showstack / glossary / skew
Skew 時間偏差
The gap in arrival time between signals that are supposed to land together. On a parallel bus, skew is why wide, fast parallel interfaces stopped scaling — every wire's propagation delay drifts slightly, and at high clock rates that drift corrupts the word being read. It is one of the main reasons almost everything fast today — USB, SATA, PCIe, Ethernet — went serial instead of parallel.
中文
本應同時到達的訊號之間的到達時間差。在多對纜線、多路影像或多台機器同步時都會出現。
Easy to get wrong
On analogue videotape decks, "skew" is a tension control fixing the top of the picture bending left or right — a mechanical tape problem, unrelated to digital timing.
Where it shows up on the wire
Sources
- Clock skew — Wikipedia primary
- Chapter 10: Connecting and Operating the VTR — Video Preservation Website (Conservation OnLine)
Understand the mechanism
Something wrong, or missing?
Known gaps on this entry: regional_variants. If you can source one of them, that is a ten minute pull request.
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