Running the 823 FADS board @ 72 MHZ

Running the 823 FADS board @ 72 MHZ

[Kirk Haderlie]

We are trying to run the FADS board @ 72MHz and enjoying the infamous UPM
tables.  Has anyone successfully run the FADS board at this speed and if so
would you be willing to share your UPM tables.  We  are trying to set them
up for the SDRAM and 60-ns EDO DRAM.

Kirk Haderlie
kirk@vividimage.com
Vivid Image Engineering


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Re: Running the 823 FADS board @ 72 MHZ

[Richard Hendricks]

The FADS board are not designed to run at that speed.  Just for kicks,
I've tried seeing how fast I can go without problems.  At about 60 MHz
the SDRAM no longer works, and 68 MHz the DRAM starts not working.  This
is with the default 50 MHz tables.  With better tuning, it may be
possible
to go higher, but I doubt you could reach 72 MHz with the FADS.

Kirk Haderlie wrote:
>
> We are trying to run the FADS board @ 72MHz and enjoying the infamous UPM
> tables.  Has anyone successfully run the FADS board at this speed and if so
> would you be willing to share your UPM tables.  We  are trying to set them
> up for the SDRAM and 60-ns EDO DRAM.
>
> Kirk Haderlie
> kirk@vividimage.com
> Vivid Image Engineering
>

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RE: Running the 823 FADS board @ 72 MHZ

[Kirk Haderlie]

Are you aware of a development board that is running the faster speed CPU's?
We need the faster speed for our application.

-----Original Message-----
From: Richard Hendricks [mailto:richard.hendricks@motorola.com]
Sent: Friday, June 09, 2000 9:44 AM
To: 'linuxppc-embedded@lists.linuxppc.org'
Subject: Re: Running the 823 FADS board @ 72 MHZ



The FADS board are not designed to run at that speed.  Just for kicks,
I've tried seeing how fast I can go without problems.  At about 60 MHz
the SDRAM no longer works, and 68 MHz the DRAM starts not working.  This
is with the default 50 MHz tables.  With better tuning, it may be
possible
to go higher, but I doubt you could reach 72 MHz with the FADS.

Kirk Haderlie wrote:
>
> We are trying to run the FADS board @ 72MHz and enjoying the infamous UPM
> tables.  Has anyone successfully run the FADS board at this speed and if
so
> would you be willing to share your UPM tables.  We  are trying to set them
> up for the SDRAM and 60-ns EDO DRAM.
>
> Kirk Haderlie
> kirk@vividimage.com
> Vivid Image Engineering
>

--
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Re: Running the 823 FADS board @ 72 MHZ

[Richard Hendricks]

I do not know of any *development* board that is running the faster
speed CPU's in 1:1 mode.  I *do* know several customers are running
their designs at 66 MHz 1:1.  There is also at least 1 customer I
know of running 75 Mhz 1:1 without problems.  I wrote an application
note describing how to do a high-speed SDRAM interface to the MPC823.
Hint: PC66 will NOT work at 66 MHz.  PC100 in most cases won't even
work at 75 MHz.  If you are interested in the app note, I recently
published it on comp.sys.powerpc.tech

Kirk Haderlie wrote:
>
> Are you aware of a development board that is running the faster speed CPU's?
> We need the faster speed for our application.
>
> -----Original Message-----
> From: Richard Hendricks [mailto:richard.hendricks@motorola.com]
> Sent: Friday, June 09, 2000 9:44 AM
> To: 'linuxppc-embedded@lists.linuxppc.org'
> Subject: Re: Running the 823 FADS board @ 72 MHZ
>
> The FADS board are not designed to run at that speed.  Just for kicks,
> I've tried seeing how fast I can go without problems.  At about 60 MHz
> the SDRAM no longer works, and 68 MHz the DRAM starts not working.  This
> is with the default 50 MHz tables.  With better tuning, it may be
> possible
> to go higher, but I doubt you could reach 72 MHz with the FADS.
>
> Kirk Haderlie wrote:
> >
> > We are trying to run the FADS board @ 72MHz and enjoying the infamous UPM
> > tables.  Has anyone successfully run the FADS board at this speed and if
> so
> > would you be willing to share your UPM tables.  We  are trying to set them
> > up for the SDRAM and 60-ns EDO DRAM.
> >
> > Kirk Haderlie
> > kirk@vividimage.com
> > Vivid Image Engineering
> >
>
> --
> MPC823 Applications Engineering Development
> Get help from other MPC823 customers on the
> comp.sys.powerpc.tech newsgroup!
>

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Re: Running the 823 FADS board @ 72 MHZ

[Steve Rossi]

I've got a custom 823 board running on the bench at 80MHz 1:1 with PC100 SDRAM
with no problems but I had to re-program the UPM to do it. 50MHz is a sweet spot
(at least with my memories), but above 50MHz without re-programming the UPM
you're probably violating SDRAM timing somewhere.

Steve


Richard Hendricks wrote:

> I do not know of any *development* board that is running the faster
> speed CPU's in 1:1 mode.  I *do* know several customers are running
> their designs at 66 MHz 1:1.  There is also at least 1 customer I
> know of running 75 Mhz 1:1 without problems.  I wrote an application
> note describing how to do a high-speed SDRAM interface to the MPC823.
> Hint: PC66 will NOT work at 66 MHz.  PC100 in most cases won't even
> work at 75 MHz.  If you are interested in the app note, I recently
> published it on comp.sys.powerpc.tech
>
> Kirk Haderlie wrote:
> >
> > Are you aware of a development board that is running the faster speed CPU's?
> > We need the faster speed for our application.
> >
> > -----Original Message-----
> > From: Richard Hendricks [mailto:richard.hendricks@motorola.com]
> > Sent: Friday, June 09, 2000 9:44 AM
> > To: 'linuxppc-embedded@lists.linuxppc.org'
> > Subject: Re: Running the 823 FADS board @ 72 MHZ
> >
> > The FADS board are not designed to run at that speed.  Just for kicks,
> > I've tried seeing how fast I can go without problems.  At about 60 MHz
> > the SDRAM no longer works, and 68 MHz the DRAM starts not working.  This
> > is with the default 50 MHz tables.  With better tuning, it may be
> > possible
> > to go higher, but I doubt you could reach 72 MHz with the FADS.
> >
> > Kirk Haderlie wrote:
> > >
> > > We are trying to run the FADS board @ 72MHz and enjoying the infamous UPM
> > > tables.  Has anyone successfully run the FADS board at this speed and if
> > so
> > > would you be willing to share your UPM tables.  We  are trying to set them
> > > up for the SDRAM and 60-ns EDO DRAM.
> > >
> > > Kirk Haderlie
> > > kirk@vividimage.com
> > > Vivid Image Engineering
> > >
> >
> > --
> > MPC823 Applications Engineering Development
> > Get help from other MPC823 customers on the
> > comp.sys.powerpc.tech newsgroup!
> >
>
> --
> MPC823 Applications Engineering Development
> Get help from other MPC823 customers on the
> comp.sys.powerpc.tech newsgroup!
>

--
-------------------------------------------------------
Steven K. Rossi                     srossi@ccrl.mot.com
Staff Engineer
Multimedia Communications Research Laboratory
Motorola Labs
-------------------------------------------------------


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Re: Running the 823 FADS board @ 72 MHZ

[Richard Hendricks]

Most PC100 memory has a Cl latency of 8ns.  The MPC8xx family has a
setup-time of 6ns.  This gives a maximum frequency of 1/(8+6ns) = 71MHz.
I have recently seen "PC100" memory with a Cl latency of 6ns, which
gives
you 83 MHz.  After talking with the design team, they say the setup
time is probably closer to 5.4ns in real-life, which gives 74MHz and
87MHz (theoretically, only looking at setup-time).  This assumes, of
course, no trace delays or excessive bus capacitance.  I wouldn't
productize a design that used its memory outside of spec.  It is fun
to play with though.

Steve Rossi wrote:
>
> I've got a custom 823 board running on the bench at 80MHz 1:1 with PC100 SDRAM
> with no problems but I had to re-program the UPM to do it. 50MHz is a sweet spot
> (at least with my memories), but above 50MHz without re-programming the UPM
> you're probably violating SDRAM timing somewhere.
>
> Steve
>
> Richard Hendricks wrote:
>
> > I do not know of any *development* board that is running the faster
> > speed CPU's in 1:1 mode.  I *do* know several customers are running
> > their designs at 66 MHz 1:1.  There is also at least 1 customer I
> > know of running 75 Mhz 1:1 without problems.  I wrote an application
> > note describing how to do a high-speed SDRAM interface to the MPC823.
> > Hint: PC66 will NOT work at 66 MHz.  PC100 in most cases won't even
> > work at 75 MHz.  If you are interested in the app note, I recently
> > published it on comp.sys.powerpc.tech
> >
> > Kirk Haderlie wrote:
> > >
> > > Are you aware of a development board that is running the faster speed CPU's?
> > > We need the faster speed for our application.
> > >
> > > -----Original Message-----
> > > From: Richard Hendricks [mailto:richard.hendricks@motorola.com]
> > > Sent: Friday, June 09, 2000 9:44 AM
> > > To: 'linuxppc-embedded@lists.linuxppc.org'
> > > Subject: Re: Running the 823 FADS board @ 72 MHZ
> > >
> > > The FADS board are not designed to run at that speed.  Just for kicks,
> > > I've tried seeing how fast I can go without problems.  At about 60 MHz
> > > the SDRAM no longer works, and 68 MHz the DRAM starts not working.  This
> > > is with the default 50 MHz tables.  With better tuning, it may be
> > > possible
> > > to go higher, but I doubt you could reach 72 MHz with the FADS.
> > >
> > > Kirk Haderlie wrote:
> > > >
> > > > We are trying to run the FADS board @ 72MHz and enjoying the infamous UPM
> > > > tables.  Has anyone successfully run the FADS board at this speed and if
> > > so
> > > > would you be willing to share your UPM tables.  We  are trying to set them
> > > > up for the SDRAM and 60-ns EDO DRAM.
> > > >
> > > > Kirk Haderlie
> > > > kirk@vividimage.com
> > > > Vivid Image Engineering
> > > >
> > >
> > > --
> > > MPC823 Applications Engineering Development
> > > Get help from other MPC823 customers on the
> > > comp.sys.powerpc.tech newsgroup!
> > >
> >
> > --
> > MPC823 Applications Engineering Development
> > Get help from other MPC823 customers on the
> > comp.sys.powerpc.tech newsgroup!
> >
>
> --
> -------------------------------------------------------
> Steven K. Rossi                     srossi@ccrl.mot.com
> Staff Engineer
> Multimedia Communications Research Laboratory
> Motorola Labs
> -------------------------------------------------------

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Re: Running the 823 FADS board @ 72 MHZ

[Wolfgang Denk]

In message <319E391E2049D311843500609457383D07FC48@exchange.vividimage.com> you wrote:
>
> Are you aware of a development board that is running the faster speed CPU's?
> We need the faster speed for our application.

The TQM8xxL mini-modules are available with up to 80MHz CPU's.
Contact me if you need a quote.

Be warned: I haven't tried them extensively so far, nor have I seen a
problem where the higher  CPU-speed  overcompensated  the  impact  of
having just half the bus speed.

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"Wish not to seem, but to be, the best."                  - Aeschylus

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