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 Altos Liberate: Power - Troubleshooting 

Last post Mon, Dec 17 2012 10:19 AM by Doug Roston. 2 replies.
Started by Eberhard2010 26 Jun 2012 05:34 AM. Topic has 2 replies and 1965 views
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  • Tue, Jun 26 2012 5:34 AM

    • Eberhard2010
    • Not Ranked
    • Joined on Tue, Apr 10 2012
    • Karlsruhe, Baden-Wurttemberg
    • Posts 7
    • Points 110
    Altos Liberate: Power - Troubleshooting Reply

    Hi guys,

    I'm using liberate to characterize standard cells which have a proprietary Transistor model, written in verilogA. Therefore I use spectre for simulation. First of all I wanna mention, that there is less guidance for how to set up another simulator than Aspice. Fortuneatly spectre gives also "*.mt0-Files" with the measurement results liberate expects. Unfortuneatly most of the liberate variables don't effect  the temporary netlists in the expected way. So there is a lot of try and error.

    Finally I gave up a wrote patches for the netlists with awk and sed.

    So it runs fine and every step seems to get a "PASS" in the map.lst File. (I use customized arcs for speed and certainty). E.g.:

    Jun 26 12:05:25 Thread 0: Cell=NOR2X1 (20%)     Pin=QN   Related=IN1  combinational  rise_transition  ...
    Jun 26 12:13:27 Thread 0: Cell=NOR2X1 (40%)     Pin=QN   Related=IN2  combinational  rise_transition  ...
    Jun 26 12:20:52 Thread 0: Cell=NOR2X1 (60%)     Pin=QN   Related=IN1  combinational  fall_transition  ...
    Jun 26 12:28:46 Thread 0: Cell=NOR2X1 (80%)     Pin=QN   Related=IN2  combinational  fall_transition  ...
    Jun 26 12:35:56 Thread 0: Cell=NOR2X1 (85%)     Pin=IN1  Related=     rising_edge    rise_power      ...
    Jun 26 12:39:12 Thread 0: Cell=NOR2X1 (90%)     Pin=IN1  Related=     falling_edge   fall_power      ...
    Jun 26 12:42:38 Thread 0: Cell=NOR2X1 (95%)     Pin=IN2  Related=     rising_edge    rise_power      ...
    Jun 26 12:45:43 Thread 0: Cell=NOR2X1 (100%)    Pin=IN2  Related=     falling_edge   fall_power      ...
    Jun 26 12:48:59 Thread 0: Cell=NOR2X1 (100%)    Pin=     Related=     combinational  leakage_power   ...
    Jun 26 12:49:08 Thread 0: Cell=NOR2X1 (100%)    Pin=     Related=     combinational  leakage_power   ...
    Jun 26 12:49:21 Thread 0: Cell=NOR2X1 (100%)    Pin=     Related=     combinational  leakage_power   ...
    Jun 26 12:49:31 Thread 0: Cell=NOR2X1 (100%)    Pin=     Related=     combinational  leakage_power   ...

    ..But then

    Performance statistics for NOR2X1: Spectre cpu time = 2521.2 seconds, total cpu time = 2521.2 seconds, wall clock time = 2668.0 seconds.
    Error: cell NOR2X1 pin=QN related_pin=IN1 number of power results = 0, but 16 expected
    Error: cell NOR2X1 pin=QN related_pin=IN2 number of power results = 0, but 16 expected
    Error: cell NOR2X1 pin=QN related_pin=IN1 number of power results = 0, but 16 expected
    Error: cell NOR2X1 pin=QN related_pin=IN2 number of power results = 0, but 16 expected
    Error: cell NOR2X1 pin=IN1 related_pin= number of power results = 0, but 4 expected

    However the "*.mt0-Files" give results for Leakage etc:

    ....altosleakage0 altosleakage1 temper alter#
    2.959903e-09 3.905627e-09 27 1

    I already scaled the values up but i looks like they will be ignored anyway. No idea why liberate don't get it. Until now I tried:

    set_operating_condition -temp 27 -voltage 0.9
    set VDD_voltage 0.9
    set GND_voltage 0

    set_vdd -type primary VDD1 ${VDD_voltage}
    set_gnd -type primary GND1 ${GND_voltage}

    set_var leakage_add_input_pin 1
    set_var leakage_mode 1
    set_var leakage_accuracy_mode 1
    #set_var leakage_precision "%g"
    set_var leakage_sim_duration "2e-12"

    Nothing seems to help here. Please, Has anybody an idea?

    Regards Eberhard

     

    • Post Points: 20
  • Thu, Jul 5 2012 8:09 AM

    • Eberhard2010
    • Not Ranked
    • Joined on Tue, Apr 10 2012
    • Karlsruhe, Baden-Wurttemberg
    • Posts 7
    • Points 110
    Re: Altos Liberate: Power - Troubleshooting Reply

    Hi guys,

    seems that noone had this problem before? ... or noone use ALTOS liberate :-) ... If you can give a hint, it would be very nice.

    Regards Eberhard2010

     

    • Post Points: 5
  • Mon, Dec 17 2012 10:19 AM

    Re: Altos Liberate: Power - Troubleshooting Reply

    Eberhard,

    I just saw your post.  Is this issue still open?  If so, let me know where you are located. I work for Cadence supporting the Altos characteriation tools.  Either I can help you or I can help put someone in touch with you who can help you.

    When you see a message about results=0 but 16 expected, it is a sign the simulation did not run correctly.  I would need more information about your setup. 

     Let me know if you still need help with this.

     Doug

    • Post Points: 5
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Started by Eberhard2010 at 26 Jun 2012 05:34 AM. Topic has 2 replies.