When i want to use a tlm port function in sequence by its parent sequencer which connect to monitor, i meet a trouble. It report a fatal, item from monitor is null! The code is below. Thanks for help!
class noc_slave_monitor extends noc_port_monitor;
uvm_blocking_peek_imp#(noc_slave_item, noc_slave_monitor) response_request_imp;
protected noc_slave_item item_pipeline[$];
.......
task listen_trans(noc_item trans);
noc_slave_item cur_item = noc_slave_item::type_id::create("cur_item");
super.listen_trans(trans);
item_pipeline.push_back(cur_item.clone());
endtask
virtual task peek(noc_slave_item item);
wait(item_pipeline.size() > 0);
item = item_pipeline.pop_front();
`uvm_info(get_name(), $sformatf("seq got one it from monitor, %08h", item.data[0][15:0]), UVM_HIGH)
endtask
endclass
class noc_slave_sequencer extends uvm_sequencer#(noc_slave_item);
uvm_blocking_peek_port#(noc_slave_item) response_request_port;
.......
function void build_phase(uvm_phase phase);
response_request_port = new("response_request_port", this);
endfunction
endclass
class noc_slave_agent extends uvm_agent;
noc_slave_monitor mon;
noc_slave_sequencer sqr;
......
`uvm_component_utils(noc_slave_agent)
......
function void connect_phase(uvm_phase phase);
super.connect_phase(phase);
......
sqr.response_request_port.connect(mon.response_request_imp);
......
endfunction
endclass
class noc_slave_base_sequence extends uvm_sequence;
`uvm_declare_p_sequencer(noc_slave_sequencer)
.......
task body();
noc_slave_item item;
forever begin
p_sequencer.response_request_port.peek(item);
if(item == null) begin
`uvm_fatal(get_name(), "item from monitor is null please check!")
end
`uvm_rand_send(item)
end
endtask
endclass