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AM3352: GPMC burst write CSWROFFTIME

Kummi
Mastermind 6220 points

Part Number: AM3352

Hi,

I have provided a Documentation Feedback already but wanted to
make sure if our understanding is correct.

In case of Burst Read,
the TRM "Figure 7-19. Synchronous Multiple (Burst) Read"
mentions that the CSRdOffTime (Read) doesn't include PageBurstAccessTime.
CSRDOFFTIME = CSRDOFFTIME0 + CSRDOFFTIME1




Whereas in case of Burst Write,
"Figure 7-22. Synchronous Multiple Write (Burst Write)"
mentions that the CsWrOffTime (Write) includes PageBurstAccessTime.
which makes it very become very longer compared to the CSRdOffTime(Read).





We believe the CsWrOffTime mentioned in the illustrative Figure 7-22
is wrong and it should be shorter similar to the CSRdOffTime (Read) without PageBurstAccessTime?

Best Regards
Kummi

  • 0
    TI__Guru**** 393215 points
    Hi,

    You already have a thread opened on the same subject: e2e.ti.com/.../594702
    Please do not double-post on this forum. Feedback will be provided on the original thread as soon as it's available. This current thread will be closed now.
  • 0 in reply to Biser Gatchev-XID
    Mastermind 6220 points
    Hi Biser,

    Thank you.
    I am sorry for posting the similar question.

    But, there are two questions on that post
    so i posted here to avoid the confusion.

    Best Regards
  • 0 in reply to Kummi
    Mastermind 6220 points
    Hi Biser,

    Can we re-open this post?
    As you see the above post is a different topic on datasheet's Setup/Hold time and
    this question is bit different about error in the TRM Figure.

    Best Regards
    Kummi
  • 0 in reply to Kummi
    TI__Guru* 95741 points
    Kummi, do you have any evidence that the diagram is incorrect? I think you may have a good point, because the control signals get extended during burst accesses, so the CSWROFFTIME should be calculated in a similar manner as CSRDOFFTIME, as you point out.

    Unfortunately, I do not have time to check this out on a board in the near term. Did your customer observe this on a board? Or is it just a guess based on how the read CS time is calculated?

    Regards,
    James
  • 0 in reply to JJD
    Mastermind 6220 points

    Hi James,

    Thank you very much.

    Actually we don't have the evidence as such,
    the customer is currently designing their board.

    This assumption is based on the CS Read time.
    And the definitions or the equations in the manual are same for both
    CS Read time as well as write time.
    So we assume this Figure 7-22 is incorrect.

    Best Regards
    Kummi