Re: Re: [usb] Latency for ACK/NAK/STALL

[Ravi Kumar <ravikumar_vlsi@yahoo.co.in>]

hi folks
in usb 1.0 protocol:
The number of device we can totally connect is 127
if i use 10 hubs , how many devices can be connected 
is it 

1)127 devices
or 
2)127 - 10 ( Hubs ) = 117 devices

my objective of this question :
is there a dedicated addressing for hub & for devices
?.

Regards
Ravikumar



 --- senthil  nadesan <senthilnadesan@rediffmail.com>
wrote: > Hi rudi,
>    The host could send ack in response to successful
> completion of 
> IN transaction.
> 
> Senthil
> 
> 
> On Wed, 12 Jun 2002 Rudolf Usselmann wrote :
> >On Wednesday 12 June 2002 00:26,
> govindsrajan@hotmail.com 
> >wrote:
> > > Hi,
> > >
> > >   What is the latency of the device to send
> handshake pkt 
> >after it
> > >   received the command and data. Does the same
> latency hold 
> >good
> > >   for the host when it needs to send ACK ? Does
> this vary for 
> >low/high/
> > >   full speed ?
> >
> >I don't remember the numbers look at the spec.
> >
> >The host does never send N/ACK packets only the
> slave. The 
> >delay
> >does vary for the different speed packets. The
> delay is expressed 
> >in
> >bit clock intervals.
> >
> >rudi
> >
> > >   Thanks
> > >   Govind
> >
> >
> >
> >--
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> 
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