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C6748's USB 2.0 Port : Very low data transfer rate

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Dear All,
I've a question about the data transfer rate of the USB 2.0 port on C6748. Based on Starterware's USB example code usb_dev_serial, I've written a simple FW which does nothing but generates and sends 1MByte of data to a Windows 7 Host. It is surprise that the average data rate is only around 127 KByte/s. As that piece of code is rather simple, I'm wondering if this symptom is cuased by the performance limitation of Starterware USB library? If not, could anyone kindly provide any suggestion?

Regards,

Oliver


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