topic Re: Way to dicide a tRPA parameter settings in i.MX Processors

Way to dicide a tRPA parameter settings

ko-hey — Tue, 26 Jan 2016 00:51:41 GMT

Hi all

How to decide a tRPA parameter in script aid ?

I'm setting a i.MX6SL's DDR3 parameters and using following script aid.

I can't find any description and data about tRPA in DDR3's datasheet and find only following description in i.MX6SL's reference manual.

But I can't understand which setting is suit for DDR3.

I also checked a DDR3 SDRAM Specification JESD79-3E (July 2010) but can't find any description about it.

I attached a DDR3's datasheet.

So could you point where it is in attached datasheet ?

Ko-hey

Re: Way to dicide a tRPA parameter settings

Yuri — Tue, 26 Jan 2016 03:56:55 GMT

Hello,

if the tRPA (PREA) is not provided in DRAM datasheet, one can

set it as tRP or tRP+1 for assurance.

Have a great day,
Yuri

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Re: Way to dicide a tRPA parameter settings

ko-hey — Tue, 26 Jan 2016 05:23:26 GMT

Hello Yuri

I understand as follow.

User can set it whichever user like if it not describe in datasheet.

User need test both of parameters, right ?

Ko-hey

Re: Way to dicide a tRPA parameter settings

Yuri — Tue, 26 Jan 2016 05:26:46 GMT

Yes, users can try both cases : tRPA = tRP and tRPA = tRP+1

~Yuri.

Re: Way to dicide a tRPA parameter settings

ko-hey — Tue, 26 Jan 2016 05:28:14 GMT

OK, thanks.

Ko-hey