[SI-LIST] Re: why do one need PRBS Rx AND Tx?

Roy, one PRBS unit acts as a generator, and the other a checker.  The 
receive data is not time aligned to the transmit, and so a separate unit is 
needed.  The basic operation is:  transmitter inserts the PRBS pattern into 
the data stream.  The receiver PRBS generator has a synchronization state 
machine ( shift register ) that initializes state on the incoming stream 
and then free runs until there are too many errors, in which case it will 
resync.

Steve.
At 03:46 PM 6/20/2005 +0200, Roy Messinger wrote:
>Hi,
>I'm looking at some data sheet of a cross point switch (of Mindspeed) which
>i need for something i'm working on and there's a fucntion called PRBS
>Tx/Rx. Now, I'm a newbie in this busyness, so I've tried to look at the net,
>finding some material about this PRBS. I did find an exact definition at *
>www.wikipedia.com* <http://gmail.google.com/gmail/www.wikipedia.com> and at
>this link 
>*http://www.freelists.org/archives/si-list/03-2004/msg00289.html*<http://www.freelists.org/archives/si-list/03-2004/msg00289.html>
>But my component has 2 PRBS built inside. One for Rx and one for Tx. I don't
>understand why I need 2 components. The goal is to check the crosspoint and
>so we need a PRBS to make a random pattern of signals, which get inside the
>cross point switch to check its functionality (am i right here?). But why
>should I need receive PRBS and transmit?
>any ideas?
>Thanks!
>Roy
>
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