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BQ2022A: Redirection Bits

Alfred Logico
Expert 5060 points
Part Number: BQ2022A

Hi Team,

Good day! 

My customer is using the BQ2022A and is trying create their own program to program the EPROM memory when in production. THey mentioned that they are facing issues in using the redirection bits and what are the uses of these. Can anyone help?

Thanks! 

Best Regards,

Alfred Logico

  • 0
    TI__Mastermind 25955 points
    Hi Alfred,

    The page address redirection bytes are used to indicate to software if data on a page or page(s) is valid, and if not, where to locate the valid data.

    The hardware of the bq2022A makes no decisions based on the contents of the page address redirection bytes. This feature allows the user's software to make a data patch to the EPROM by indicating that a particular page or pages should be replaced with those indicated in the page address redirection bytes.

    The ones complement of the new page address is written into the page address redirection byte that corresponds to the original (replaced page). If a page address redirection byte has an FFh value, the data in the main memory that corresponds to that page are valid.

    If a page address redirection byte has some other hex value, the data in the page corresponding to that redirection byte are invalid, and the valid data can now be found at the ones complement of the page address indicated by the hexadecimal value stored in the associated page address direction byte.

    For more information, please refer to section 7.3.2 of the device datasheet, found here: www.ti.com/.../bq2022a.pdf

    Sincerely,
    Bryan Kahler