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DS64BR111 / link up for SAS/SATA

Toshiyuki
Mastermind 7075 points
Other Parts Discussed in Thread: DS64BR111

Hi,

In hot-swap,how would the device link up for SAS/SATA?

Please let me know if there is any difference for MODE pin setting.

Best Regards,

Kato

  • 0
    TI__Expert 3175 points

    Hi Kato,

    We are looking into this case.Someone will respond soon.

    regards,

    TK Chin

  • 0
    TI__Mastermind 29655 points

    Hi Kato-san,

    In hot-swap, the end processors will need to reinitialize the link by resetting the PHYs and performing link training. The DS64BR111 will simply pass data through with the repeater's programmed EQ, DEM, and VOD settings. Ultimately, the controller/expander and target drive are responsible for establishing link connectivity.

    The difference in the MODE pin setting is relevant to passing OOB signals. These OOB signals establish the link training process of the line, because they determine the maximum operating data-rate up to 6G. If you are using the device for SAS/SATA, it is important to set MODE = 0  to ensure that the DS64BR111 passes OOB signals directly.

    Thanks,

    Michael

  • 0 in reply to Michael Lu (Santa Clara)
    Mastermind 7075 points

    Michael - san,

    Thank you for the reply.

    I have additional questions about slow OOB and fast OOB mode.

    Please let me know how fast each mode is.

    In addition,what is the difference between eSATA mode and SAS mode?

    Best Regards,

    Kato

  • 0 in reply to Toshiyuki
    TI__Mastermind 29655 points

    Hi Kato-san,

    Slow OOB gives a response of ~150 ns for assert/de-assert.

    Fast OOB gives a response of ~4 ns for assert/de-assert.

    eSATA mode is like a low-power SATA version, where power to the channels is cut when no input signal is sensed for a long time (typically ~100 us). In low power mode, sending a signal into the device channel will turn the channel back on, and the device will work normally again once fully powered. In most applications for this part, SAS/SATA mode is used more often than eSATA.

    Thanks,

    Michael