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[/] [sparc64soc/] [trunk/] [T1-CPU/] [tlu/] [tlu_prencoder16.v] - Rev 7
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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 //////////////////////////////////////////////////////////////////////// `include "sys.h" // system level definition file which contains the // 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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