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AM3517 DDR2 Cycle time

Prad
Expert 1125 points
Other Parts Discussed in Thread: AM3517

Hi,

 

What is the meaning of "333-DDR2 (supported for 216-MHz device)"

mentioned in the "Table 6-13" of AM3517's datasheet,

Can anybody guide me, how to understand "Table 6-13".

 

Thankyou in advance.

  • 0
    TI__Mastermind 41665 points

    I am not 100% certain yet, but I think this may be a bug in the AM3517 datasheet, particularly since the '216-MHz device' portion does not really make sense on a device that has only a 500MHz speed grade. If you look at some other TI processor datasheets that use DDR2 often the speed of the DDR2 interface is relative to the speed grade of the part (faster grade devices can handle faster DDR2 bus speeds), so I think this may be a documentation bug brought on by bringing in documentation from some other part without properly cleaning it up for the AM3517. I will file this as a documentation bug, if I hear anything differently back on this I will update this thread, I suspect this will be fixed in a future revision of the datasheet (note that the current datasheet revision is still in a 'product preview' state).

  • 0 in reply to Bernie Thompson TI
    TI__Genius 9190 points

    This is a type-o.  The Max clock frequency for the DDR2 interface is 166MHz for the AM35x devices. 

  • 0 in reply to Jeff Culverhouse
    Expert 1125 points

    Hi Jeff,

     

    Thankyou,

    But AM3517's EVM seems to be uisng 333MHz DDR2 "MT47H64M16HR-3",

    could u please send me the complete table "Table 6-13".

     

    Regards.

  • 0 in reply to Prad
    TI__Genius 9190 points

    Hi Prad,

    That table will be removed from the DM.  The Memory used on the AM3517 EVM is a 333DDR2 which has a max frequency of 166MHz.  The 333 is the Data Rate, not the Frequency.  That is why we have the 333 on the EVM.  Basically the AM35x supports up to 333-DDR2 (166MHz) devices. 

    The table that was in there accidentally got copied from a different device which had multiple operating points/frequencies (OPP). 

    Sorry for the confusion.

    Best regards,
    Jeff

  • 0 in reply to Jeff Culverhouse
    Prodigy 170 points

    Hi Jeff,

    Is there any roadmap to speed up the DDR2 interface for any AM351X parts?  This is becoming a design bottleneck but, otherwise, the part is a good fit!

    What limits the maximum DDR2 speed (I can limit the temperature range, tighten the voltage supply margins and improve signal path / terminations if that would help)?

     

    Best regards,

     

    Charlie