How to use uvm_mem?

UVM
1

Hi, I want to set uvm_mem matched memory in the DUT.
So I want to write/read backdoor data into mem in the DUT.

But, I can’t find uvm_mem example not using uvm_reg

Is it impossible to set uvm_mem not using uvm_reg?

2

When you say you want to “set” uvm_mem, do you mean you want to call the set() method? There is no such method in uvm_mem.

1 Like
3

Hi, dave

“set” meant setting the uvm environment.
I wanted to control memory in DUT using uvm_mem as a backdoor

It’s a different way, i solved this problem using uvm_hdl_read. but it can’t write. But i don’t need it now

Thank you

4

Take a look at this EDA example UVM register user-defined memory backdoor; it provides a complete setup for backdoor access.
uvm_mem backdoor access is in this file my_mem_backdoor.sv. In your case, if you don’t need to model any registers; then you can directly instantiate the uvm_mem in your environment and configure it, so the environment build_phase will be something like


function void build_phase(uvm_phase phase);
    ......
   uvm_mem mem;
    my_mem_backdoor backdoor;
    mem = new("mem", ....);
    mem.add_hdl_path_slice("mem", ...);
    // other uvm_mem configuration if needed
    // Create backdoor and set it 
    backdoor = my_mem_backdoor::type_id::create("backdoor");
    mem.set_backdoor(backdoor);
  end
  
endfunction : build_phase
5

Thank you Ahmed.

Your answer is very helpful to me.
It’s not a normal way, I can write data using uvm_hdl_deposit as a backdoor without using uvm_mem.