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AM389x SATA AC coupling capacitors placement

Mihir K Patel
Prodigy 150 points
Other Parts Discussed in Thread: AM3894

Hi,

I am using SATA Interface with AM3894 processor. I have used AC coupling capacitors on TX and RX lines. Where should I place these capacitors to achieve the best performance? Shall I place them near AM3894 processor or near SATA connectors?

Thanks in advance.

Mihir K Patel

  • 0
    TI__Guru**** 170625 points

    Hi Mihir,

    I checked the AM3894 device datasheet, and I think the SATA capacitors should be placed near AM3894 processor. See below:

    http://www.ti.com/lit/ds/sprs681e/sprs681e.pdf

    8.17.1.1 SATA Interface Schematic

    Other useful link:

    http://processors.wiki.ti.com/index.php/AM389x_C6A816x_DM816x_Hardware_Design_Guide

    You can check also how the SATA is designed in the DM816X/AM389X EVM: http://support.spectrumdigital.com/boards/evm816x/revg/ -> C6A816x/AM389x EVM Board schematics.

    BR,

    Pavel

  • 0 in reply to Pavel Botev
    Prodigy 150 points

    Hi Pavel,

    1. Datasheet does not specify anything related to placement of AC coupling capacitors. It just shows the connection to be followed.

    2. I have checked in EVM. SATA AC coupling capacitors are placed near SATA connector.

    Regards,

    Mihir K Patel