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[/] [s1_core/] [trunk/] [hdl/] [rtl/] [sparc_core/] [tlu_prencoder16.v] - Rev 95
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// ========== Copyright Header Begin ========================================== // // OpenSPARC T1 Processor File: tlu_prencoder16.v // Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. // // The above named program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public // License version 2 as published by the Free Software Foundation. // // The above named 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 work; if not, write to the Free Software // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. // // ========== Copyright Header End ============================================ //////////////////////////////////////////////////////////////////////// /* // Description: Datapath Priority Encoder 16b // - 15b multihot vector as input // - 15b 1-hit vector as output // - Can use some std length such as 16b // - msb is given highest priority */ //////////////////////////////////////////////////////////////////////// // Global header file includes //////////////////////////////////////////////////////////////////////// // system level definition file which contains the/* /* ========== Copyright Header Begin ========================================== * * OpenSPARC T1 Processor File: sys.h * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES. * * The above named program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License version 2 as published by the Free Software Foundation. * * The above named 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 work; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. * * ========== Copyright Header End ============================================ */ // -*- verilog -*- //////////////////////////////////////////////////////////////////////// /* // // Description: Global header file that contain definitions that // are common/shared at the systme level */ //////////////////////////////////////////////////////////////////////// // // Setting the time scale // If the timescale changes, JP_TIMESCALE may also have to change. `timescale 1ps/1ps // // JBUS clock // ========= // // Afara Link Defines // ================== // Reliable Link // Afara Link Objects // Afara Link Object Format - Reliable Link // Afara Link Object Format - Congestion // Afara Link Object Format - Acknowledge // Afara Link Object Format - Request // Afara Link Object Format - Message // Acknowledge Types // Request Types // Afara Link Frame // // UCB Packet Type // =============== // // // UCB Data Packet Format // ====================== // // Size encoding for the UCB_SIZE_HI/LO field // 000 - byte // 001 - half-word // 010 - word // 011 - double-word // 111 - quad-word // // UCB Interrupt Packet Format // =========================== // //`define UCB_THR_HI 9 // (6) cpu/thread ID shared with //`define UCB_THR_LO 4 data packet format //`define UCB_PKT_HI 3 // (4) packet type shared with //`define UCB_PKT_LO 0 // data packet format // // FCRAM Bus Widths // ================ // // // ENET clock periods // ================== // // // JBus Bridge defines // ================= // // // PCI Device Address Configuration // ================================ // // time scale definition //////////////////////////////////////////////////////////////////////// // Local header file includes / local defines //////////////////////////////////////////////////////////////////////// module tlu_prencoder16 (din, dout); input [14:0] din ; output [3:0] dout ; wire [14:0] onehot ; assign onehot[14] = din[14] ; assign onehot[13] = din[13] & ~din[14] ; assign onehot[12] = din[12] & ~(|din[14:13]) ; assign onehot[11] = din[11] & ~(|din[14:12]) ; assign onehot[10] = din[10] & ~(|din[14:11]) ; assign onehot[9] = din[9] & ~(|din[14:10]) ; assign onehot[8] = din[8] & ~(|din[14:9]) ; assign onehot[7] = din[7] & ~(|din[14:8]) ; assign onehot[6] = din[6] & ~(|din[14:7]) ; assign onehot[5] = din[5] & ~(|din[14:6]) ; assign onehot[4] = din[4] & ~(|din[14:5]) ; assign onehot[3] = din[3] & ~(|din[14:4]) ; assign onehot[2] = din[2] & ~(|din[14:3]) ; assign onehot[1] = din[1] & ~(|din[14:2]) ; assign onehot[0] = din[0] & ~(|din[14:1]) ; //assign onehot[0] = din[0] & ~(|din[15:1]) ; assign dout[3] = |onehot[14:7] ; assign dout[2] = (|onehot[6:3]) | (|onehot[14:11]) ; assign dout[1] = (|onehot[2:1]) | (|onehot[6:5]) | (|onehot[10:9]) | (|onehot[14:13]) ; assign dout[0] = onehot[0] | onehot[2] | onehot[4] | onehot[6] | onehot[8] | onehot[10] | onehot[12] | onehot[14] ; endmodule
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