|  | // Copyright 2020-2022 F4PGA Authors | 
|  | // | 
|  | // Licensed under the Apache License, Version 2.0 (the "License"); | 
|  | // you may not use this file except in compliance with the License. | 
|  | // You may obtain a copy of the License at | 
|  | // | 
|  | //     http://www.apache.org/licenses/LICENSE-2.0 | 
|  | // | 
|  | // Unless required by applicable law or agreed to in writing, software | 
|  | // distributed under the License is distributed on an "AS IS" BASIS, | 
|  | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | 
|  | // See the License for the specific language governing permissions and | 
|  | // limitations under the License. | 
|  | // | 
|  | // SPDX-License-Identifier: Apache-2.0 | 
|  |  | 
|  | (* keep_hierarchy *) | 
|  | module my_lut ( | 
|  | input  wire [3:0] i, | 
|  | output wire       o | 
|  | ); | 
|  |  | 
|  | LUT4 #( | 
|  | .INIT(16'hAAAA) | 
|  | ) my_lut ( | 
|  | .I0(i[0]), | 
|  | .I1(i[1]), | 
|  | .I2(i[2]), | 
|  | .I3(1'bx), | 
|  | .O (o) | 
|  | ); | 
|  |  | 
|  | endmodule | 
|  |  | 
|  | module my_top ( | 
|  | input  wire i, | 
|  | output wire o | 
|  | ); | 
|  |  | 
|  | my_lut my_lut ( | 
|  | .i({1'b0, 1'b1, i}), | 
|  | .o(o) | 
|  | ); | 
|  |  | 
|  | endmodule |