07-08-2020, 06:36 AM)roncromberge Wrote: Adapter is only usb2!


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Yes, but shouldn't USB 2 theoretically (aka. marketing lies) be capable of ~50MB/s
According to the data sheet of the GL823 interface chip used it should support both 1 and 4 bit transfers.

However it also states a typical "SD/MMC Card Clock Frequency" of 48MHz i "High Speed Mode" which leaves one with 24MB/s of raw bandwidth to the eMMC if the interface runs in 4x mode.

I suppose protocol overhead could drop this down to 13-16 MB/s :o/
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RE: eMMC to USB adapter "very" slow at reading data - by talpa - 07-08-2020, 07:50 AM

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