i.MX ProcessorsのトピックRe: Difference between cold and warm reset

Difference between cold and warm reset

ko-hey — Tue, 25 Nov 2014 07:43:06 GMT

Hi all I can't understand between cold and warm reset. In reference manual P5062, there is a table that is shown SRC reset functionality. However, there are no difference between cold and warm reset. http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf What is the difference between cold and warm reset? Best Regards,

Re: Difference between cold and warm reset

igorpadykov — Tue, 25 Nov 2014 08:18:56 GMT

Hi ko-hey

difference is dscribed in sect.60.6.1.2.4 COLD RESET

60.6.1.2.5 WARM RESET IMX6DQRM

Probably main difference is that during warm reset MMDC

can put DDR in self refresh.

Best regards

igor

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Re: Difference between cold and warm reset

ko-hey — Tue, 25 Nov 2014 09:09:51 GMT

Hi Igor

Thank you for your replay.

However, it's not about sequence. I want to know about functionally difference.

Here is my understandings. Are these correct?

POR will erase all data including each register value
COLD reset will erase all data except each register value
WARM reset will do self-refresh to DDR

Best Regards,

Re: Difference between cold and warm reset

igorpadykov — Tue, 25 Nov 2014 09:26:42 GMT

Hi ko-hey

I am not sure that such complex subject may be explained

in such simple manner. Please look carefully documentation

in particular Table 60-4. SRC reset functionality IMX6DQRM

~igor

Re: Difference between cold and warm reset

ko-hey — Tue, 25 Nov 2014 09:42:36 GMT

Hi Igor

I apologized it. I think it is just as you say.

So let me talk about Table 60-4.

In Table 60-4, it looks no functionally difference between COLD and WARM reset.

What's the difference between COLD and WARM reset?

Is the main difference only self refresh?

Best Regards,

ko-hey

Re: Difference between cold and warm reset

igorpadykov — Tue, 25 Nov 2014 09:49:45 GMT

Actually there is always alternative: provide short and not

accurate answer and provide long and accurate. I would choose last. :smileyhappy:

Re: Difference between cold and warm reset

ko-hey — Tue, 25 Nov 2014 10:02:57 GMT

Igor

I understood that WARM reset is similar to CLOD reset except to MMDC.

Thanks

ko-hey