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66AK2Hx EMIF16 NOR Flash Boot Mode

-- David
Prodigy 90 points


How is the Base/Branch Address field of the EMIF16 boot mode used for a 16-bit data interface?   Do these bits map directly to the EMIF16 adress bus bits A[23:22]?   If so, does that mean that only the bit that maps to A[22] is relevant/used?

Thanks and Best Regards,

 --David 

  • 0
    TI__Guru* 81335 points
    David,

    I am working on this and will get back to you. Thank you for your patience.
  • 0 in reply to Raja
    TI__Guru* 81335 points

    EMIFA[23:22] behave as address selects.

    For 16-bit interface, EMIFA23 is connected to address pin A0 of the ASRAM/NOR Flash.

    For 8-bit interface, EMIFA[23:22] are connected to address pins A[1:0] of the ASRAM/NOR Flash

    In 16bit data interface A23 will never be used as the MSB of the address bus and will always be connected to A0 of a 16bit memory device or A1 of an 8bit memory device.

    Please refer below thread for more information.

  • 0 in reply to Raja
    Prodigy 90 points
    Hi Raja,

    Thank you for you reply. I had read the EMIF16 user guide and related e2e posts before posting my questions, so I think I understand the behavior of A[23:22]. I am not sure, however, how to interpret the EMIF16 boot mode Base Addr field in the DEVSTAT register as described in Table 8-8 EMIF Boot Device Configuration Field Descriptions of SPRS866E. Do they map directly to A[23:22} as figures 10-23 and 10-24 of SPRS866E seem to suggest? That is, does DESVSTAT[15] correspond to A[23] and DEVSTAT[14] correspond to A[22]? Since A[23] connects to A[0] of a 16-bit memory, does the value of DEVSTAT[15] get used for anything or is it a don't care bit?

    Best Regards,

    -- David
  • 0 in reply to -- David
    TI__Mastermind 43660 points
    Hello David,

    I believe the A[23:22] maps to the EMIF16 boot mode base address field DEVSTAT[15:14]. I do not see any EMIF related diagram in figures 10-23 and 10-24 of SPRS866E. Could you please point me to the correct reference to verify this.

    Regards,
    Senthil