Conceptual Questions (Newbie question)

Discussion in 'General Electronics Chat' started by NY10, Jul 30, 2010.

  1. NY10

    Thread Starter Member

    Jul 30, 2010
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    Hi, all

    Can anyone explain what JTAG in detail ? (It looks like it is something to do with FPGA)

    I searched and read some of descriptions, but I am a bit confused.

    If someone can make it easy to understand, appreciate it.

    Thank you very much.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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  3. NY10

    Thread Starter Member

    Jul 30, 2010
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    Can you elaborate more ?

    I already read it on the wikipedia before posting it. I thought maybe I could get some different explanation.
     
  4. Papabravo

    Expert

    Feb 24, 2006
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    I really broad terms it provides a way to connect lots of flip-flops in a very long shift register to establish an initial condition. Then the test fixture will clock all of the flip-flops in the test chain some number of times. Then it will dump the very long shift register and look for an expected value(s). That is the test philosophy in a nutshell so to speak.
     
    NY10 likes this.
  5. Papabravo

    Expert

    Feb 24, 2006
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    Did you actually understand what you read there?
     
  6. hgmjr

    Moderator

    Jan 28, 2005
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    Include the phrase "boundary scan" in your google search.

    hgmjr
     
  7. hgmjr

    Moderator

    Jan 28, 2005
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    JTAG was established to provide a means of testing boards once surface mount technology became widely used. Keep in mind that in order to take advantage of JTAG testing, the device or devices you are testing must have been designed to meet the JTAG standard.

    hgmjr
     
  8. bertus

    Administrator

    Apr 5, 2008
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