AnsweredAssumed Answered

i.MX6UL DDR3L Calibration Values

Question asked by Michael Perreca on Jan 3, 2017
Latest reply on Jan 5, 2017 by gusarambula

Good Afternoon,

 

I recently received my first prototype boards which have the i.MX6UL and 512MB of DDR3L memory.

 

I'm run the DDR calibration using DDR Test Tool 2.6 with no issues. What I am seeing is variation in the calibration board to board.  Here are the values for all 16 boards:

 

Unit0x021b080c0x021b083c0x021b08480x021b0850
10x000000000x014C014C0x404042480x40405450
20x000000000x014801480x4040444A0x4040544E
30x000000000x014801480x4040424A0x4040544E
40x000000000x014401480x4040424A0x40405650
50x000000000x015401500x4040464E0x4040544E
60x000000000x014C01540x4040464A0x40405452
70x000000000x015001500x4040464A0x4040544E
80x000000000x014C014C0x4040444E0x4040544E
90x000000000x014C014C0x4040444C0x40405650
100x000000000x0150014C0x404046480x4040544C
110x000000000x014C01500x4040464C0x4040544E
120x000000000x014C01500x4040464C0x4040564E
130x000000000x015801540x4040464A0x4040564E
140x000000000x015401540x4040464E0x4040564E
150x000000000x014801400x404042440x4040524E
160x000000000x015001500x4040464C0x40405650

 

My questions are as follows:

 

1.  Why is there such variation between the boards?

2.  How should I go about selecting the proper value for production settings with these variations?

3.  There is obvious concerns over temperature that these settings are not proper, how should I account for temperature?

 

Thanks!

 

-Mike

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