module adq_dqs2_abstract (
         strobe_io,
         strobe_n_io
);

parameter USE_OUTPUT_STROBE = "true";
parameter DIFFERENTIAL_OUTPUT_STROBE = "false";
parameter USE_BIDIR_STROBE = "false";

inout strobe_io;
inout strobe_n_io;

localparam DELAY_WIDTH = 32;

wire [DELAY_WIDTH-1:0] dqs_out_dtap_delay;

generate
if (USE_OUTPUT_STROBE == "true")
begin: output_strobe
         wire aligned_os_oe;
         wire aligned_strobe;

         if (USE_BIDIR_STROBE == "true")
         begin
                 reg strobe_r = 1'b0;
                 reg strobe_n_r = 1'b0;
                 always @(aligned_os_oe or aligned_strobe)
                 begin
                         strobe_r =/*<= #(dqs_out_dtap_delay)*/ ~aligned_os_oe ? aligned_strobe : 1'bz;
                         if (DIFFERENTIAL_OUTPUT_STROBE=="true")
                                 strobe_n_r =/*<= #(dqs_out_dtap_delay)*/ ~aligned_os_oe ? ~aligned_strobe : 1'bz;
                 end
                 assign strobe_io = strobe_r;
                 if (DIFFERENTIAL_OUTPUT_STROBE=="true")
                         assign strobe_n_io = strobe_n_r;
         end

end 
endgenerate

endmodule


module adqdqs (
         strobe_io,
         strobe_n_io
);

inout strobe_io;
inout strobe_n_io;

         adq_dqs2_abstract adq_dqs2_inst (
                 .strobe_io( strobe_io),
                 .strobe_n_io( strobe_n_io)

         );
         defparam adq_dqs2_inst.USE_OUTPUT_STROBE = "true";
         defparam adq_dqs2_inst.DIFFERENTIAL_OUTPUT_STROBE = "true";
         defparam adq_dqs2_inst.USE_BIDIR_STROBE = "true";

endmodule

verilator --cc test.v --top-module adqdqs
%Error: test.v:24: Unsupported tristate construct: BEGIN 'genblk1'