OPENCORES.ORG

-----Original Message-----

Everything mentioned in your mail seems fine other than the 500 ms pause.

The host first requests the device descriptor, it requires at least 8 bytes.
You can send 18 but all the host is after is the control endpoint size held
within the first 8 bytes.

It might be best now if you post the 18 bytes of information that you return
as im sure this is why the host is waiting so long.

Thanks
Steve

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> -----Original Message-----
> From: usb-bounces@o... [mailto:usb-bounces@o...]On
> Behalf Of P.Ravi
> Sent: 25 February 2004 07:37
> To: usb@o...
> Subject: [usb] Enumeration
>
>
> Hi
>
>   Is there any difference if we send 18 bytes of data instead of 8 bytes
> when host requests for device
>   descriptors after reset.
>
>   Can anybody explain what exactly is happening here
>
>   host - > reset
>   host  -> request for device descriptors
>   device  -> responding with 18 bytes of device descriptor
>   host -> reset
>   device -> set address to 4
>   host -> reset
>
>  Please note that acks are present but not mentioned. There is no nack
> either from device or host.
>
> Instead of another request form host for device descriptors its issuing
> reset.
>
>  After set_address there is 549.673 ms silence and then host is sending
> reset.
>
> Please help
>
> Thanks in advance.
>
> regards
>
>
>
>
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