Runtime Fatal Error : p_sequencer can't be casting from a parameterized sequencer

[caowangyang]

Hi, Dear All,

 

I have a very interesting problem here, image a multiple lanes (changeable) communication system, since some relationship maybe exist across those lanes, in order to model it, I just use a parameterized driver/sequencer in a verification environment, which looks like as:

class driver #(parameter LANES = 4) extends uvm_driver #(transaction #(LANES));

class sequencer #(parameter LANES = 4) extends uvm_sequencer #(transaction #(LANES));  

Simultaneously, I want to use following Macro in my sequence providing a handle pointed to the sequencer, as we know, called p_sequencer.

class pma_base_sequence #(parameter LANES = 4) extends uvm_sequence; 
  `uvm_declare_p_sequencer(sequencer #(LANES))

However, I got following runtime uvm_fatal error:

 

UVM_FATAL ../src/uvc/PMA/pma_sequence_lib.sv(15) @ 0: uvm_test_top.pma_agt.pma_seqr@@pma_base_seq [DCLPSQ] testbench_top.pma_base_sequence.m_set_p_sequencer uvm

est_top.pma_agt.pma_seqr.pma_base_seq Error casting p_sequencer, please verify that this sequence/sequence item is intended to execute on this type of sequencer

 

It looks like the casting from my parameterized sequencer above to specific p_sequencer failed, i.e. this statement failed:

$cast(p_sequencer, sequencer#(LANES))

I have no idea what's going on here, does anyone knew it ? I really appreciate if you can help me, thanks in advance !

[uwes]

hi,

 

>class pma_base_sequence #(parameter LANES = 4) extends uvm_sequence;
>`uvm_declare_p_sequencer(sequencer #(LANES))

 

i think it should be:

 

class pma_base_sequence #(parameter LANES = 4) extends uvm_sequence#(transaction #(LANES)); 

 

/uwe