GLOSSARY of Printed Circuits

       X

Index to terms on this page:

XLAT   XNet   XMC   XMII   XRF   xsignal   XSON   XYRS  

XLAT — translate, trasnlation or translator

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XNet — Cadence Allegro See xsignal

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XMC — Switched Mezzanine Card

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XMII — Cross-Wire (Two Wire Serial Management) Media Independent Interface. MII stands for Media Independent Interface, which is a component of Ethernet.

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XRF — [PCB Testing] X-Ray Fluorescence is an analytical technique that determines elemental composition. XRF analysis is used to test printed circuit boards (PCB), integrated circuits (IC), and individual electronic components. It's a quick, non-destructive, highly accurate analysis that can be conducted on solids, liquids, and powders.

It works on the process of ionization, meaning that the atoms within the sample material may ionize when exposed to gamma rays or other short-wavelength x-ray beams. XRF is able to determine elemental composition by measuring the secondary x-ray beam, being the fluorescent x-ray, emitted from the tested sample when it is excited by a primary x-ray source.
XRF Analysis - Sensible Micro Corporation

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xsignal — Extended signal. Altium Designer - xSignal The capitalization of S in xSignal is a format used by Altium. In an xSignal, multiple nets can be treated as a single signal for the purpose of length matching. The simplest example is a net that starts on an IC pin, terminates on a resitor and then the signal continues from the other side of the resistor to another IC. The signal length is the first net plus the path through the resistor plus the second net. Using the xSignal mode, the designer can define this total path to be an xSignal. When there is a group of such signals, each having the pattern of IC1 pin x > resistor Rn > IC2 pin y and whose lengths need to be matched for signal integrity or high-speed design, the designer would use a design rule based on the xSignal lengths rather than the individual net lengths.
This allows the individual first nets to be different in length. The same goes for the individual second net lengths. Using xSignals enables one to meet any matched-length requirements of the design without having to match lengths of all of the first nets as a group and then all of the second nets as that group. Without xSignals, matching lengths would require more design time and PCB " real estate."

The above example is for the simplest possible situation. XSignals can wend there ways through multiple discetes and ICs. Altium Designer's xSignal wizard makes it easy to set up complex signal pathways for length matching.

In Cadence Allegro, this is called an "XNet" (extended net).

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XSON — eXtremely thin Small Outline package No leads. E.G. XSON6 has 6 lands with axial symmetry with pin numbering in a dual in-line pattern.

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XYRS — A file that provides numeric control for automatic component insertion.

The letters stand for:

• X - axis coordinate
• Y -axis coordinate
• R - Rotation
• S - Side