In reply to Ashishkumar072:
Several issues. It looks like you cut & pasted through Word, which changed the quotes, and capitalized some words. I cleaned up your test case and created a small example. You had the wrong syntax for the $value$plusargs argument, so I fixed that too.
module tb;
bit [7:0] axi_awaddr_up_master_min=255;
initial begin
if ($value$plusargs("axi_awaddr_up_master_min=%d", axi_awaddr_up_master_min))
$display("Arg found");
else
$display("Arg not found");
$display("axi_awaddr_up_master_min=%0d", axi_awaddr_up_master_min);
end
endmodule
This runs on Questa Edit code - EDA Playground
You probably have a scripting issue that you need to debug. The plusarg is probably being lost or transformed in the bad simulation.