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BQi's avatar
BQi
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

收发器接收pin作为收发器的参考钟

1SM21BEU2F55E2VG，quartus pro 19.3 根据收发器的user guide说明，GXT的数据管脚可以作为别的收发器的参考钟 我们的需求是这样，在一个 H tile中，24个收发器，8个输入参考钟 现在8个输入参考钟已经都占用了，还需要额外的4个参考钟，根据手册看到GXT的RX Pin0.. RX Pin 5可以作为输入参考钟，但是我们编译的时候 发现编译无法通过
Deshi_Intel's avatar
Deshi_Intel
Icon for Regular Contributor rankRegular Contributor
6 years ago

HI,

Thanks for sharing customer design and I understand the issue better now.

By right fPLL should be able to accept refclk pin from another Rx pin but customer design will failed fitter compilation unless dedicated refclk pin is used as fPLL refclk pin.

Let me build simple example design to verify fPLL refclk connection then I will get back to you.

Another feedback to your customer is your customer tend to use "generate" function to duplicate transceiver channel count instead of setting the right transceiver channel count in NativePHY IP

  • Pls advise your customer not to do it as it's very dangerous.
  • It's easily prone to user design connection error and may also mess up NativePHY internal connection generation.

Thanks.

Regards,

dlim