UVM reg field access via name

UVM
, , , ,
1

Is anyone aware as to how we get the details of all the parent registers for a given bit field via name especially if the bit filed is spread over multiple registers … ?

In our register map … we have a bit field[ BIT_FIELD_NAME of width 10 bits] … spread over two registers 4 bits in one and remaining in another

When we try to get the following :

uvm_status_e status;
uvm_reg_data_t value;
string name1;
uvm_reg_field reg_field;
uvm_reg parent_reg;
name1 = “BIT_FIELD_NAME”;

reg_field=user_reg_block.user_reg_map0.get_field_by_name(name1);

parent_reg=reg_field.get_parent();

The above only returns the first parent register … is their a way in which i can get the entire list of parent registers … ?

2

In reply to mayurverf:

The brute force approach is to loop over all registers and collect all of them that have the field:


uvm_reg regs[$];
uvm_reg regs_with_field[$];
reg_map.get_registers(regs);

foreach (regs*)
  if (regs[i].get_field_by_name(field_name) != null)
    regs_with_field.push_back(regs[i]);

There’s a [i]get_fields(…)* function in uvm_reg_map that returns all fields in all regs. You could alternatively loop over those to find the fields with the same name and get their parents.

3

In reply to Tudor Timi:

Thanks Tudor,

Your suggestion should be able to give me the list … just one more question here …

is their any way i can get to know the which bits of the bit filed are present in the concerned register …

For e.g the 1st register would have bits [4:0] and the 2nd register would have bits [9:5] of the same bit field … ?

4

In reply to mayurverf:

All UVM REG classes provide introspection functions to be able to inspect various properties. The API docs should help you, such as this one for uvm_reg_field. You can get this information by calling get_lsb_pos() and get_n_bits() on each field object.

5

In reply to Tudor Timi:

Hi Tudor ,

Is there any way to set those fields by some value. I am using the same foreach loop to get all the registers.But performing some tasks in the fields of those registers.

For example : -

foreach (maps[j])
                   begin 
                       foreach (fields[k]) 
                          begin 
                             if(fields[k].get_n_bits()> 1)
                              begin 
                               for(int n = 0;n < fields[k].get_n_bits();n++)
                                  register_var[regidx].fields[k].set(data[n]);  //setting the desired value 
                              end
                           end
                    end

But this code is not working as the register variable do not have “fields” in them.

Thanks

6

In reply to pk_94:

Just do:


fields[k].set(data[n]);

The field already knows which register it belongs to.