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DS320PR1601: redriver

SHEKHA SHOUKATH
Intellectual 520 points
Part Number: DS320PR1601

Tool/software:

Hi,

how is power down pins related to the working of Redriver.

if the endpoint is a ssd, does it mean pd =low means ssd detected at root port?

how is perst and prsnt signal related to pd pins?

Thanks and Regards,

Shekha Shoukath

  • 0
    TI__Intellectual 2175 points

    Hi Shekha,

    1.  The power down pins determine the functional mode that the redriver is configured to. For example, in Active PCIe Mode, the power down (PD) pins are driven to LOW in a system for normal operation. By setting the PD pins to high, the Standby Mode is invoked, which shuts down device channels into a reset state to conserve power.  

    2.  If the PD pins are toggled to LOW, this would invoke normal redriver operation. However, this would not indicate that an SSD was detected at the root port. If you control the PD pins by PRSNT#, the device will be in reset state if your endpoint SSD is removed and will properly restart Rx detection once the SSD is inserted again.

    3. These signals are the recommended method to set the PD pins to high or low to configure the functional mode of the redriver. By controlling the PD pins by PERST#, the device will only begin Rx detection once system PERST# is de-asserted. Connection of PD pins to the system PRSNT# signal would ensure that the endpoint has been properly inserted before beginning Rx detection when toggling between functional modes.

    Best,

    Greg