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Verilog

2 years ago
// © 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
// Description: Prioritizer
//
//*****************************************************************************
module tri_agecmp(
a,
b,
a_newer_b
);
parameter SIZE = 8;
input [0:SIZE-1] a;
input [0:SIZE-1] b;
output a_newer_b;
// tri_agecmp
wire a_lt_b;
wire a_gte_b;
wire cmp_sel;
assign a_lt_b = (a[1:SIZE - 1] < b[1:SIZE - 1]) ? 1'b1 :
1'b0;
assign a_gte_b = (~a_lt_b);
assign cmp_sel = a[0] ~^ b[0];
assign a_newer_b = (a_lt_b & (~cmp_sel)) | (a_gte_b & cmp_sel);
endmodule