SystemVerilog Convert `define Concatenated String Evaluated into Int Definition

Question

I have a long list defines defining with numerous properties for these registers. I'd like to have a function that takes the string of the register name and concatenates the bigdefine name and evaluates the `define int value upon process.

A simple function called liked the following:

PrintRegInfor(REGA);

Here's the class code that doesnt work:

`define CHIP_REGA_ADDR   16'h0000
`define CHIP_REGA_RESET_VAL   0
`define CHIP_REGB_ADDR   16'h0100
`define CHIP_REGB_RESET_VAL   1

.
.
`define CHIP_REGZ_ADDR       16'h1000
`define CHIP_REGZ_RESET_VAL  0

clase module;
function PrintRegInfo(string reg_name)
    string reg_reset_string;
    string reg_addr_string;
    int reg_reset_int;
    int reg_addr_int;
    reg_reset_string = {"`CHIP_",reg_name,"_RESET_VAL"};
    reg_addr_string = {"`CHIP_",reg_name,"_ADDR"};
    reg_reset_int = reg_reset_string;
    reg_add_int = reg_add_string;
    $display("Reg %s at address 0x%x has a reset value of 0x%x\n",reg_name, reg_add_int,reg_reset_int);
endfunction
endclass

It looks like the conversion of string to int is converting the actual string from the ascii value into int. I'd like it to evaluate the `define of the string created. Is this possible?

I would like to get:

Reg Rega at address 0x0000 has a reset value of 0x0

I get something like: Reg Rega at address 0x3478 has a reset value of 0x8373

Thanks!

dave_59 dave_59 · Accepted Answer · 2018-06-24T16:10:27

You cannot use string variables to form identifiers in procedural code. You could create a macro to do this

`define PrintRegInfo(reg_name) \
  $display("Reg %s at address 0x%x has a reset value of 0x%x\n", `"reg_name`", \
 `CHIP_``reg_name``_ADDR, \
  `CHIP_``reg_name``RESET_VAL);

However, the argument you pass to the macro cannot be a string variable. You might rethink the way you organize your data by not using define statements and instead create a database with associative arrays.

SystemVerilog Convert `define Concatenated String Evaluated into Int Definition

1 Answers