[SI-LIST] Re: why do one need PRBS Rx AND Tx?
- From: "Ghazzali Majeed" <gmajeed@xxxxxxxxxxxx>
- To: roymesi@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 20 Jun 2005 10:19:02 -0700
- You will need transmit PRBS generator so that you can send random data
pattern out the line side and have it looped back/received at tester to =
check
the board functionality i.e. front end design. The looped back data is
received by receiver and checked against the transmitted pattern for any
errors.
- I think, by receive PRBS, it could be transmit PRBS for system side. =
This
way you can check the functionality of interface between your =
transceiver and
the ASIC/FPGA.
One of the advantages of PRBS generators is that you don't need =
expensive
equipment for testing the board functionality. At the end of day, you =
would
need equipment to do all of the DVT but it's a quick way of checking the
board/chip health.=20
Thanks,
Ghazzali
Broadcom Corp.
=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Roy Messinger
Sent: Monday, June 20, 2005 6:46 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] why do one need PRBS Rx AND Tx?
Hi,
I'm looking at some data sheet of a cross point switch (of Mindspeed) =
which=20
i need for something i'm working on and there's a fucntion called PRBS=20
Tx/Rx. Now, I'm a newbie in this busyness, so I've tried to look at the =
net,=20
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=20
this link
*//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=20
understand why I need 2 components. The goal is to check the crosspoint =
and=20
so we need a PRBS to make a random pattern of signals, which get inside =
the=20
cross point switch to check its functionality (am i right here?). But =
why=20
should I need receive PRBS and transmit?=20
any ideas?
Thanks!
Roy
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=20
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