This was a very good beginner's presentation to the PCI Express Physical Layer. This presentation has now given me the confidence to do some deep diving by checking additional literature on PCI Express. Thank you very much.
Thanks so much... So the Receiver does clock and data recovery on its Receiver block side from its Rx stream. What about PCIe Clock reference? Is it sync in both Driver and Receiver? OR separated ref clock on each side?
A PCIe device can choose to use the reference clock or it can provide its own. If it provides its own it has to be within the +/- spec (off the top of my head +/- 300 PPM). I suppose both TX and RX sides use the reference clock but I also suppose this is implementation specific!
Very Good Presentation on PHY Layer for PCIe and learnt new things from your session Sir and requesting you that giving session on Transaction Layer and Data Link Layer also.
I was hoping you might explain how 128b/130b encoding could possibly maintain DC balance with disparity. Perhaps I am misunderstanding it but it seems that with 2 bit periods to compensate, it couldn't. I have the same question how all zeros could even be DC balanced with 8b/10b.
Doesn't scrambling also help with DC balance and to ensure sufficient transition for clock and data recovery (in addition to 8b/10b) ? Is scrambling AND b8/10b used at the same time? In the FPGA based example, where is the scrambling done?
No, scrambling is used to spread out the frequency content in the signal, which lowers electromagnetic interference (EMI). 8b/10b encoding is used to embed the clock in the signal and to provide DC balance. They are normally used both at the same time but the scrambling can actually be disabled. Scrambling is also not enabled for the PCIe compliance pattern (which does use 8b/10b encoding).
This was a very good beginner's presentation to the PCI Express Physical Layer. This presentation has now given me the confidence to do some deep diving by checking additional literature on PCI Express. Thank you very much.
John, this is an explanatory explanation! By watching this saves me a lot of time!!
Correction: 27:51, 400ps/bit Not 400ns.
Video ends at about 44:15. After that its just a black screen until the end of the video.
Really enjoyed his presentation style which helped me to understand each concept well. Thank you!
it's almost midnight on a Friday, and I'm learning about the physical layer technology of PCIe....
Doo Doo
Doo Doo
Doo Doo
Doo Doo Doo
Doo Doo
I hope you enjoy my rendition of your theme song.
can you provide the links to the video for Pcie communication packets
That is an eye opening experience. Thanks for the video!
At 27:50, it should be 400ps per bit instead of 400ns per bit.
Very clear presentation! Thank you so much!
Really great video, thank you so much for the wonderful content!
Can anyone tell me how long is tens of inches stated at 22:30?
Great presentation. Thank you!
Hi, That was an excellent video. Hope you release more and more such videos in the future
Thanks so much... So the Receiver does clock and data recovery on its Receiver block side from its Rx stream. What about PCIe Clock reference? Is it sync in both Driver and Receiver? OR separated ref clock on each side?
A PCIe device can choose to use the reference clock or it can provide its own. If it provides its own it has to be within the +/- spec (off the top of my head +/- 300 PPM). I suppose both TX and RX sides use the reference clock but I also suppose this is implementation specific!
Beautiful.. Thanks for sharing this with the world
Very Good Presentation on PHY Layer for PCIe and learnt new things from your session Sir and requesting you that giving session on Transaction Layer and Data Link Layer also.
Such a great presentation. Thank you! Much appreciated.
I was hoping you might explain how 128b/130b encoding could possibly maintain DC balance with disparity. Perhaps I am misunderstanding it but it seems that with 2 bit periods to compensate, it couldn't. I have the same question how all zeros could even be DC balanced with 8b/10b.
Doo Doo
Doo Doo
Doo Doo
Doo Doo Doo
Doo Doo
I hope you enjoy my rendition of your theme song.
Very clear explanation of PCIe. Thanks.
Excellent, please make more video.
Excellent Presentation! Thanks alot!
Doesn't scrambling also help with DC balance and to ensure sufficient transition for clock and data recovery (in addition to 8b/10b) ? Is scrambling AND b8/10b used at the same time? In the FPGA based example, where is the scrambling done?
No, scrambling is used to spread out the frequency content in the signal, which lowers electromagnetic interference (EMI). 8b/10b encoding is used to embed the clock in the signal and to provide DC balance. They are normally used both at the same time but the scrambling can actually be disabled. Scrambling is also not enabled for the PCIe compliance pattern (which does use 8b/10b encoding).
Thanks!
Right!! The 8b/10b dwords were made in such a way that the only valid combinations by which they can be sent are DC balanced (equal 1's and 0's).
what is the link for part 2 ?
Great training video.
Are you planning to cover other PCIe layers in same way?
Thanks a lot.. It really very informative.. But have a doubt about usage of SKP data characters.. Can any one give some brief about there usage??
Very informative, thanks for sharing.
Awesome learn a lot from you!
42k views in 3 1/2 years. My faith in geekmanity is restored.
Is there a link to the presentation ?
Thank you that was really helpful
bookmark 31:25
Great stuff
Will watch again..maybe at 1.25 speed. I don't mean that in anyway but that I want to catch up.
Thank you.
like it. Thank you
do a video about QPI 🥲