In reply to chr_sue:
virtual function void write(sequence_item pkt);
monitor.item_collected_port = vif.int_a
monitor.item_collected_port = vif.int_b
$display(“SCB:: Pkt recived”);
pkt.print();
endfunction : write
am write the write transaction in scoreboard i.e
from virtual interface int_a and int_b writing into the monitor.
is this write???
In reply to Prawin kumar:
This is wrong. In the write function you have to define what happens with the extracted transaction.
In the run_phase of the monitor you have to assemble your tarnsaction from the values of the virtual interface.
In reply to chr_sue:
OK i understand but in monitor ,
task;
@(vif.clk)
??? = vif.int_a;
??? = vif.int_b;
endtask
from the above code in ??? place what we mentioned ? there is know specific signal to store int_a and int_b;
In your monitor run_phase task you have to declare and construct a Transaction.Assign to the data memebers of this Transaction the corresponding Values from the Virtual interface.
If you have done this you Can write this transaction to the analysis port of your monitor.
In reply to chr_sue:
task run_phase(uvm_phase phase);
logic [2:0]in_a;
logic [2:0]in_b;
sequence_item transaction;
transaction = sequence_item::type_id::create(“transaction”);
in_a = vif.int_a;
in_b = vif.int_b;
@ (vif.clk);
item_collected_port.write(transaction);
`uvm_info("AC_LPC_MONITOR", $psprintf("Wrote transaction %s",transaction.convert2string()), UVM_LOW);
endtask:run_phase
Am coded like this, i had take in_a,in_b type of logic from the vif int_a and int_b trasaction to in_a,in_b.
even though scoreboard not compare this values.
In reply to Prawin kumar:
I strongly recommend to watch the videos from the UVM Courses!
You do not understand the TLM - Transaction Level Modelling. But this is key for the UVM.
Your run_phase Task should look like this:
task run_phase(uvm_phase phase);
sequence_item transaction;
transaction = sequence_item::type_id::create("transaction");
forever begin
@ (vif.clk);
transaction.in_a = vif.int_a;
transaction.in_b = vif.int_b;
item_collected_port.write(transaction);
`uvm_info("AC_LPC_MONITOR", $psprintf("Wrote transaction %s",transaction.convert2string()), UVM_LOW);
end
endtask:run_phase
In reply to chr_sue:
Yes, i watched the TLM transaction modeling.
i made the changes as per your suggestions
but scoreboard did not take values from components (MON,DRV).
did i made any mistake.
In reply to Prawin kumar:
You don’t send data from the driver to the scoreboard.
See the solution here:
In reply to chr_sue:
Tq mr chr_sue,
I modified scoreboard with my convince,i want out also with the inputs.
could you please help on this, run the below code and give me some suggestions
In reply to chr_sue:
1 @ (posedge vif.clk);
2 vif.int_a = seq.int_a;
3 vif.int_b = seq.int_b;
4 seq.outp = seq.int_a + seq.int_b;
why are you using line-4 hear, Tb only for stimulus generation purpose, why you using design in TB.
In reply to Prawin kumar:
seq.outp represents the result and works as the refernce model. This data is not driven to the design. I Could do this also in the scoreboard. Where to do this is a question of taste.
In reply to chr_sue:
uvm_test_top.env.agent.driver [ac_lpc_driver] Got Transaction int_a=3 int_b=4
#1 KERNEL: UVM_INFO /home/runner/testbench.sv(182) @ 50: uvm_test_top.env.agent.driver [AC_LPC_DRIVER] transaction int_a=3 int_b=4
#2 KERNEL: UVM_INFO /home/runner/testbench.sv(186) @ 50: uvm_test_top.env.agent.driver [ac_lpc_driver] item_done
#3 KERNEL: UVM_INFO /home/runner/testbench.sv(224) @ 50: uvm_test_top.env.agent.monitor [AC_LPC_MONITOR] Wrote transaction int_a=3 int_b=4 out= 0
I put the “`UVM_INFO” after DRIVER and MONITOR operations
am given inputs to dut(out=int_a + int_b) int=3,int_b=4 in line 1;
from the 2 line says about driver drive the that inputs into VIF i.e int_a=3,int=4; line 2 then,
in case for monitor
monitoring the data after DUT operation ,so int_a=3,int_b=4 displaying properly but out signal displayed as 0 ,from line 3 .
My question is : we are driving the inputs to VIF ,VIF instantiated with DUT in top then, in monitor we monitor inputs and output from VIF right even though it displaying output as “zero” .
In reply to Prawin kumar:
What you see is correct. @50 is the first edge of your clock. At that time the output from the DUT is not updated. It is still 0.
You are working on both clock edges. Is this your intention?
Please review in detail my solution I have provided to you!
In reply to chr_sue:
Hi chr_sue,
Finally i designed the code as per my requirements means how the my output displayed i.e ACTUAL and EXPECTED values ,
So,finally i got the solution for that with your great support.
Thanks,
Prawin
In reply to Prawin kumar:
What isStart of simulation and end of elaboration phases ??
Can i implement in my uvm code ?
Thanks,
Prawin
In reply to Prawin kumar:
start_of_simulation_phase and end_of_elobotation_phase are predefined phases in the UVM
In reply to Prawin kumar:
It is not a good solution to have functional coverage inside the monitor. Create a seperate coverage collector component and connet this to the analysis port of the monitor.
Best is to use as baseclas for the coverage collector uvm_subscriber.