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USB device is not recognized (LPC3250)

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Hi,

I have downloade the USB HID code of 3180 and configured it 3250
ics.nxp.com/.../code.bundle.lpc3180.keil.zip

I have seen a thread regarding this "USB implementation in LPC3250".I am facing the same problem like "USB DEVICE IS NOT RECOGNIZED" It is not enumerated in the PC.

I would like to know how it is(or can be) resolved?

Also it says "SDRAM ***MUST*** be initialised for USB sample code to work". I did not get how it need to be initialized also.

Thanks in advance.

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