topic Re: ECC RAM Error Injection on MPC5644A in MPC5xxx

ECC RAM Error Injection on MPC5644A

tunayan — Thu, 03 Dec 2015 08:56:10 GMT

Dear Community Users,

I am using mpc5644A EVB kit with CW 10.6

I have a problem with ECC Ram check. I tried to follow AN5200 application note but it was not work for me.

So basically i am doing below operation;

#define ECSM_ECR_ERNCR_MASK 0x02 // RAM Noncorrectable

//INIT

ECSM.ECR.R = (uint8_t)ECSM_ECR_ERNCR_MASK ; // non-correctable RAM ECC error

//FORCE TO GENERATE ERROR

ECSM.EEGR.R = (uint16_t)(ECSM_EEGR_FR1NCI_MASK | 1);

//GENERATE WRONG READ OP

test[0] = 0xCAFEBEEF;

//FOUND ECC ERROR

test_read = test[0];

In that line, i assume that ECSM.ESR.B.RNCE must be "1". But this register seems "0".

I am doing that operation with debug mode. Is it important? How can i inject a RAM error to system?

Thanks all.

davidtosenovjan — Wed, 09 Dec 2015 09:07:34 GMT

I must admit I have an error in my AN5200 Example 1 source code. I cannot imagine how it happened. Hoping it'll be corrected early in our public web.

Corrected example you may download here:

Following code line is incorrect

/* Force internal SRAM one non-correctable data error */
ECSM.EEGR.R = (uint16_t)(ECSM_EEGR_FR1NCI_MASK | 1);

and it should be as follows

/* Force internal SRAM one non-correctable data error */
ECSM.EEGR.R = (uint16_t)(ECSM_EEGR_FR1NCI_MASK | 32);

The root cause of this issue is that basically that Table 3 of AN5200 is valid for MPC5634M as well.

I am very sorry for my embarrassing fault.

davidtosenovjan — Tue, 15 Dec 2015 08:46:09 GMT

Just to inform you - Revision 1 of the document is now officially published and mentioned error is corrected in the Example 1.

tunayan — Tue, 15 Dec 2015 09:17:52 GMT

Problem is solved. You are right

Thank you.