MK64 USB+emmc 模拟U-disk，拷出数据速度

[OneByte]

哈喽，大家好，在使用MK64 芯片，用更改SDK中的USB +emmc 模拟成U-disk，发现拷入和拷出数据速度只有500k，有哪些方式可优化？请教一下大家。

注释：

emmc的Vccq 电压3.3v ，4bit，尝试更改full-speed和speed-high等不明显。

[OneByte · Accepted solution]

i get it ,USB of MK64 only support full_speed or low_speed ,it is not supporting high speed .the fast speed of full_speed is 12Mbit/s,so we can do nothing for it.

[vicentegomez]

Can you please put  your question in English?

[OneByte]

usb-project of sdk use SD-card,but i change sd to emmc.
Vccq of emmc pull high to 3.3v，high speed of emmc should be connceted to 1.8V（Does this have an impact

？）

[OneByte]

How to improve USB copy speed by simulating u-disk using MK64 USB MSC SDK