[SI-LIST] Re: which type of power(core logic power or I/O power) has a high priority
- From: "Brad Crowell" <bcrowell@xxxxxxxxxxx>
- To: <Ken.Cantrell@xxxxxxxxxxxxxxxx>, <weirsi@xxxxxxxxxx>, <chand_374@xxxxxxxxx>, <zhuyongfa@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 13 Sep 2006 11:03:42 -0300
Ken,
But is that for IO or core power that is the most important? Which device is
the biggest concern is a different question than which power rail to a given
device is the biggest concern.
Brad
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Ken Cantrell
Sent: Wednesday, September 13, 2006 10:46 AM
To: weirsi@xxxxxxxxxx; bcrowell@xxxxxxxxxxx; chand_374@xxxxxxxxx;
zhuyongfa@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Cc: jinzhaoguo@xxxxxxxxxx; 'zhang kun@huawei'
Subject: [SI-LIST] Re: which type of power(core logic power or I/O power)
has a high priority
Brad -
Read the data sheet for the parts involved. See how much current and at
what dI/dt each chip uses. The one(s) with the most/fastest current
consumption are the ones that take priority.
Ken
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of steve weir
Sent: Wednesday, September 13, 2006 6:06 AM
To: bcrowell@xxxxxxxxxxx; chand_374@xxxxxxxxx; zhuyongfa@xxxxxxxxxx;
si-list@xxxxxxxxxxxxx
Cc: jinzhaoguo@xxxxxxxxxx; 'zhang kun@huawei'
Subject: [SI-LIST] Re: which type of power(core logic power or I/O
power) has a high priority
Brad, I think you didn't see other responses because there is no correct
rule of thumb answer. At the end of the day, one needs to analyze the
requirements for all supplies. Often I/O needs priority. But, that is not
something to depend on.
Steve.
At 04:47 AM 9/13/2006, Brad Crowell wrote:
>I didn't see any other responses go by and was wondering if their were
>any other opinions on this matter. From a PCB perspective, I would
>suggest that the IO power would be more important. Not to suggest that
>core power isn't also important, but there is less the PCB designer can
>do to affect the quality of core power on an IC. To some degree, if the
>chip designer hasn't taken care of the power supply design of the
>IC/package, then the PCB
cannot
>fix it. Alternatively, the outputs are what induce currents on the PCB
>and what the PCB designer should be more concerned with. I would be
>interested in hearing other opinions.
>
>Thanks
>Brad
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx
>[mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of chand basha
>Sent: Wednesday, September 06, 2006 6:45 AM
>To: zhuyongfa@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
>Cc: jinzhaoguo@xxxxxxxxxx; zhang kun@huawei
>Subject: [SI-LIST] Re: which type of power(core logic power or I/O
>power) has a high priority
>
>zhuyongfa
> its core logic power which will get the highest priority.(for
>stabilised operation of the device)
>
> Thanks
> chand
>
>
>z46147 <zhuyongfa@xxxxxxxxxx> wrote:
> Hi everyone,
>In pcb design, there are several type of power(core logic power, I/O
power).
>In some designs we can not provide GND planes for each power type, when
that
>happens, which power type(core logic power, I/O power) we should give
>priority to close with GND plane? As we all know, core logic power
>always gives rise to EMI problem, and
>
>Thanks and regards!
>
>Zhuyongfa
>Huawei Technologies Co., Ltd.
>Bantian, Longgang District
>Shenzhen 518129, P.R.China
>Tel:+86-755-89650717
>mail:zhuyongfa@xxxxxxxxxx
>
>
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