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NULL pointer dereference

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Hi,

I am building an uVC using uRM in SVCB for the First time.
When I wanted to Access the Transaction item from the Driver using "get_next_item" predefined task(defined in urm_driver class library) it is generating an error as,

Error!  NULL pointer dereference
          File: /tools/cadence/ius/tools/urm/src/urm/sv/urm_unit.svh, line = 119, pos = 25
         Scope: top.urm_unit::m_get_message_handler
          Time: 20 NS + 1
Verilog Stack Trace:
0: function top.urm_unit::m_get_message_handler at /tools/cadence/ius/tools/urm/src/urm/sv/urm_unit.svh:119
1: task top.urm_driver::get_next_item at /tools/cadence/ius/tools/urm/src/uvc/sv/urm_driver.sv:546
2: task top.master_bfm@876_2.drive_transfers at   sv/master_bfm.sv:85
3: process in top.master_bfm::run at /sv/master_bfm.sv:58

Infact I am not Using any TLM ports as of now.
I am Puzzled by this error, I will be Thankful for the Suggestions.

Regards,
Ramesh Pal Yadav


Originally posted in cdnusers.org by ramesh_pal_yadav
Parents

  • Hi Dave,
    I dont have a "Sequencer" Instance, Instaed i am accessing the "get_next_item" task from the urm_driver Base Class Library via.. urm_driver_set_sequences_and_item Macro.

       In BFM i have          
     driver.get_next_item(seq_item);    where Driver is the instance of my_driver which inherits urm_driver
      In my_driver i have
     `    urm_driver_set_sequences_and_item(sips_apb_master_transaction) 
    This macro initializes the sequence factory for the urm_driver base class method usage and defines the user-defined data item to use when executing urm_simple_sequence.

    This is how I have Implemented uVC Refering to the XBUS golden uVC example.
     
    I coudnt get what "Configuring the Sequencer" mean? ?
    I haven't started Generation yet and want keep the Basic SIMPLE sequence.I have just made the Environment UP and Proceeding to Work on BFM.

    Regards,
    Ramesh Pal
     


    Originally posted in cdnusers.org by ramesh_pal_yadav
Reply

  • Hi Dave,
    I dont have a "Sequencer" Instance, Instaed i am accessing the "get_next_item" task from the urm_driver Base Class Library via.. urm_driver_set_sequences_and_item Macro.

       In BFM i have          
     driver.get_next_item(seq_item);    where Driver is the instance of my_driver which inherits urm_driver
      In my_driver i have
     `    urm_driver_set_sequences_and_item(sips_apb_master_transaction) 
    This macro initializes the sequence factory for the urm_driver base class method usage and defines the user-defined data item to use when executing urm_simple_sequence.

    This is how I have Implemented uVC Refering to the XBUS golden uVC example.
     
    I coudnt get what "Configuring the Sequencer" mean? ?
    I haven't started Generation yet and want keep the Basic SIMPLE sequence.I have just made the Environment UP and Proceeding to Work on BFM.

    Regards,
    Ramesh Pal
     


    Originally posted in cdnusers.org by ramesh_pal_yadav
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