Chuck,
Correct. In the IBIS standard we use three terms, Repeater, Redriver and
Retimer.
A Repeater is either a Redriver or a Retimer. A Retimer recovers and then
regenerates the signal. A Redriver amplifies the signal, and this
amplification can either be linear, or nonlinear.
Walter
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Chuck Corley
Sent: Saturday, December 12, 2015 10:04 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: redriver issue
Hi Jun;
For your discussion there are several types of devices. There are
"redrivers" which primarily rebuffer signals for amplititude, and then there
are also "retimers" which recover and regenerate the signals. The names for
these functions can vary between manufacturers.
Chuck
Chuck Corley
National Instruments
On 2015-12-12 03:27, jun zhang wrote:
Hi all,------------------------------------------------------------------
I think redriver is an old and still difficult topic.
we approach in simulation, redriver can amplify amplitude but reduce
timing margin case.
Also in test, we approach the case when adding in redriver, TX can't
find RX.
In redriver chip side, there are different kinds of redrivers:
limiting redriver and linear redriver.
It also seems the effects of redrivers are sensitive to positions it
locates, expecially for limiting redriver.
We may ship products that can work for PCIE Gen2 but fail for Gen3.
Because
of shipment already, we can't add redrivers in our products. So it is
an awkard situation when we want to run higher speed on our products.
So I hope you can share some successful experiecnes on this topic.
When we judge that the insertion loss of the link is high, the first
thought is adding redriver. But do we need to think more before adding
redrivers?
Are
we afraid that adding redriver will give even worse effects? What
kinds of redrivers are most suitable to our link?
Hope to your discussion on this interesting topic
--
best wishes,
Jun Zhang
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