Subversion Repositories s1_core

// ========== 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