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DS160PT801: Interfacing with the new LMKDB1202

David Henderson
Prodigy 20 points
Part Number: DS160PT801
Other Parts Discussed in Thread: LMKDB1202

Hi,

Currently working on a design that integrates the DS160PT801 into a product.

I am looking at the clocking architecture for it. We will be running PCIe Gen4 through this and would like to be able to automatically work in CC or IR mode for clocking.

I had hoped to use the LMKDB1202 device as it appears to have a nice LOS feature where if the REFCLK from the PCIe backplane is not present then it can switch over to using an onboard oscillator.

I was hoping for some confirmation that these two devices are suitable to pair together for this function.

CLKIN0 -> PCIe REFCLK from Connector / Backplane

CLKIN1 -> 100MHz Differential Oscillator

CLKOUT0 -> PCIe Endpoint

CLKOUT1 -> DS160PT801 Input

LOS -> Latch Circuit -> CLK_IN_SEL

  • 0
    TI__Mastermind 18950 points

    Hi David,

    The LMKDB1202 is a new product so I'm unsure if it's been tested with the DS160PT801 before. As a basic reference clock input it should be very suitable, but I have some comments about the idea for automatically switching between common-clock and independent-reference modes. Since the details of the retimer operation are confidential, please accept my E2E friend request and I'll discuss with you in E2E direct messages.

    I've paged an expert from the Clocks and Timing product line to comment more on the LMKDB1202, if there are any special considerations unrelated to the retimer.

    Best,

    Evan Su

  • 0
    TI__Genius 10995 points

    Hello David,

    From the perspective of the LMKDB1202, the part can determine if an LOS event has occurred, but it cannot do the switching between inputs. Outside of the clarification, the LMKDB1202 seems like a suitable solution, but to echo Evan, we have not tested clocking the DS160PT801 with the LMKDB1202. Hope this helps!

    Good luck,

    Andrea