module hierdefparam_top(input [7:0] A, output [7:0] Y); generate begin:foo hierdefparam_a mod_a(.A(A), .Y(Y)); end endgenerate defparam foo.mod_a.bar[0].mod_b.addvalue = 42; defparam foo.mod_a.bar[1].mod_b.addvalue = 43; endmodule module hierdefparam_a(input [7:0] A, output [7:0] Y); genvar i; generate for (i = 0; i < 2; i=i+1) begin:bar wire [7:0] a, y; hierdefparam_b mod_b(.A(a), .Y(y)); end endgenerate assign bar[0].a = A, bar[1].a = bar[0].y, Y = bar[1].y; endmodule module hierdefparam_b(input [7:0] A, output [7:0] Y); parameter [7:0] addvalue = 44; assign Y = A + addvalue; endmodule