[SI-LIST] Re: What will happen when short the SERDES IO to GND?
- From: "Ward, Richard" <richard.ward@xxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>, liuluping 41830 <liuluping@xxxxxxxxxx>
- Date: Thu, 10 Jul 2008 00:12:34 -0500
As Steve says - it depends.
Many XAUI style output drivers use majority passive termination to positive=
supply. By connecting the output nods to gnd you'll be bypassing the curre=
nt control stage and starve it.
Most nodes should survive with the (usually) 50 Ohms between rails for shor=
t times. Most will meet the hot plug protection rules. Long times on smalle=
r feature sizes could permanently damage the die due to the high electro-mi=
gration. Depends on the design/linewidths. ESD doesn't tend to catch these =
events unless spikes at insertion/removal occur as well. But assumed you me=
ant a DC short.
"short" or "terminate"? - big difference naturally.
Short will likely kill the signals, risks damage over time, terminate will =
likely give collapsed swing at best.
Regards,
Richard
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On=
Behalf Of steve weir
Sent: 09 July 2008 21:43
To: liuluping 41830
Cc: si-list@xxxxxxxxxxxxx; wangyongjin@xxxxxxxxxx
Subject: [SI-LIST] Re: What will happen when short the SERDES IO to GND?
The answer depends on the specific driver design. If it is a CML driver
as is common, the pull-up will heat up more than usual. Whether that is
a problem or not depends on how the IC mfg sized the pull-up.
Steve.
liuluping 41830 wrote:
> Dear all :
>
> What will happen when short the working SERDES IO,e.g.XAUI, without =
AC capacitor to GND ?
> Will the ESD circuit working to prevent chip damaging?Are there any pape=
rs related to this problem?
>
> Thanks and Regards,
>
> LIU Luping
>
>
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