a2o/dev/verilog/trilib/tri_rlmlatch_p.v

// © IBM Corp. 2022
// Licensed under the Apache License, Version 2.0 (the "License"), as modified by
// the terms below; you may not use the files in this repository except in
// compliance with the License as modified.
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
//
// Modified Terms:
//
//    1) For the purpose of the patent license granted to you in Section 3 of the
//    License, the "Work" hereby includes implementations of the work of authorship
//    in physical form.
//
//    2) Notwithstanding any terms to the contrary in the License, any licenses
//    necessary for implementation of the Work that are available from OpenPOWER
//    via the Power ISA End User License Agreement (EULA) are explicitly excluded
//    hereunder, and may be obtained from OpenPOWER under the terms and conditions
//    of the EULA.
//
// Unless required by applicable law or agreed to in writing, the reference design
// 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.
//
// Additional rights, including the ability to physically implement a softcore that
// is compliant with the required sections of the Power ISA Specification, are
// available at no cost under the terms of the OpenPOWER Power ISA EULA, which can be
// obtained (along with the Power ISA) here: https://openpowerfoundation.org.

`timescale 1 ns / 1 ns

// *!****************************************************************
// *! FILENAME    : tri_rlmlatch_p.v
// *! DESCRIPTION : 1-bit latch, LCB included
// *!****************************************************************

`include "tri_a2o.vh"

module tri_rlmlatch_p (vd, gd, clk, rst, act, force_t, thold_b, d_mode, sg, delay_lclkr, mpw1_b, mpw2_b, scin, din, scout, dout);
   parameter             INIT = 0;		// will be converted to the least signficant
                                                // 31 bits of init_v
   parameter             IBUF = 1'b0;		//inverted latch IOs, if set to true.
   parameter             DUALSCAN = "";		// if "S", marks data ports as scan for Moebius
   parameter             NEEDS_SRESET = 1;	// for inferred latches
   parameter             DOMAIN_CROSSING = 0;

   inout                        vd;
   inout                        gd;
   input                        clk;
   input                        rst;
   input                        act;		// 1: functional, 0: no clock
   input                        force_t;	// 1: force LCB active
   input                        thold_b;	// 1: functional, 0: no clock
   input                        d_mode;		// 1: disable pulse mode, 0: pulse mode
   input                        sg;		// 0: functional, 1: scan
   input                        delay_lclkr;	// 0: functional
   input                        mpw1_b;		// pulse width control bit
   input                        mpw2_b;		// pulse width control bit
   input                        scin;		// scan in
   input                        din;		// data in
   output                       scout;		// scan out
   output                       dout;		// data out

   parameter             WIDTH = 1;
   parameter [0:WIDTH-1] init_v = INIT;

   generate
     wire                  sreset;
     wire                  int_din;
     reg                   int_dout;
       (* analysis_not_referenced="true" *)
     wire                  unused;

     assign sreset = (NEEDS_SRESET == 1) ? rst : 0;

     assign int_din = IBUF ? ~din : din;

     always @(posedge clk) begin: l
       if (sreset)                              // reset value
         int_dout <= init_v[0];
       else if ((act | force_t) & thold_b)      // activate or force, and not clk off
         int_dout <= int_din;
     end

     assign dout = IBUF ? ~int_dout : int_dout;

     assign scout = 0;

     assign unused = d_mode | sg | delay_lclkr | mpw1_b | mpw2_b | scin;

   endgenerate
endmodule