[SI-LIST] Re: Minimum length for SERDES
- From: cris_filip2002@xxxxxxxx
- To: "cris_filip2002@xxxxxxxx" <cris_filip2002@xxxxxxxx>, "mickey.felton@xxxxxxx" <mickey.felton@xxxxxxx>
- Date: Fri, 20 Mar 2015 00:17:07 -0600
In other words specs and data sheets are not dealing with physical
constraints. It is your task to convert them in electrical constraints and that
is design specific.
> On Mar 19, 2015, at 11:25 PM, cris_filip2002@xxxxxxxx wrote:
>
> I haven't seen yet such a requirement in any spec. However if this affects
> the IL, RL, ILD, ICR, ICN, COM or eye opening constraints, then you should
> consider it.
>
> Cristian
>
>> On Mar 19, 2015, at 10:40 AM, Felton, Mickey <mickey.felton@xxxxxxx> wrote:
>>
>> Should also consider the max voltage output, and the max input voltage
>> possible. Too little Insertion loss can lead to clipping.
>>
>> -----Original Message-----
>> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
>> Behalf Of Conrad Herse
>> Sent: Thursday, March 19, 2015 11:26 AM
>> To: 'balaseven@xxxxxxxxx'; si-list@xxxxxxxxxxxxx
>> Subject: [SI-LIST] Re: Minimum length for SERDES
>>
>> In my experience I've found that, all other things being equal, shorter
>> channels will exhibit more return loss than longer channels. So, as Chris
>> points out, if you have lots of discontinuities in your channel you could
>> have more trouble meeting return loss requirements with your shorter
>> channels than with your longer channels.
>>
>> Conrad
>>
>>> On 3/19/2015 9:47 AM, Cotton, Chris wrote:
>>> Of course, there could be a minimum requirement because the designer only
>>> chose to validate signal integrity starting at some given length. But I
>>> suspect that what you are really asking is if there is ever a need for a
>>> minimum trace length requirement? I believe the answer is yes. For minimum
>>> lengths, loss (i.e., insertion loss) will be low. If the driver and/or
>>> receiver are mismatched to the channel impedance or if there are
>>> significant discontinuities in the channel then reflections may take many
>>> roundtrips to dampen and this may wreak havoc on your eye.
>>>
>>> Chris
>>>
>>> -----Original Message-----
>>> From: si-list-bounce@xxxxxxxxxxxxx
>>> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of bala
>>> Sent: Thursday, March 19, 2015 10:36 AM
>>> To: si-list@xxxxxxxxxxxxx
>>> Subject: [SI-LIST] Minimum length for SERDES
>>>
>>> Hi all,
>>> Is there any minimum trace length requirement for high speed SERDES?if yes,
>>> why?
>>>
>>> Regards
>>> bala
>>>
>>>
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