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davidday47

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  1.    JColvin reacted to an answer to a question: Digital Discovery logic waveforms very glitchy
  2. davidday47
    Hi JColvin, I made some twisted pairs as shown on Digilent site and glitches are gone. Best regards, David
  3. davidday47
    Hi JColvin, Ordered the Digilent twisted pairs per link, will arrive in 3-5 business days. Looking forward to eliminate those glitches. Thank you guys for the expertise. Best regards, David
  4. davidday47
    Hi attilia, I have connected all GND leads but still noise, so crosstalk is most like cause. Do you know if Digilent sells compatible headers and twisted pairs? Or this one from digikey https://www.digikey.com/en/products/detail/pactech/PC-US2-EXT2-06-K/16396808 Best regards, David
  5. davidday47
    Hi JColvin, You are right, TXAOUT and TXBOUT are not the issue. The chip has 3 GND pins and connect to DD2 3 GND pins. Here is the bench set up, 800MHzx8. TXAOUT/TXBOUT unconnected, trigger on falling edge nCS. SI signal has a lot of glitches, sometimes TFEMPTY signal also glitched. I think more GND connections to the board will be better but not sure.
  6. davidday47
    Hi, Not sure why SPI signal SI that comes from a chip so glitchy. TFEMPTY that is a TTL logic output also glitchy. It seem TXAOUT and TXBOUT causing it, they are +5V/-5V signals. Not sure how to handle those +5V/-5V swing signals. Best regards David
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