7 Series FPGAs 의 GTX/GTH 를 사용하지 않을 경우, GTX/GTH 관련 Pin 들은 어떻게 처리하여야 하나요?

7 Series FPGAs 의 GTX/GTH 를 사용하지 않을 경우, GTX/GTH 관련 Pin 들은 어떻게 처리하여야 하나요?



"7 Series FPGAs 를 사용할 경우 GTX/GTH 를 사용하지 않을 경우에 GTX/GTH 관련 Pin 들을 어떻게 하여야 하나요?" 라는 개발자분들이 문의를 많이 받습니다.




##1

먼저 7 Series FPGAs 의 GTX/GTH 관련 Guide 문서를 보아야 해요.
아래 링크는 7 Series FPGAs GTX/GTH User Guide 문서랍니다.

UG476 (v1.12) - 7 Series FPGAs GTX/GTH Transceivers User Guide


위 문서의 316 페이지의 Table 5-7: GTX/GTH PCB Design Checklist 를 자~알 살펴보면 사용하지 않을 경우에 어떻게 하는지에 대한 각 Pin 별 설명이 있어요.


Table 7-5: GTX/GTH PCB Design Checklist



##2

Table 7-5: GTH PCB Design Checklist 에서 GTX/GTH 를 사용하지 않을 경우에 어떻게 하는지에 대한 설명을 정리하면 다음과 같아요.


  1. MGTREFCLK0P, MGTREFCLK0N
    • If reference clock input is not used, leave the associated pin pair unconnected.
  2. MGTREFCLK1P, MGTREFCLK1N
    • If reference clock input is not used, leave the associated pin pair unconnected.
  3. MGTRXP0/MGTRXN0
    • If a receiver is not used and not biased, connect the associated pin pair to ground. If the receiver is not used but biased, leave the pin pair unconnected.
  4. MGTRXP1/MGTRXN1
    • If a receiver is not used and not biased, connect the associated pin pair to ground. If the receiver is not used but biased, leave the pin pair unconnected.
  5. MGTRXP2/MGTRXN2
    • If a receiver is not used and not biased, connect the associated pin pair to ground. If the receiver is not used but biased, leave the pin pair unconnected.
  6. MGTRXP3/MGTRXN3
    • If a receiver is not used and not biased, connect the associated pin pair to ground. If the receiver is not used but biased, leave the pin pair unconnected.
  7. MGTTXP0/MGTTXN0
    • If a transmitter is not used, leave the associated pin pair unconnected.
  8. MGTTXP1/MGTTXN1
    • If a transmitter is not used, leave the associated pin pair unconnected.
  9. MGTTXP2/MGTTXN2
    • If a transmitter is not used, leave the associated pin pair unconnected.
  10. MGTTXP3/MGTTXN3
    • If a transmitter is not used, leave the associated pin pair unconnected.
  11. MGTAVTT
    • If all of the Quads in a power supply group are not used, the associated power pins can be left unconnected or tied to ground (unless the RCAL circuit is in that Quad).
  12. MGTAVCC
    • If all of the Quads in a power supply group are not used, the associated power pins can be left unconnected or tied to ground (unless the RCAL circuit is in that Quad).
  13. MGTVCCAUX
    • If all of the Quads in a power supply group are not used, the associated pins can be left unconnected or tied to ground (unless the RCAL circuit is in that Quad).
  14. MGTRREF
    • If all of the Quads are not used, connect the associated pin pair to ground.
  15. MGTAVTTRCAL
    • If all of the Quads are not used, connect the associated pin pair to ground.


여러분의 FPGA 설계에 도움이 되었길 바랍니다.

그럼, 오늘도 좋은 하루 되세요.



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