cells/dfbbn/sky130_fd_sc_hs__dfbbn.functional.v

/*
 * Copyright 2020 The SkyWater PDK 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
 *
 *     https://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
*/


`ifndef SKY130_FD_SC_HS__DFBBN_FUNCTIONAL_V
`define SKY130_FD_SC_HS__DFBBN_FUNCTIONAL_V

/**
 * dfbbn: Delay flop, inverted set, inverted reset, inverted clock,
 *        complementary outputs.
 *
 * Verilog simulation functional model.
 */

`timescale 1ns / 1ps
`default_nettype none

// Import sub cells.
`include "../u_dfb_setdom_pg/sky130_fd_sc_hs__u_dfb_setdom_pg.v"

`celldefine
module sky130_fd_sc_hs__dfbbn (
    Q      ,
    Q_N    ,
    D      ,
    CLK_N  ,
    SET_B  ,
    RESET_B,
    VPWR   ,
    VGND
);

    // Module ports
    output Q      ;
    output Q_N    ;
    input  D      ;
    input  CLK_N  ;
    input  SET_B  ;
    input  RESET_B;
    input  VPWR   ;
    input  VGND   ;

    // Local signals
    wire RESET          ;
    wire SET            ;
    wire CLK            ;
    wire buf_Q          ;
    wire CLK_N_delayed  ;
    wire RESET_B_delayed;
    wire SET_B_delayed  ;

    //                               Delay       Name              Output  Other arguments
    not                                          not0             (RESET , RESET_B                       );
    not                                          not1             (SET   , SET_B                         );
    not                                          not2             (CLK   , CLK_N                         );
    sky130_fd_sc_hs__u_dfb_setdom_pg `UNIT_DELAY u_dfb_setdom_pg0 (buf_Q , SET, RESET, CLK, D, VPWR, VGND);
    buf                                          buf0             (Q     , buf_Q                         );
    not                                          not3             (Q_N   , buf_Q                         );

endmodule
`endcelldefine

`default_nettype wire
`endif  // SKY130_FD_SC_HS__DFBBN_FUNCTIONAL_V