> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Shawn Wilton
> Sent: Tuesday, November 07, 2006 2:23 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] USB device detected at wrong speed
> 
> Have you checked your trace impedances for reflections?  I'm 
> not positive, but it may be possible that at higher speeds 
> it's so noisy that the host automatically downgrades you.

Hi Shawn, I laid out the USB traces according to the USB spec so they'd
be the correct impedance, and put a ground plane/fill below them.  They
should be right but I don't have a scope at home so haven't been able to
look at them.  I have a scope at work and will bring the board in to
check.  I also need to verify the xtal is operating correctly, that's a
suggestion from the microchip board that I haven't been able to check
yet.

thanks,
--steve


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