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Verilog

// © IBM Corp. 2020
// 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_nand2_nlats.v
// *! DESCRIPTION : n-bit scannable m/s latch, for bit stacking, with nand2 gate in front
// *!****************************************************************
`include "tri_a2o.vh"
module tri_nand2_nlats(
vd,
gd,
lclk,
d1clk,
d2clk,
scanin,
scanout,
a1,
a2,
qb
);
parameter OFFSET = 0;
parameter WIDTH = 1;
parameter INIT = 0;
parameter L2_LATCH_TYPE = 2; //L2_LATCH_TYPE = slave_latch;
//0=master_latch,1=L1,2=slave_latch,3=L2,4=flush_latch,5=L4
parameter SYNTHCLONEDLATCH = "";
parameter BTR = "NLA0001_X1_A12TH";
parameter NEEDS_SRESET = 1; // for inferred latches
inout vd;
inout gd;
input [0:`NCLK_WIDTH-1] lclk;
input d1clk;
input d2clk;
input [OFFSET:OFFSET+WIDTH-1] scanin;
output [OFFSET:OFFSET+WIDTH-1] scanout;
input [OFFSET:OFFSET+WIDTH-1] a1;
input [OFFSET:OFFSET+WIDTH-1] a2;
output [OFFSET:OFFSET+WIDTH-1] qb;
// tri_nand2_nlats
parameter [0:WIDTH-1] init_v = INIT;
parameter [0:WIDTH-1] ZEROS = {WIDTH{1'b0}};
generate
wire sreset;
wire [0:WIDTH-1] int_din;
reg [0:WIDTH-1] int_dout;
wire [0:WIDTH-1] vact;
wire [0:WIDTH-1] vact_b;
wire [0:WIDTH-1] vsreset;
wire [0:WIDTH-1] vsreset_b;
wire [0:WIDTH-1] vthold;
wire [0:WIDTH-1] vthold_b;
wire [0:WIDTH-1] din;
(* analysis_not_referenced="true" *)
wire unused;
if (NEEDS_SRESET == 1)
begin : rst
assign sreset = lclk[1];
end
if (NEEDS_SRESET != 1)
begin : no_rst
assign sreset = 1'b0;
end
assign vsreset = {WIDTH{sreset}};
assign vsreset_b = {WIDTH{~sreset}};
assign din = a1 & a2; // Output is inverted, so just AND2 here
assign int_din = (vsreset_b & din) | (vsreset & init_v);
assign vact = {WIDTH{d1clk}};
assign vact_b = {WIDTH{~d1clk}};
assign vthold_b = {WIDTH{d2clk}};
assign vthold = {WIDTH{~d2clk}};
always @(posedge lclk[0]) begin: l
//int_dout <= (((vact & vthold_b) | vsreset) & int_din) | (((vact_b | vthold) & vsreset_b) & int_dout);
if (sreset)
int_dout <= int_din;
else if (d1clk & d2clk)
int_dout <= int_din;
end
assign qb = (~int_dout);
assign scanout = ZEROS;
assign unused = | {vd, gd, lclk, scanin};
endgenerate
endmodule