Get uvm_config_db from uvm_sequence_item

UVM
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1

Hi All,

I have to pass a variable from the ENV via uvm_config_db to an agent’s item(uvm_sequence_item).
Since the item is a uvm_object, when i am using the uvm_config_db get_method i got the following error:
“Illegal assignment to class mtiUvm.uvm_pkg::uvm_component”

can you please advise, how can I properly get the variable.

Regards,
David.

2

In reply to D_S:

It looks like one of the variables involved is extended from a uvm_component. Please post the relevant code so someone can provide further guidance.

3

Difficult to say without looking at the code… but you may want to check if you are trying to use a variable derived from uvm_component to retrieve a uvm_sequence_item. from the config db.

4

Actually, I am trying to get the agent config class. which is set by the environment.

uvm_config_db #(axi4_agt_config#(DATA_WIDTH, USER_WIDTH, ID_WIDTH, DEST_WIDTH))::get(this, “”, “AXI4_AGNT_CONFIG”, m_cfg))

Thanks,

5

In reply to D_S:

And how does your set command look like?

6

Set from env class: (for multi agent instances)

uvm_config_db #(axi4_agent_config#(.DATA_WIDTH(DATA_WIDTH), .USER_WIDTH(2), .ID_WIDTH(0), .DEST_WIDTH(0)) )::set(this, “axi_agent_num_1*”, “AXI4_STREAM_CONFIG”, m_config.m_axi4_stream_data_in_1_config);

in the agent item (using typdef)

typedef axi4_agent_config;

class axi4_agent_item#(uint DATA_WIDTH = 32, uint USER_WIDTH = 32, uint ID_WIDTH = 4, uint DEST_WIDTH = 32) extends uvm_sequence_item;
.
.
.
axi4_agent_config#(DATA_WIDTH, USER_WIDTH, ID_WIDTH, DEST_WIDTH) m_cfg;
.
.
.
uvm_config_db #(axi4_agent_config#(DATA_WIDTH, USER_WIDTH, ID_WIDTH, DEST_WIDTH))::get(this, “”, “AXI4_AGENT_CONFIG”, m_cfg))

And the error from the simulator:
** Error: (vsim-7065) Illegal assignment to class mtiUvm.uvm_pkg::uvm_component from class tb_lib.axi4_agent_uvc_pkg::axi4_agent_item #(32, 2, 0, 0)

** Error: (vsim-8754) Actual input arg. of type ‘class tb_lib.axi4_stream_uvc_pkg::axi4_agent_item #(32, 2, 0, 0)’ for formal ‘cntxt’ of ‘get’ is not compatible with the formal’s type ‘class mtiUvm.uvm_pkg::uvm_component’.

I used typedef since in compilation the simulator doesn’t recognize the env config class.
and some issue since it’s a parametrized anent

thank you for the help

7

In reply to D_S:

In the set command you are restricting the usage of your config to your agent (axi_agent_num_1*).
But the seqauence is not the agent. Please try to use a wildcard instead.
And something is wrong with your forward typedef.
It should be

typedef class axi4_agent_config;
8

In reply to D_S:

Hi David,

I see few error in you code:

  1. In the get method you cannot use ::get(this,…). Since the config_db get method expects a component instance here. You are using get method in object_class so you can mention null here.

You can first try sending a value and then try with class. Following is an example:



//env class
int count;
uvm_config_db #(int)::set(this, "*", "count", 4);


// seq class

int repeat_count;

//inside body task

uvm_config_db #(int)::get(get_sequencer(), "", "count", repeat_count);