---
+ Post New Thread
Results 1 to 4 of 4
  1. #1
    Full Member level 5
    Points: 2,789, Level: 12

    Join Date
    Apr 2005
    Posts
    284
    Helped
    5 / 5
    Points
    2,789
    Level
    12

    shift and capture in dft

    In the scan pattern test:

    1. scan shift clock is the same clock as caputure clock ? ,and was provided by ATE clock?

    2. anyone have done a At-speed test with DFT compiler or anything else

    •   Alt22nd June 2007, 06:18

      advertising

        
       

  2. #2
    Full Member level 1
    Points: 1,969, Level: 10
    dft_guy's Avatar
    Join Date
    Oct 2006
    Location
    USA
    Posts
    113
    Helped
    22 / 22
    Points
    1,969
    Level
    10

    capture clock

    For normal 'stuck-at' scan patterns, the shift clock is normally provided by the same source (the ATE). Using some fancy tricks, you can, for at-speed scan, enable the internal clocks to do the capture. This is usually done only if the ATE cannot provide a fast enough clock for at-speed capture, and this must be specifically designed in the clock generation circuitry.

    But the ATPG tool, must understand, in any case, how to control those clocks in a deterministic way, or else it can't generate patterns.

    Other than the clock-gating design mentioned above, at-speed scan is normally dealt with at ATPG time, especially with regards to mult-cycle paths, false paths and clock domain crossings. These obviously can't be tested at-speed, and are usually masked out.

    John
    DFT Digest



    •   Alt22nd June 2007, 20:48

      advertising

        
       

  3. #3
    Full Member level 6
    Points: 3,033, Level: 12

    Join Date
    Jul 2002
    Posts
    337
    Helped
    7 / 7
    Points
    3,033
    Level
    12

    dft scan shift capture

    hi,
    I think it should do at-speed teste in tetramax, dftc only provide a stil protocol file and we have to modify it to adjust to at-speed test.



    •   Alt24th June 2007, 04:23

      advertising

        
       

  4. #4
    Full Member level 4
    Points: 2,409, Level: 11

    Join Date
    Sep 2003
    Posts
    194
    Helped
    6 / 6
    Points
    2,409
    Level
    11

    shift clock capture clock

    u can use TK do all of them. easy to use.



+ Post New Thread
Please login