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TUSB2046B: USB Memory Recognition Fail

Part Number: TUSB2046B

Hi,

Customer is encountering problem regarding the device. Below is the summary.

Problem
1) The mouse and keyboard recognize, but not the USB memory stick.
2) It is recognized when connecting a memory stick by connecting a USB HUB to the outside.

Mouse & Keyboard <--> TUSB2046B <--> Processor : recognize
Memory Stick <--> TUSB2046B <--> Processor : Unrecognizable
Memory Stick <--> USB HUB <--> TUSB2046B <--> Processor :  recognize

Thank you in advance.

Regards,
Maynard