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From: Maurice Branson on 5 Mar 2010 10:00
Hi folks,

I have been introduced to a project where I have to implement a TFT display
controlller on a low-cost FPGA like Spartan-3 or Spartan-6. The controller
has to support at least XGA - 1024x768, SXGA - 1280x1024, UXGA - 1600x1200
and WUXGA 1920x1200. I have to chose an appropriate platform now. As I am a
total newbie in the field of image processing on FPGAs I would ask you for
your recommendation about size and type of FPGA, especially in terms of
logic for video scaling and SRAM memories for frame buffer storage.

Many thanks in advance.

KR, Maurice


From: Gabor on 5 Mar 2010 10:35
On Mar 5, 10:00 am, "Maurice Branson" <trauben...(a)arcor.de> wrote:
> Hi folks,
>
> I have been introduced to a project where I have to implement a TFT display
> controlller on a low-cost FPGA like Spartan-3 or Spartan-6. The controller
> has to support at least XGA - 1024x768, SXGA - 1280x1024, UXGA - 1600x1200
> and WUXGA 1920x1200. I have to chose an appropriate platform now. As I am a
> total newbie in the field of image processing on FPGAs I would ask you for
> your recommendation about size and type of FPGA, especially in terms of
> logic for video scaling and SRAM memories for frame buffer storage.
>
> Many thanks in advance.
>
> KR, Maurice

Depending on how much processing you do, you might find that you're
actually limited in choice by the number of I/O's you need rather
than the fabric capacity of the part. The family choice probably
depends on your interface speed. If you need Panel-Link at high
data rates, for example you probably want to look at newer parts.
Most video designs use SDRAM for frame buffer, as there is no
speed penalty when the bulk of your access is sequential, and
latency is almost never an issue. DDR2 works well without all
the external terminating components or Vtt supply if you can
use just one or two parts and keep the routes down around an
inch. For scaling it's best to pick a family with built-in
multipliers, but again since latency is usually not an issue,
you could build multipliers from the fabric as long as you
pipeline them enough to run at speed. The number of multipliers
depends to some extent on the maximum scaling ratio, because
you'll need to build better filters for higher scaling ratios
(more taps). At small scaling ratios, like 1.2:1 for example,
you can probably ditch the filters and just use interpolation.
HTH,
Gabor
From: rickman on 5 Mar 2010 12:56
On Mar 5, 10:00 am, "Maurice Branson" <trauben...(a)arcor.de> wrote:
> Hi folks,
>
> I have been introduced to a project where I have to implement a TFT display
> controlller on a low-cost FPGA like Spartan-3 or Spartan-6. The controller
> has to support at least XGA - 1024x768, SXGA - 1280x1024, UXGA - 1600x1200
> and WUXGA 1920x1200. I have to chose an appropriate platform now. As I am a
> total newbie in the field of image processing on FPGAs I would ask you for
> your recommendation about size and type of FPGA, especially in terms of
> logic for video scaling and SRAM memories for frame buffer storage.
>
> Many thanks in advance.
>
> KR, Maurice

Build your controller design and measure the size to pick the part you
need. Anything else is speculation without a clear understanding of
the design.

BTW, a display controller is not "image processing". It is just a
display controller. If you need to do image processing, you need to
describe that in detail to include in your size estimate.

Rick
From: Raymund Hofmann on 5 Mar 2010 18:06
On 5 Mrz., 16:00, "Maurice Branson" <trauben...(a)arcor.de> wrote:
> I have been introduced to a project where I have to implement a TFT display
> controlller on a low-cost FPGA like Spartan-3 or Spartan-6. The controller
> has to support at least XGA - 1024x768, SXGA - 1280x1024, UXGA - 1600x1200
> and WUXGA 1920x1200. I have to chose an appropriate platform now. As I am a
> total newbie in the field of image processing on FPGAs I would ask you for
> your recommendation about size and type of FPGA, especially in terms of
> logic for video scaling and SRAM memories for frame buffer storage.

From my pesonal experience of porting my display contol / scaler ASIC
to a FPGA i would recommend Lattice ECP2/3. I think their timing
Performance is significantly better than Spartan 3 making it not too
difficult to achieve the timing you need for what you say.
But it looks like all this could keep you busy for a few years as a
"total newbie".
From: John Adair on 6 Mar 2010 10:06
The starting point for this is storage for data and the bandwidth to
access it. For those reasons I would suggest our Drigmorn3 as a
starting point with 1Gbit of DDR3. The advantage of the DDR3 is
density and speed.

For the manipulation there will be a big difference between possible
control/processing engines and it is difficult to be accurate of what
size is best. The LX16 on the Drigmorn3 is a reasonable size but if
you think that is not enough there will be another product shortly
with a bigger part.

John Adair
Enterpoint Ltd. - Home of Merrick1. The HPC Solutions.


On 5 Mar, 15:00, "Maurice Branson" <trauben...(a)arcor.de> wrote:
> Hi folks,
>
> I have been introduced to a project where I have to implement a TFT display
> controlller on a low-cost FPGA like Spartan-3 or Spartan-6. The controller
> has to support at least XGA - 1024x768, SXGA - 1280x1024, UXGA - 1600x1200
> and WUXGA 1920x1200. I have to chose an appropriate platform now. As I am a
> total newbie in the field of image processing on FPGAs I would ask you for
> your recommendation about size and type of FPGA, especially in terms of
> logic for video scaling and SRAM memories for frame buffer storage.
>
> Many thanks in advance.
>
> KR, Maurice

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