Parameterized UVM Environment Creation Issue.

You can't store your agents with different parameterizations in the same array. For example, agent #(64) is a totally different class than agent #(128), even though they specialize the same parameterized class.

Thanks for your response Tudor timi, now I checked with single agent flow like below, class driver (parameter DATAWIDTH=32)

bit[DATAWIDTH-1:0]data;

endclass:driver

class agent(parameter DATAWIDTH=32)

driver#(DATAWIDTH) driver_m; function build_phase();
driver_m = driver#(DATAWIDTH)::type_id::create("driver", this); endfunction
endclass agent

class env();

agent#(64) agent_m;

function build_phase();

agent_m=agent#(64)::type_id::create("agent", this)

endfunction

endclass:env when we Tried above setup we are getting below error, driver_m = driver#(DATAWIDTH)::type_id::create("driver", this);
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ncelab: *E,TYCMPAT (agent.sv,15|58): assignment operator type check failed (expecting datatype compatible with 'class $unit::driver#(.DATAWIDTH(32))' but found 'class $unit::driver#(.DATAWIDTH(64))' instead).
can you please share Information how to solve This Issue. thanks, selvavinayakam.na

The original answer was right. The problem is in the declaration of the agent_m array. Because each instance of the parameterized agent is of a different width, each is a completely different type according to SystemVerilog rules.

The declaration:

  agent agent_m[3];

declares an array of 3 handles to agent#(32) class objects. That is because the default parameter for DATAWIDTH is 32. That's why you can't assign a 64 bit wide agent's handle to it.

The workaround is to declare the agent_m array to be of the base class from which the specialized agent classes are derived.

  uvm_agent agent_m[3];

This array can store any flavor of agent handle as long as it is of a class derived from uvm_agent. But remember, when you go to use them, you have to type cast them.

  agent#(32) agent0;

  if ( !$cast(agent0,agent_m[0]) ) uvm_fatal(...);

Hi TAM Thanks for your Information is possible to share the full information with any example. Because It will helpful for us to understand.

Thanks,

selvavinayakam.na

Hi,

I was facing the same issue when i am creating multiple Parameterized agent.

You just will have to do is :

// UVM Automation macros
`uvm_component_utils(agent#(DATA_WIDTH));

Here you will have to declare parameterize uvm automation macros in all the class where you have used the parametrization in class.

please let me know if there is a issue.

Regards,

Dhaval

Hi, I'm facing similar issue where I have a lot of agents whose sequencers are parameterized by width. I want to push them all in a associative array and there is no way to do it as it is giving type mismatch coz of parameterization. May I know how you resolved this issue. If you could provide some code example that will be great. 

Hi Don't you have to use 

`uvm_component_param_utils(agent#(DATA_WIDTH));

I'm having similar issue but with array of uvm sequencers. Declaring the base of the array as a uvm_sequencer doesn't seem to work when assigning parameterized sequencers to the array element.

I'm getting a compile time error for type mismatch.