PCIE Tutorial: PCIE Three Layers and Ack/Nak Protocol

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PCIE Tutorial: PCIE Three Layers and Ack/Nak Protocol

 

In this episode, we talk about PCIE protocol, three layers, packet type and assembly, and packet tx/rx as well as data link layer error detection and TLP Retry Buffer. It is a premium tutorial. Our first tutorial, PCIE enumeration, in series is a public post.

PCI/PCIE protocol defines three layers, transaction layer, data link layer, and physical layer. As shown below, data from software are first packaged in transport layer by appending TLP header and TLP ECRC. ECRC stands for end-to-end CRC and is 32 bits.
pkt_retry1

 

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We are a small team of ASIC and FPGA design engineers with combined >40 years of experience. We successfully led several chips through the whole design to TO process. Familiar with Xilinx FPGA, we designed complicated system of using multiple FPGAs to verify complicated ASIC and also for the final products. We are interested in working as independent contractor for your projects. Feel free to contact us.
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9 Comments
  1. alexsdsd69 5 months ago
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    nice

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  2. jpchih 7 months ago
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    I can confirm it works for me. Good series. Lots of stuff to digest.

    5
  3. EinsX7 12 months ago
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    Critical Warning:
    Don’t pay! The website will take the money and tells you that tells you that the payment failed!

    1
    • Profile Photo Author
      SD-RTL-DGN 10 months ago
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      Your order somehow was canceled. Your payment was refunded. We are checking with website why it is canceled.

      0
  4. lazicb 1 year ago
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    WARNING:
    Don’t even try to pay, they will take the money of your credit card, but you won’t get subscription!

    0
    • Profile Photo Author
      SD-RTL-DGN 10 months ago
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      see above. Your order somehow was canceled and your payment was refunded

      0
  5. firoun 1 year ago
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    can you please stop charging $15 for your content? This is very useful tutorial for students.

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    • JingZh 1 year ago
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      We do pay for a good book? We also pay for physicians, barbers, gardeners for their service?

      0
  6. orr101 4 years ago
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    With all due respect, 15$ or 3 months of your content is WAAAY too much.

    0

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