Fast data transfer between omap3x and FPGA

NathanKr

Prodigy 180 points

we need to transfer data between omap3x and FPGA.

we have wince running over omap3x.

what is the best solution in terms of throuhput.

Nathan

over 14 years ago

0 Jatin Jain over 14 years ago

TI__Genius 9185 points

I think this is a hardware question (i.e, deciding what interface to use) and hence better suited for the OMAP35x processor forum. I will move it to the appropriate forum. Once you have decided on the interface then the OS driver aspect of it will become relevant and if you have WinCE specific question you can open a new thread in the WinCE forum.

It helps if you can provide more information about your requirement (what kind of throughput you are looking for etc).

0 Soren Steen Christensen over 14 years ago in reply to Jatin Jain

Genius 3685 points

Hi Nathan,

In terms of maximum throughput you should definitely go for using the GPMC bus. I seem to remember that I have had the GPMC giving an effective throughput of ~150MB using DMA and 16 bit synchronous burst mode some time back? Latest information from TI is however a maximum throughput of ~103MB/s. Please see the following thread: http://e2e.ti.com/support/dsp/omap_applications_processors/f/447/p/65177/238224.aspx#238224

In case lower performance is needed or fewer connections required, you could either simulate a MMC interface giving you a theoretical throughput (at ~10 wires) of up to ~48MB/s (practical might be around 5-10MB/s with the current drivers) or a SPI/I2S interface which could both would give you a theoretical throughput of up to ~6MB/s (at ~3-4 wires)

I hope this helps you forward?
Søren

0 NathanKr over 14 years ago in reply to Soren Steen Christensen

Prodigy 180 points

Hi Soren

yes, this does help.

Thank you.

Nathan

0 Brahim HAMADICHAREF over 13 years ago in reply to Soren Steen Christensen

Intellectual 485 points

All these numbers look great but how we (experimenters) learn to reach these data transfer rates ?

Any code from which we can learn ?

Brahim

0 Renjith Thomas over 13 years ago in reply to Brahim HAMADICHAREF

Guru 31670 points

Brahim,

What exactly are you looking for? Please share more details. I may be able to help you.

0 Brahim HAMADICHAREF over 13 years ago in reply to Renjith Thomas

Intellectual 485 points

Looking to learn how all these performance figures become code for us to

learn and also understand how to make use of the OMAP resources efficiently.

DMA should be used to liberate the ARM from data movement...

Brahim

0 Renjith Thomas over 13 years ago in reply to Brahim HAMADICHAREF

Guru 31670 points

Brahim,

There couple of methods to improve the performance. First one is definitely using DMA. The key thing is the timing settings. If the timings are not optimal, you will not be able to achieve best performance even using DMA. The depending on the device type, clocking will also become important.

If all of these parameters are configured for the best performance, you can get the max from the interface.

Processors

Processors forum

Fast data transfer between omap3x and FPGA