i.MX ProcessorsのトピックRe: DDR Stress Tester

DDR Stress Tester

shojigoto — Thu, 29 Oct 2015 11:46:45 GMT

Is the DDR Stress Tester able to be available on the i.MX6Q without any boot program installed?

We are now facing a problem of DDR reset from i.MX6 being never deassetred after power-on, and

so the DDR stress Tester fails in executing DDR Calibration.

Regards,

Shoji

igorpadykov — Fri, 30 Oct 2015 02:07:42 GMT

Hi Shoji

one can use jtag version

also pin DRAM_RESET after power-up is low according to Table 100. 21 x 21

mm Functional Contact Assignments (continued) i.MX6DQ Datasheet (rev.4, 7/2015)

Best regards

igor

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shojigoto — Fri, 30 Oct 2015 06:43:08 GMT

Hi igor,

Thank you for your reply.

I found that a power line NVCC_LVDS_2P5 is left open on our board.

Could you tell me whether accessing to the DDR3 is possible in that case?

Regards,

Shoji

igorpadykov — Fri, 30 Oct 2015 10:41:52 GMT

Hi Shoji

from i.MX6DQ Datasheet (rev.4, 7/2015) Table 6. Operating Ranges :

This supply also powers the pre-drivers of the DDR I/O pins; therefore,

it must always be provided, even when LVDS is not used.

~igor