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What is the triagular symbols shown in the image, is it a buffer or some kind of delay?

enter image description here

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    \$\begingroup\$ It looks like a non-inverting buffer, but could just be indicating the direction the signal is being driven. In this example it could possibly be to introduce a delay so the clocks are triggered right-to-left rather than all at once \$\endgroup\$
    – Frog
    Jun 4 '21 at 9:58
  • \$\begingroup\$ Given the title "controlling clock skew" it indicates a buffer, which adds some skew. \$\endgroup\$ Jun 4 '21 at 12:05
  • \$\begingroup\$ Please accept an answer as solution once it solves your problem. I have noticed that you are asking questions here, but you never acknowledge any of the answers till now. That's not a fruitful way of using EESE. \$\endgroup\$
    – Mitu Raj
    Jun 5 '21 at 12:35
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Yes, that's the standard representation of a buffer. What you see are clock buffers which are present there to not degrade the rise and fall times of the clock. As typically clock nets have high fan-out, you need high drive strength to ensure that a nice square wave reaches all the registers.

And yes, it introduces a delay in that path. For instance, in your particular example, the clock edge reaches U2 slightly later than at U3, approximately equal to the buffer delay \$\delta\$. This difference is called clock skew.

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