// ========== Copyright Header Begin ========================================== // // OpenSPARC T2 Processor File: niu_pio_scheduler64.v // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved // 4150 Network Circle, Santa Clara, California 95054, U.S.A. // // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; version 2 of the License. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA // // For the avoidance of doubt, and except that if any non-GPL license // choice is available it will apply instead, Sun elects to use only // the General Public License version 2 (GPLv2) at this time for any // software where a choice of GPL license versions is made // available with the language indicating that GPLv2 or any later version // may be used, or where a choice of which version of the GPL is applied is // otherwise unspecified. // // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, // CA 95054 USA or visit www.sun.com if you need additional information or // have any questions. // // ========== Copyright Header End ============================================ /*%W% %G%*/ /*************************************************************** * * File Name : niu_pio_scheduler64.v * Author Name : John Lo * Description : This file is copy from Vega ibtp scheduler64.v. * It includes three major part of * fuctions: * 1. req_mux which is composed from req_mux.c code. * 2. daisy_chain which is a priority * daisy chain nor gates. * It is composed from daisy_chain.c code. * 3. encoder which is composed from encoder.c code. * Parent Module: niu_pio_ic * Child Module: * Interface Mod: * Date Created : 6/17/02 * * Copyright (c) 2008, Sun Microsystems, Inc. * Sun Proprietary and Confidential * * Modification : * * Synthesis Notes: There is a multicycle path of 2 * from gnt[63:0] to result_qpn[5:0]. * * **************************************************************/ module niu_pio_scheduler64 ( clk, reset, intr_req_group, intr_rel_group, activate_ig_sm, activate_ig_sm_rel, activate_ig_sm_rel_latched, latch_req_mux_out, latch_result_group, latch_nx_pri_group, // output group ); input clk; input reset; input [63:0] intr_req_group; input [63:0] intr_rel_group; input latch_req_mux_out; input activate_ig_sm; input activate_ig_sm_rel; input activate_ig_sm_rel_latched; input latch_result_group; input latch_nx_pri_group; // output output [5:0] group; reg [63:0] del_intr_rel_group; wire [63:0] intr_req_group; wire [63:0] mux_input; wire [63:0] req_mux_dout; wire [63:0] req_mux_dout_reg; wire [63:0] gnt; // wire [63:0] gnt_reg; wire [5:0] gnt_num; wire [5:0] group; wire [5:0] result_group; wire [5:0] pri_group_1; wire [5:0] pri_group_2; wire [5:0] nx_pri_group; always @ (posedge clk) begin if (reset) del_intr_rel_group <= 64'b0 ; else begin if (activate_ig_sm_rel) del_intr_rel_group <= intr_rel_group ; else del_intr_rel_group <= del_intr_rel_group; end end assign mux_input[63:0] = ((activate_ig_sm)?intr_req_group:((activate_ig_sm_rel_latched)?del_intr_rel_group:64'b0)) ; reg [63:0] mux_input_del ; reg latch_req_mux_out_del ; reg latch_result_group_del ; reg latch_nx_pri_group_del ; always @ (posedge clk) begin if (reset) begin mux_input_del <= 64'b0 ; latch_req_mux_out_del <= 1'b0 ; latch_result_group_del <= 1'b0 ; latch_nx_pri_group_del <= 1'b0 ; end else begin mux_input_del <= mux_input ; latch_req_mux_out_del <= latch_req_mux_out ; latch_result_group_del <= latch_result_group ; latch_nx_pri_group_del <= latch_nx_pri_group ; end end niu_req_mux req_mux(.req_mux_din(mux_input_del), .sel_1(pri_group_1), .sel_2(pri_group_2), .req_mux_dout(req_mux_dout)); dffre #(64) req_mux_dout_reg_dffre( .clk(clk), .reset(reset), .en(latch_req_mux_out_del), .d(req_mux_dout), .q(req_mux_dout_reg)); niu_daisy_chain daisy_chain(.req_mux_dout(req_mux_dout_reg), .gnt(gnt)); niu_gnt_encoder gnt_encoder(.gnt(gnt),.gnt_num(gnt_num)); assign result_group = gnt_num + pri_group_1; dffre #(6) group_dffre (.clk(clk),.reset(reset), .en(latch_result_group_del), .d(result_group), .q(group)); assign nx_pri_group = group + 1; dffre #(6) pri_group_dffre_1(.clk(clk),.reset(reset), .en(latch_nx_pri_group_del), .d(nx_pri_group), .q(pri_group_1)); dffre #(6) pri_group_dffre_2 (.clk(clk),.reset(reset), .en(latch_nx_pri_group_del), .d(nx_pri_group), .q(pri_group_2)); endmodule // niu_pio_scheduler64