# ** Error: (vsim-3036) Instantiation depth of '/fulladd_TB/dut' is 222. Assuming recursive instantiation. # Time: 0 ns Iteration: 0 Instance: /fulladd_TB/dut File: C:/Users/win 10/Desktop/codes/bitt.v # ** Error: (vsim-3036) Instantiation depth

This could be due to the module name and the instance name are the same. Example:

​

module counter_tb;

reg clk, reset, enable;

wire [3:0] count;

counter_tb U0 (

.clk (clk),

.reset (reset),

.enable (enable),

.count (count)

);

endmodule

Try rename one of them (counter_tb) into a different name.

By sharing your code, then I can further debug and provide a better answer.

p.s. Don’t forget to Reply, and Select the Best Answer. :)