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TMS320F28388D: EMIF RAS and CAS signal names

Samuel NK
Prodigy 30 points

Part Number: TMS320F28388D

Dear forum users,

It seems from the TRM that the RAS and CAS MCU outputs are not inverted, however when looking e.g. at the F2837xD controlCARD and the F28379D_EMIF_DC_SCH (where the SDRAM expects inverted inputs) the signals are directly connected to the memory. Hence might there be a naming issue (lacking the "roof" above the signal names)?

BR
Samuel

  • 0
    TI__Mastermind 30185 points

    Hello Samuel,

    I see that in the EMIF Pins Specific to SDRAM table it mentions the CAS/RAS signals as active low an in the daughter card schematic/EMIF Functional Block Diagram this is not indicated. I will check with some other experts to verify the implementation of this and see if these need to be corrected.

  • 0 in reply to Omer Amir
    TI__Mastermind 30185 points

    Hello Samuel,

    In the F28379D_EMIF_DC_SCH diagram the active-low signal is indicated by a '#':

    For the difference in the EMIF Functional Block Diagram, I believe this may be a typo. I will make this fix for the next revision of the reference manual, or let you know if I find out otherwise.

  • 0 in reply to Omer Amir
    Prodigy 30 points

    Hello Omer,

    Thank you for your reply. I meanwhile also tested an old design of ours with F2837xD RAS & CAS MCU output assumed active low, and it works. Based on this, on the similarity of EMIF modules, and on your typo assumption, we go forward in our design accordingly.

    BR
    Samuel