Re: Mapping of request Vs response in USB Asynchronous driver

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On Tue, Aug 4, 2009 at 8:08 PM, Ramya Desai<ramya.desai@xxxxxxxxx> wrote:
> Dear all,
>
> I am developing an asynchronous driver for custom mass storage device.
> I can issue two read commands one after another, without waiting for
> response for the first command.
> Where as my device can respond to second request first, and to the
> first request at later point of time.
> In this scenario, I am getting read values swapped. i.e, the buffer of
> the first request is being filled with the data of second request and
> vice versa.
>
> Can anyone say, is this the expected behaviour of USB stack ? or do I
> need to do any thing else to fix this.

I understand "USB stack" you mean in the above line is USB Host Stack.
 Does host stack have "intelligence/awareness" that the device can
reply in any order ?

Is the transfer by the device on is bus proper ?

> Thanks and regards,
> RD
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