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External RAM

Livio Franchin
Intellectual 835 points


In our project we need to use an external static ram to store data in safety mode. (about 2Mbytes) Reading the safety manual of TMS570 I found that is not possible to use the external memory interface (EMIF) for safety application because it is  not a safety critical device component. How can to connect an external static ram in accordance with the requirements of IEC 61508 ??

  • 0
    TI__Mastermind 22375 points

    Livio,

     

    I've contacted our safety expert to have a look to your question.

    I will let you know as soon as I have a reply.

     

    Thanks and Regards,

    Jean-Marc

  • 0
    TI__Mastermind 23000 points

    Hello Livio,

    When originally designed, the TMS570LS2x product was intended to use the SRAM as a flash replacement memory with the POM.  The majority of use cases from customers disable the EMIF logic and do not use for safety critical purposes, which is what we have reflected in our safety manual.  It is certainly possible to implement a safety function using the EMIF, but there are no built in safety mechanisms for this logic.  Any safing that you do will need to be done in your software or system.  Standard information redundancy techniques could be used, such as periodic checksums of static memory contents, multiple read of desired data, read back of written data, etc.

    Regards,

    Karl