I have a custom design with a imx6dl, combined with 4 * 2Gbit DDR3 ram
Samsung K4B2G1646F-BCK0, running as DDR3-800.
I generated timings
* using the I.MX6DQSDL DDR3 Script Aid V0.10 document
* reading data sheets & calculating the register contents (attached)
I've been trying to obtain additional settings with the DDR_Tester application. (ddr_stress_tester_v2.60)
However, the tool always ends with the following issue.
Starting DQS gating calibration
*** snip ***
ERROR FOUND, we can't get suitable value !!!!
dram test fails for all values.
Error: failed during ddr calibration
It seems that the first part (Write level HW calibration) runs fine.
I've search the forum, and I noticed that there are others with similar problems.
I've tried several things (like increasing WALAT), but without any results.
I also tried several boards, all of them have the same problem.
Any idea what could be wrong? Is one of my settings wrong? Hardware failure?
Anything that I can try next?
Original Attachment has been moved to: ddr3.txt.zip
Original Attachment has been moved to: MX6DL_samsung_ddr3.inc.zip