| // Copyright (C) 2020-2021  The SymbiFlow Authors. | 
 | // | 
 | // Use of this source code is governed by a ISC-style | 
 | // license that can be found in the LICENSE file or at | 
 | // https://opensource.org/licenses/ISC | 
 | // | 
 | // SPDX-License-Identifier:ISC | 
 |  | 
 | module top ( | 
 |     input wire clk0, | 
 |     input wire clk1, | 
 |     (* clkbuf_inhibit *) | 
 |     input wire clk2, | 
 |     (* clkbuf_inhibit *) | 
 |     input wire clk3, | 
 |  | 
 |     input  wire [3:0] d, | 
 |     output reg  [3:0] q | 
 | ); | 
 |  | 
 |   always @(posedge clk0) q[0] <= d[0]; | 
 |   always @(posedge clk1) q[1] <= d[1]; | 
 |   always @(posedge clk2) q[2] <= d[2]; | 
 |   always @(posedge clk3) q[3] <= d[3]; | 
 |  | 
 | endmodule |