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Message
From: Ash <anangia@m...>
Date: Fri, 7 Nov 2003 02:25:18 +0100
Subject: Re: [usb] connection to the Transciever
> Thank you for you guys reply, however i do have a bit confused:
>
> 1. For the signal from the transciever, somehow we can know the
> logic '1' or logic '0' from the signal VM and VP , why do we still
> need the
> signal pin RCV?
I don't know if this answers the question or not, but from what i
understand (reading the USB Complete book) there is a truth table
regarding VM and VP which is as follows:
----------------
VP, VM => Result
----------------
0, 0 => SE0
0, 1 => Low Speed (1.5Mb/s)
1, 0 => High Speed (12Mb/s)
1, 1 => Error
----------------
So from this it can be seen that VP and VM are used to tell the physical
layer what speed the device is. This is my understanding. I could be
wrong.
>
> 2. In the PHY core wirtten by Rudolf , He is checking the sync
> packet "00000001" which should recieve"01010100" before NRZI
decode
> by watching the signal rxdn and rxdp , why don't we check this
> packet
> by using the signal rxd ?
Sorry I haven't even touched this yet. I have taken for granted that the
core does everything properly.
>
> Thank you very much for your kindly help
>
Enoy :)
>
> ----- Original Message -----
> From: Ash <anangia@m... >
> To: usb@o...
> Date: Thu, 6 Nov 2003 21:46:18 +0100
> Subject: Re: [usb] connection to the Transciever
>
> >
> >
> > Hi Tomko
> > Rudi helped me out with this. I'm using the exact transceiver
> > (PDIUSBP11A) as you so here you go.
> >
> > The connections are as follow:
> > OE <-> txoe
> > VMO <-> txdn
> > VPO <-> txdp
> > RCV <-> rxd
> > VM <-> rxdn
> > VP <-> rxdp
> >
> > Enjoy
> > Ash :)
> >
> > ----- Original Message -----
> > From: tomko81@h...
> > To: usb@o...
> > Date: Thu, 6 Nov 2003 07:19:27 +0100
> > Subject: [usb] connection to the Transciever
> >
> > >
> > >
> > > Hi,
> > > I am now trying the PHY core with the PDIUSBP11A
> > transciever,
> > > would you mind telling me how i should connect the wire?
> > > Can i know is that the rxd signal is connect to RCV ,
> rxdp is
> > > connected
> > > to VP and rxdn is connected to VM ?
> > >
> > >
> > >
> > > thank you very much
> > >
> >
>
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