Different RESET Type on UVM register model

UVM
,
1

Dear All,

I’m trying to make a UVM RAL Model( register map) which is resetted by multiple reset type signal.

For example
There are 3 registers A, B, C. and each Register is reseted by other reset signal.

If I want make a register model with 3 registers, Should I have to make each of them by separately? then do I need to combine it into one UVM register model? Or doesn’t it need to care of reset type?

I’m not familiar with this, Could you please guide this ?

2

In reply to UVM_LOVE:

The register reset is defined on register maps and registers.
You can execute get_regsiters and store all registers in a queue. Then you can run a loop to reset the single registers with the exception of the excluded registers.

3

In reply to chr_sue:

In reply to UVM_LOVE:
The register reset is defined on register maps and registers.
You can execute get_regsiters and store all registers in a queue. Then you can run a loop to reset the single registers with the exception of the excluded registers.

I found the usage of “set_reset” in UVM Register Model Example


class ral_cfg_timer extends uvm_reg;
	uvm_reg_field timer;     // Time for which it blinks

	`uvm_object_utils(ral_cfg_timer)
	function new(string name = "traffic_cfg_timer");
		super.new(name, 32,build_coverage(UVM_NO_COVERAGE));
	endfunction

  virtual function void build();
     this.timer = uvm_reg_field::type_id::create("timer",,get_full_name());

    // configure(parent, size, lsb_pos, access, volatile, reset, has_reset, is_rand, individually_accessible); 
     this.timer.configure(this, 32, 0, "RW", 0, 32'hCAFE1234, 1, 0, 1);
     this.timer.set_reset('h0, "SOFT");
  endfunction
endclass

I want to know the usage of “SOFT” from this.timer.set_reset('h0, “SOFT”); Especially, Whatdoes “SOFT” mean ? Could you give me the usage?

Some explains that from
Your text to link here…
as the below,

set_reset
virtual function void set_reset( uvm_reg_data_t value,
string kind = “HARD” )
Specify or modify the reset value for this field

I have 2 Questions

  1. Here used with HARD NOT SOFT?, does this mean that can I declare User-Defined reset signal?
  2. What IF SOFT, HARD are implemented in set_reset method, How do I excute SOFT, HARD reset and User-Defined Reset?
    Thank you in advance
4

In reply to UVM_LOVE:

set_reset allows you to modify the reset method defined in the register model.
There are at least 2 options, setting ‘HARD’ which is the default and another value ‘SOFT’. Nothing is specified what should happen in this case. You might use it from the software side (one suggestion).

5

let’s say my reg_blk.fo.reset(.kind(“HARD”); and my configure field of fo reg has has_reset value = 1, then fo will be resetted and if has_reset value = 0, then fo will remain same i.e., it’s previous value.

Now, if my reg_blk.fo.reset(.kind(“SOFT”); and my configure field of fo reg has has_reset value = 1, then fo will not be resetted, fo will remain same and if has_reset value = 0, then also fo will remain same i.e., it’s previous value.

As per my observation SOFT is not making any difference, it just returns the previously stored desirted and mirrored value & using HARD it just resets the fo reg when has_reset = 1. So, is this true?

6

What i thought HARD and SOFT will work like HARD will not be dependent on has_reset value i.e., in configure field of for register and SOFT should be dependent on has_reset value.
But the observed output is different. so what the corrected information?