axi_ltc2387: Update intf

Signed-off-by: Stanca Pop <stanca.pop@analog.com>

Author: StancaPop

library/axi_ltc2387/axi_ltc2387_if.v

@@ -113,8 +113,13 @@ module axi_ltc2387_if #(
   always @(posedge dco) begin
     adc_data_da_p <= {adc_data_da_p[WIDTH-1:0], da_p_int_s};
     adc_data_da_n <= {adc_data_da_n[WIDTH-1:0], da_n_int_s};
-    adc_data_db_p <= {adc_data_db_p[WIDTH-1:0], db_p_int_s};
-    adc_data_db_n <= {adc_data_db_n[WIDTH-1:0], db_n_int_s};
+    if (TWOLANES) begin
+      adc_data_db_p <= {adc_data_db_p[WIDTH-1:0], db_p_int_s};
+      adc_data_db_n <= {adc_data_db_n[WIDTH-1:0], db_n_int_s};
+    end else begin
+      adc_data_db_p <= 'd0;
+      adc_data_db_n <= 'd0;
+    end
   end
 
   // bits rearrangement
@@ -222,6 +227,9 @@ module axi_ltc2387_if #(
       .delay_rst (delay_rst),
       .delay_locked ());
   end else begin
+    // when in one-lane mode, tie them to 0,
+    // otherwise the input pin of input buffer
+    // will have an illegal connection to logic constant value
     assign db_p_int_s = 1'b0;
     assign db_n_int_s = 1'b0;
   end