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HBhat2's avatar
HBhat2
Icon for Contributor rankContributor
6 years ago
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Skew Calculations in native PHY for L-tile (Stratix 10)

Hi, I was estimating the clock skew between 2 channels of a transceivers bank. 3.9.4. Skew Calculations (as in L-tile transceiver user guide) Here, Maximum difference in number of parallel clo...
  • CheepinC_altera's avatar
    CheepinC_altera
    6 years ago

    Hi HPB,

    Sorry for the delay. I thought I have responded to your initial post but probably I have missed out to save into the system. Sorry for the inconvenience.

    Regarding the inquiry on the skew calculation, based on my understanding, the channel FIFO should be referring to the phase comp FIFO of the PCS. The reset that is affecting the FIFO is the tx_digitalreset. If your tx_digitalreset for all the bonded channels are de-asserted at the same time, the N can be 0.

    Please let me know if there is any concern. Thank you.

    Best regards,

    Chee Pin

CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
6 years ago

Hi HPB,

Just would like to follow up with you on this. Please let me know if there is any concern. Thank you.

Best regards,

Chee Pin

  • HBhat2's avatar
    HBhat2
    Icon for Contributor rankContributor
    6 years ago

    Hi Chee pin,

    I agree that tx_digitalreset affects the FIFO. I am thinking to de-select the " USE SEPERATE TX RESET per Channel" in the reset controller IP to make N=0. In this way single reset from reset controller can assert reset to both the channel PCS FIFOs.

    Note: I have to consider 2 ( adjacent ) channels while considering the skews in a bank.

    With Regards,

    HPB