Hi Eric,
On 01/28/2015 12:59 AM, Eric Bénard wrote:
Hi Nikolay,
Le Wed, 28 Jan 2015 00:35:30 +0200,
Nikolay Dimitrov <[email protected]> a écrit :
On 01/27/2015 10:51 PM, Eric Bénard wrote:
Hi Nikolay,
Le Tue, 27 Jan 2015 22:23:15 +0200,
Nikolay Dimitrov <[email protected]> a écrit :
On 01/27/2015 07:40 PM, Gonzalez, Alex wrote:
Nikolay,
Assuming this is a custom board, if you are using different memory or with a
different configuration from the reference designs, you may need to change the
memory calibration to suit the hardware. Freescale support can provide an
application note that explains how to perform the calibration over a
representative sample of boards.
Yes, this is a custom board. I've already did the DDR3 calibration for
this design and validated it with 48h testing with the Freescale DDR
stress test tool (available on the IMX Community site).
are you sure of the stability of your power supplies under loard (not
only the memories' one) ?
Hmm, very good question. I haven't attached a scope to the voltage
rails, but that can be done easily. What would you advice for
considering as an acceptable voltage noise amplitude on the CPU rails?
as small as possible and no spikes under load with probe as close as
possible to the CPU and good GND reference.
Thanks for the remark. It turned out that the board indeed had high
power supply noise, which was causing this instability.
Regards,
Nikolay
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