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Encounter Test: write a pin assigment file

oalpago

Hi all,

I'm a novice with Encounter Test and I need some help to write the pin assigment file. My design has the folowing inputs an outputs:

- si (scan in)

- se (shift enable for test mode)

- tm (tm=1 : test mode, tm = 0: functional mode)

- clk1 (functional clock, posdege active)

- clk2 (functional clock, posedge active)

- tm_clk (test mode clock, posedge active)

- rst (asynchonous reset, low active)

- so (scan out)

 - functional inputs

- functional outputs0

 The design has to clock domains (ck1 and clk2) and just one scan chain.

clk1 and tm_clk are multiplexed and tm is the select signal. Also, clk2 and tm_clk are multiplexed and tm is the select signal.

Can anybody give me some guidelines to write the pin assigment file?

Thanks a lot,

OC.

 

 

 

 

  • Pin assignment file is generated by RTL compiler when doing DFT synthesis flow. At the end of the sythesis flow, you can run "write_et_atpg" to generate those files needed by ET. 

    If its not available in your case, you can easily write one up. Pin assignment need three information for every pin assigned for ATPG. The first is pin name, second the pin functionality and third the levels at that pin. 

    Pin functions:

     TI – Test Inhibit - set throughout test application
    TC – Test Constraint – set during capture cycles
    SE – Scan Enable – set during shift
    SI, SO – Scan Ins/Outs
    SC – non shift system clock (edge triggered or level sensitive)
    ES – shift + system clock (edge triggered)
    EC – shift only clock (edge triggered)

     Levels

    - , 0
    +, 1
     Z

    For an example,

     assign pin=se     test_function= +SE;     # shift_enable

      assign pin=tm_clk     test_function= -ES;  # test clock

      assign pin=tm  test_function = +TI;   # test mode

    Regards. 

  •  Thanks for your answer!!! I'm gonna try with wrtite_et_atpg command from RTL Compiler then.

    OC.

  • Hi

    Can anyone provide a sample pin assign file with compression and OPCG enabled.

    If possible provide sample of all pinassign files.

     

     

    Thanks

    Srikanth 

     

     

     

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