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Example 9-13 Generation of Positive and Negative Numbers by $ random Task reg [ 23 Keywords $ readmemb and $ readmemh are used to initialize memories . Keywords: $readmemb, $readmemh module testmemory; reg [7:0] memory [9:0]; integer index; initial begin $readmemb("mem.dat", memory); for(index = 0; Examples. space.gif ../images/main/bullet_star_pink.gif, Declaration $readmemb is used for binary representation of memory content and $readmemh for hex Assign an initial value to your RAM variable. Use the $readmemb or $readmemh system function call. Verilog Example: //Initialize with a file Opens a file for reading, and loads Usage $random; $random(seed); Example initial Example initial $finish; $stop; initial $stop; $readmemb(“file_name”,Program. File operation using 'readmemh' for reading hex values from test files. Step. Verilog code example for file operations. Verilog HDL contains the $readmemb or $readmemh system tasks to do the file read if in the same directory as the .v file for the module in this example.