[SI-LIST] Re: which type of power(core logic power or I/O power) has a high priority
- From: steve weir <weirsi@xxxxxxxxxx>
- To: chand basha <chand_374@xxxxxxxxx>,Charles.Grasso@xxxxxxxxxxxx, Ken.Cantrell@xxxxxxxxxxxxxxxx,Brad Crowell <bcrowell@xxxxxxxxxxx>, zhuyongfa@xxxxxxxxxx,si-list@xxxxxxxxxxxxx
- Date: Thu, 14 Sep 2006 00:25:20 -0700
Chand, is that a company wide policy? May I ask what company you work for?
Steve
At 10:52 PM 9/13/2006, chand basha wrote:
>charles,
>your are right both are equally importent.
>but we cant give equal priority to both and its not possible also.
>to ensure the smooth functioning of the board we put more priority to core.
>pcb engg cant do anything to affect the core power but he also cant assure the
>stability of the power ! ! !
>now dont you feel core powe should be stable inorder to work the
>system properly ?
>
>Thanks
>chand
>
>
>
>
>"Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx> wrote:
>I guess I'm confused. Aren't they ALL "important"? The core power and=20
>the I/O power will have defined ripple specifications and so the PDS has
>to be designed to accommodate both.
>
>
>Best Regards
>Charles Grasso
>Compliance Engineer
>Echostar Communications Corp.
>Tel: 303-706-5467
>Fax: 303-799-6222
>Cell: 303-204-2974
>Pager/Short Message: 3032042974@xxxxxxxxx
>Email: charles.grasso@xxxxxxxxxxxx
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Ken Cantrell
>Sent: Wednesday, September 13, 2006 8:22 AM
>To: Brad Crowell; Ken.Cantrell@xxxxxxxxxxxxxxxx; weirsi@xxxxxxxxxx;
>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 -
>The answer is the same on a single part basis.
>Ken
>
>Message-----
>From: Brad Crowell [mailto:bcrowell@xxxxxxxxxxx]
>Sent: Wednesday, September 13, 2006 8:04 AM
>To: Ken.Cantrell@xxxxxxxxxxxxxxxx; weirsi@xxxxxxxxxx;
>chand_374@xxxxxxxxx; zhuyongfa@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
>Cc: jinzhaoguo@xxxxxxxxxx; 'zhang kun@huawei'
>Subject: RE: [SI-LIST] Re: which type of power(core logic power or I/O
>power) has a high priority
>
>
>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 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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