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GPMC timing with 40pF load

Laurent Dawance
Prodigy 60 points
Other Parts Discussed in Thread: AM3703

Hi,

Timings in datasheet are assuming 12pF load.

Is it possible to estimate impact on timing on muxed A/D bus with 40pF load?

BR, Laurent.

  • 0
    TI__Guru 62835 points

    It would be helpful if you specified which device you are asking about in the text of the post.  The title of this forum is "AM35x, AM37x Sitara ARM Processors Forum", but the forum description does not mention AM37x.  Therefore, I was not sure which device you were asking about.

    After reviewing both AM35x and AM37x data sheets it appears you are asking about AM37x since it only defines a GPMC output loading condition of 12pF. 

    I will ask around tomorrow, but I assume we only have timing data for the condition shown in the data sheet.

    Regards,
    Paul

  • 0 in reply to peaves
    Prodigy 60 points

    Hi Paul,

    We are using an AM3703 and indeed datasheet is providing timing for 12pF load.

    In same context, do we have some settings for GPMC IO's, like driving strength?

    BR, Laurent.

  • 0 in reply to Laurent Dawance
    TI__Guru 62835 points

    I searched the AM37xx TRM and found some bits in the CONTROL_PROG_IO0 register that controls the GPMC IOs.  Our GPMC expert told me timing closure was done with default register settings.  So the GPMC timing parameters published in the data sheet assume these register bits are configured to their default value.

    Regards,
    Paul