Problem for the MT48LC16M16A2-7E replaces MT48LC16M16A2-75

Discussion around AT91RM9200 and SAM9 Series Products.

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zouxpxp
Posts: 3
Joined: Wed Apr 06, 2011 5:01 am

Problem for the MT48LC16M16A2-7E replaces MT48LC16M16A2-75

Sun Sep 28, 2014 3:51 am

Hi team,

We use MT48LC16M16A2-7E replace MT48LC16M16A2-75,can you help me modify timing sequence?
Borad CPU : AT91SAM9G20;CPU MCK: 133MHZ;



I modified the procedure is as follows:



WRITE(AT91C_BASE_SDRAMC, SDRAMC_CR, AT91C_SDRAMC_NC_9
> | AT91C_SDRAMC_NR_13
> | AT91C_SDRAMC_CAS_2
> | AT91C_SDRAMC_NB_4_BANKS
> | sdrc_dbw
| AT91C_SDRAMC_TWR_2
> | AT91C_SDRAMC_TRC_9
> | AT91C_SDRAMC_TRP_2
> | AT91C_SDRAMC_TRCD_2
> | AT91C_SDRAMC_TRAS_6
> | AT91C_SDRAMC_TXSR_10);

But System is not working properly, I could not find the problem.can you help me ??


Wait for the good new;


zouxueping
mkarls
Posts: 1
Joined: Thu Jan 08, 2015 5:05 pm

Re: Problem for the MT48LC16M16A2-7E replaces MT48LC16M16A2-

Thu Jan 08, 2015 5:14 pm

Which type of problem do you exactly have resp. was you able to solve? We migrated from an obsolete ELITE SDRAM to new replacement type some month ago. But sometimes the SDRAM access are not working properly. This leads to exceptions.

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