Reply by An Schwob in the USA●October 1, 20082008-10-01
On Sep 27, 3:32=A0pm, "Ulf Samuelsson" <ulf.samuels...@atmel.com> wrote:
> "im" <no@_no_.no> skrev i meddelandetnews:mn.b4a17d890e836e69.31159@no.no=
...
>
> > An Schwob in the USA:
>
> >> May be the LPC3250 from NXP is worth a look. It has the features you
> >> are asking for.
>
> > That were the one I found. I were interested to know if there were
> > obvius alternatives. I think I stick to that.
>
> >> I also found some information about a demoboard from Phytec on the
> >> LPC2000 website.
>
> Just because that the H/W "supports" 1024 x 768 doesnt mean
> that it will run without problems.
> With 16 bits per pixel and a 60 fps update rate you need ~100MB/s
> A 200 MHz ARM926 will typically run with a 100 MHz AHB bus,
> providing a maximum throughput of 400 MB per second.
> Due to overhead, the real bandwidth will be lower than that,
> but my guess would be maybe 250 MB/s real throughput.
>
------- snip --------
> ---
> Best Regards,
> Ulf Samuelsson
> This is intended to be my personal opinion which may,
> or may not be shared by my employer Atmel Nordic AB
Ulf,
totally agree with your statements. Providing the required resolution
does not necessarily mean you can run some sort of video there. I
would also agree with your calculation of the bus-bandwidth. A device
that would require streaming video and let's assume this coming
through Ethernet could have serious problems, if 208 MHz and a bus
with theoretical 400 MB/s bandwidth is all there is.
The requirements were just like a brief copy from the data sheet.
An Schwob
Reply by Ulf Samuelsson●September 27, 20082008-09-27
or may not be shared by my employer Atmel Nordic AB
"Paul Keinanen" <keinanen@sci.fi> skrev i meddelandet
news:ljdtd4teltaqupi11pr7orhgar3im18vgn@4ax.com...
> On Sun, 28 Sep 2008 00:32:01 +0200, "Ulf Samuelsson"
> <ulf.samuelsson@atmel.com> wrote:
>
>>Just because that the H/W "supports" 1024 x 768 doesnt mean
>>that it will run without problems.
>>With 16 bits per pixel and a 60 fps update rate you need ~100MB/s
>>A 200 MHz ARM926 will typically run with a 100 MHz AHB bus,
>>providing a maximum throughput of 400 MB per second.
>>Due to overhead, the real bandwidth will be lower than that,
>>but my guess would be maybe 250 MB/s real throughput.
>
> While a CRT would definitively need at least 60 fps, do you really
> need such frame rates on the LCD, if live video or gaming is not
> required ?
>
> Paul
>
The Hitachi LCD displays on the AT91 kits seems to use this frequency.
Not sure about the exact partnumber, but a device in the family is:
http://www.hitachi-displays-eu.com/doc/TX09D70VM1CEA.pdf
This needs 52-68 Hz.
--
Best Regards,
Ulf Samuelsson
This is intended to be my personal opinion which may,
Reply by Paul Keinanen●September 27, 20082008-09-27
>Just because that the H/W "supports" 1024 x 768 doesnt mean
>that it will run without problems.
>With 16 bits per pixel and a 60 fps update rate you need ~100MB/s
>A 200 MHz ARM926 will typically run with a 100 MHz AHB bus,
>providing a maximum throughput of 400 MB per second.
>Due to overhead, the real bandwidth will be lower than that,
>but my guess would be maybe 250 MB/s real throughput.
While a CRT would definitively need at least 60 fps, do you really
need such frame rates on the LCD, if live video or gaming is not
required ?
Paul
Reply by Ulf Samuelsson●September 27, 20082008-09-27
"im" <no@_no_.no> skrev i meddelandet
news:mn.b4a17d890e836e69.31159@no.no...
> An Schwob in the USA:
>
>> May be the LPC3250 from NXP is worth a look. It has the features you
>> are asking for.
>
> That were the one I found. I were interested to know if there were
> obvius alternatives. I think I stick to that.
>
>
>> I also found some information about a demoboard from Phytec on the
>> LPC2000 website.
>
Just because that the H/W "supports" 1024 x 768 doesnt mean
that it will run without problems.
With 16 bits per pixel and a 60 fps update rate you need ~100MB/s
A 200 MHz ARM926 will typically run with a 100 MHz AHB bus,
providing a maximum throughput of 400 MB per second.
Due to overhead, the real bandwidth will be lower than that,
but my guess would be maybe 250 MB/s real throughput.
You can get the 1024 x 768 running in the lab to show a display,
but if you overload the bus like this, you are likely to see all kinds
of failures due to lack of bus bandwidth,
including lost Ethernet packets and flickering screens.
Marvell PXA2xx also "supports" high resolution, yet many
people redesign their PXA board with an LCD controller
in an external FPGA, once they have seem the performance.
The AT91SAM9G40 and AT91SAM9263 LCD controllers
"supports" 2048 x 2048 displays, but for large displays
you have the secondary bus, which will offload the primary bus.'
The SAM9263 is not a good solution for a dual bus system,
since the secondary bus is limited to 800 x 600 if you
want to keep the 10/100 Ethernet (pin mux problem),but
it should be as good as the NXP part if you want to have
a single bus.
Be prepared to redesign with an external LCD controller, if
you have a single bus system...
---
Best Regards,
Ulf Samuelsson
This is intended to be my personal opinion which may,
or may not be shared by my employer Atmel Nordic AB
Reply by peter_H●September 23, 20082008-09-23
>Which ARM has:
>LCD controller 1024x768
>Ethernet
>uarts, etc
>min. 200 MHz
>
>I need a demo board.
>
>
>Thank you
>
>--
>Tr�t af Outlook Express?
>Pr�v MesNews: http://LexInfo.dk/MesNews/
>
>
>
> May be the LPC3250 from NXP is worth a look. It has the features you
> are asking for.
That were the one I found. I were interested to know if there were
obvius alternatives. I think I stick to that.
> I also found some information about a demoboard from Phytec on the
> LPC2000 website.
Thank you!
Reply by An Schwob in the USA●September 22, 20082008-09-22
On Sep 19, 3:28 pm, im <no@_no_.no> wrote:
> Which ARM has:
> LCD controller 1024x768
> Ethernet
> uarts, etc
> min. 200 MHz
>
> I need a demo board.
>
> Thank you
>
> --
> Tr=E6t af Outlook Express?
> Pr=F8v MesNews:http://LexInfo.dk/MesNews/
Hi,
May be the LPC3250 from NXP is worth a look. It has the features you
are asking for.
I also found some information about a demoboard from Phytec on the
LPC2000 website.
Some quick links for the device http://www.lpc2000.com and for the
related board (and other tools) http://www.lpc2000.com/tools
Cheers, Der Schwob
Reply by Ulf Samuelsson●September 20, 20082008-09-20
1024 * 768 => 90 MB/Second which is a significant part of the
memory bandwidth of a 200 MHz CPU with a 100 MHz bus.
The SAM9261 does not have an Ethernet controller.
The SAM9263 has a secondary bus, but if you try to run
SDRAM on the bus, you will lose the Ethernet due to the pin multitplexing.
If you run a 40 MHz PSRAM, then your bandwidth is too small.
You will be better off with the forthcoming AT91SAM9G40.
This will provide you with a secondary bus with an DDR-II.interface.
Check availability with your local Atmel representative.
--
Best Regards,
Ulf Samuelsson
This is intended to be my personal opinion which may,
or may not be shared by my employer Atmel Nordic AB
Reply by Frank-Christian Kruegel●September 20, 20082008-09-20
On Sat, 20 Sep 2008 00:28:05 +0200, im <no@_no_.no> wrote:
Atmel At91SAM9261,9263
Netsilicon NS9750
Mit freundlichen Gr��en
Frank-Christian Kr�gel
Reply by im●September 19, 20082008-09-19
Which ARM has:
LCD controller 1024x768
Ethernet
uarts, etc
min. 200 MHz
I need a demo board.
Thank you
--
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