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AM6412: If PCIe refclk support LP-HCSL?

wei ye
Intellectual 410 points
Part Number: AM6412
Other Parts Discussed in Thread: LMKDB1102

Tool/software:

Hi,

AM6412 PCIe controller is Gen2 but it compliant with the electrical parameters specified in PCI Express® Base Specification Revision 4.0.

Could you please confirm if AM6412 PCIe clock support LP-HCSL input?

Regards,

Wei

  • 0
    TI__Intellectual 1445 points

    Hi Wei,

    what electrical parameters are you saying as not compliant and please describe more your schematic configuration.  It sounds like you are using a separate PCIe clock source that is an 100Mhz LP-HCSL driver as input into the AM6412.  Does you configuration have 50 ohm external terminations on each differential clock leg? 

  • 0 in reply to James Pair
    Intellectual 410 points

    Hi James,

    I prefer to use LMKDB1102 to generate PCIe refclk(LP-HCSL) for AM6412 and another PCIe device but the description on AM6412 datasheet make me confused.

    AM6412 has gen2 controller which should not support LP-HCSL but it is compliant with the electrical parameters specified in PCI Express® Base
    Specification Revision 4.0 which gen4 should support LP-HCSL.

    LP-HCSL and HCSL are not fully compatible.  

    Could you please help me to confirm if AM6412 PCIe refclk support LP-HCSL clock or not?

    Regards,

    Wei

  • 0 in reply to wei ye
    TI__Intellectual 1445 points

    if a clock driver is necessary for you then it should be HCSL.   I want to point out that AM6412 silicon Rev2 will support sourcing PCIe refclk

    Regards,

    James

  • +1 in reply to James Pair
    Intellectual 410 points

    Hi James,

    That's great.

    I double checked the Errata and found this issue(i2236) is not an issue anymore on silicon rev2.

    Thanks a lot.

    Regards,

    Wei