DDR3 Timings for BBG Wireless

Ryan

unread,

Sep 5, 2017, 3:54:48 PM9/5/17

to BeagleBoard

Hello,

I wanted to check if beagle bone green and green wireless use MT41K256M16TW-107 DDR chip?

If so, i am unable to find the ddr3 timings in the bootloader sources which makes me believe that i might be looking at some old code.

Can anyone point me to the right sources which contains ddr3 timings for MT41K256M16TW-107?

Thanks,

Robert Nelson

unread,

Sep 5, 2017, 5:16:08 PM9/5/17

to Beagle Board

For the am335x, u-boot uses some base jdec timings, then the rest is
auto-calibrated, all in "SPL"..

Regards,

--
Robert Nelson
https://rcn-ee.com/

Ryan

unread,

Sep 6, 2017, 6:05:25 AM9/6/17

to BeagleBoard

Hi Robert,

From my understanding, We need to input the timings to a Tool provided by TI and then it generates the values for each chip. This is different for different chips as timings are different.

I wanted to find out these timings. Also, I did not see anywhere AM335x will auto calibrate the values.

Can you please elaborate on them

Thanks

Jason Kridner

unread,

Sep 7, 2017, 12:41:59 AM9/7/17

to beagl...@googlegroups.com

On Wed, Sep 6, 2017 at 6:05 AM 'Ryan' via BeagleBoard <beagl...@googlegroups.com> wrote:

Hi Robert,

From my understanding, We need to input the timings to a Tool provided by TI and then it generates the values for each chip. This is different for different chips as timings are different.

I wanted to find out these timings. Also, I did not see anywhere AM335x will auto calibrate the values.
Can you please elaborate on them

Not 100% sure this is the magic code, but I suspect it is:

http://git.denx.de/?p=u-boot.git;a=commitdiff;h=fc46bae2ae38c8d0b1570427b5c9520281eaae4f

Thanks

On Wednesday, September 6, 2017 at 1:24:48 AM UTC+5:30, Ryan wrote:
Hello,

I wanted to check if beagle bone green and green wireless use MT41K256M16TW-107 DDR chip?

If so, i am unable to find the ddr3 timings in the bootloader sources which makes me believe that i might be looking at some old code.

Can anyone point me to the right sources which contains ddr3 timings for MT41K256M16TW-107?

Thanks,

--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups "BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/790347ca-8e90-4d96-94c6-a155f6a1e48f%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.