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boundary scan feature

 
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Duval JP

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Joined: 22 Jun 2004
Posts: 923
Location: France

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PostPosted: Mon Sep 05, 2005 10:29 am    Post subject: boundary scan feature Reply with quote

Hello all,
I am French, and the smoothnesses of the English language are sometimes difficult for me.

For example I would like that somebody explains me if possible simply that wants to say
"JTAG"
"Boundary scan feature"

My dictionnary said Boundary=border border of what ?
Crying or Very sad

Many thanks

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DToolan

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Joined: 14 Aug 2004
Posts: 1384
Location: Dallas / Fort Worth, Texas (USA)

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PostPosted: Mon Sep 05, 2005 6:57 pm    Post subject: Reply with quote

The boundary (or border) on the small scale, refers to the outsides of a chip (the pins). On a larger scale, the boundary (or border) might be the edges (pins / fingers) of a printed circuit board.

The idea of "boundary scan" was devised by PCB manufacturers because of the increasing densities of board design. Board manufacturers used to build a "bed of nails" that touched every pad on a board and tested for continuity, opens or shorts. With pin spacings on chips growing closer together and chip spacings also growing closer, the "bed of nails" technique was more difficult to do.

Boundary-scan, as defined by the IEEE Std. 1149.1 standard, is an integrated method for testing interconnects on printed circuit boards that is implemented at the IC level. The boundary-scan test architecture provides a means to test interconnects between integrated circuits on a board without using physical test probes.
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Luciano

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Joined: 29 Nov 2004
Posts: 3149
Location: Italy

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PostPosted: Mon Sep 05, 2005 7:27 pm    Post subject: Reply with quote

Boundary-Scan Tutorial

http://www.corelis.com/products/Boundary-Scan_Tutorial.htm

Best regards,

Luciano
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Duval JP

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Joined: 22 Jun 2004
Posts: 923
Location: France

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PostPosted: Tue Sep 06, 2005 8:53 am    Post subject: Reply with quote

Many thanks to Luciano and Dtoolan,

I think, I understand now.
For maintenance it seems to be a very practical toool

Best regards
JP

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