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SPOILER ALERT: I figured this one out, but since I'd already typed up most of the question, here it is anyhow posted to the public domain. Comments welcome. --------------------------------------------------------------------------------------------------------------------------------------------------------------------- Who can tell me how to pass a hex value into Systemverilog using uvm_cmdline_processor? My current code is shown below as well as the command line option that is supplied. code snippet: bit [31:0] stimulus_xyz_min = 32'h12121212; // *** setting default here works fine `uvm_info(get_type_name(), $psprintf("1st TEST-SETTINGS. xyz_min=%8h",stimulus_xyz_min), UVM_LOW) if (cmdline_proc.get_arg_values(.match("+xyz_min="), .values(arg_values))) begin stimulus_xyz_min = arg_values[$]; end `uvm_info(get_type_name(), $psprintf("2nd TEST-SETTINGS. xyz_min=%8h",stimulus_xyz_min), UVM_LOW) command line option: //** this value passed in from cmdline is not properly recognized +xyz_min=09090909 The edited (for clarity) output is here (where you can see that the above +xyz_min did not 'take'): 1st TEST-SETTINGS. xyz_min=12121212 2nd TEST-SETTINGS. xyz_min=30393039 More +options/results data points listed here: +xyz_min=09090909 2nd TEST-SETTINGS. xyz_min=30393039 +xyz_min=00000000 2nd TEST-SETTINGS. xyz_min=30303030 +xyz_min=00000001 2nd TEST-SETTINGS. xyz_min=30303031 +xyz_min=00000002 2nd TEST-SETTINGS. xyz_min=30303032 +xyz_min=00000020 2nd TEST-SETTINGS. xyz_min=30303230 Woo-hoo. I looked at some other code I was using, which used stimulus_lkj = arg_values[$].atoi(); and then in the sv spec found atohex. Using the following worked (emphasis on .atohex()). `uvm_info(get_type_name(), $psprintf("1st TEST-SETTINGS. xyz_min=%8h",stimulus_xyz_min), UVM_LOW) if (cmdline_proc.get_arg_values(.match("+xyz_min="), .values(arg_values))) begin stimulus_xyz_min = arg_values[$].atohex(); end `uvm_info(get_type_name(), $psprintf("2nd TEST-SETTINGS. xyz_min=%8h",stimulus_xyz_min), UVM_LOW) +xyz_min=1ACECAFE 2nd TEST-SETTINGS. xyz_min=1acecafe Even thoe I initially thought I was seeing the ASCII values, I mistakenly looked at an ASCII table of decimal-to-char, instead of hex-to-char, which further confused me. I'd even tried this (as a wild hope that cmdline_processor would recognize it): +xyz_min=0x12121212 +xyz_min=32'h12121212