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K66 Development Board USB HS Interface

Question asked by Charles Lin on Feb 24, 2020
Latest reply on Feb 24, 2020 by Sabina Bruce

I got confused on the advertised high speed usb port on the K66. I know there are two MCUs on the board, K20 and K66. And according to the schematic, one usb connecting to K20, which only provides full speed. Another one is connecting to the K66 full speed (USB1_DM, USB1_DP), and the actual high speed pins left at floating (USB0_DP,USB0_DM). 


There is no high speed usb connection on the schematic, but when I tested the examples, like device_composite_cdc_msc_sdcard, I can see the speed difference when changing settings of EHCI and KHCI on the firmware. Why does it behave like this?