why my bulk device can not work at normal transfer speed without Hub? | Cypress Semiconductor
why my bulk device can not work at normal transfer speed without Hub?
i'm using cy7c64215 to drive an OLED device with data from PC usb port. but it is very strange if i do not connect my device through a Hub, the transfer speed will be very slow, 1.7Frame/second. however, if i plug it in though a USB Hub, the transfer speed can be 11Frames/second. is this a driver issue or a firmware issue?
how to work around?
Thank you in advance,