| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: dmu_common_ccc_dep.v |
| 4 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved |
| 5 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. |
| 6 | // |
| 7 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 8 | // |
| 9 | // This program is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; version 2 of the License. |
| 12 | // |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | // |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | // |
| 22 | // For the avoidance of doubt, and except that if any non-GPL license |
| 23 | // choice is available it will apply instead, Sun elects to use only |
| 24 | // the General Public License version 2 (GPLv2) at this time for any |
| 25 | // software where a choice of GPL license versions is made |
| 26 | // available with the language indicating that GPLv2 or any later version |
| 27 | // may be used, or where a choice of which version of the GPL is applied is |
| 28 | // otherwise unspecified. |
| 29 | // |
| 30 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 31 | // CA 95054 USA or visit www.sun.com if you need additional information or |
| 32 | // have any questions. |
| 33 | // |
| 34 | // ========== Copyright Header End ============================================ |
| 35 | module dmu_common_ccc_dep |
| 36 | ( |
| 37 | clk, |
| 38 | rst_l, |
| 39 | |
| 40 | csr_ring_in, |
| 41 | |
| 42 | dep2cdp_data, |
| 43 | |
| 44 | dep2fsm_acc_vio, |
| 45 | dep2fsm_done, |
| 46 | dep2fsm_mapped, |
| 47 | dep2fsm_valid |
| 48 | ); |
| 49 | |
| 50 | // ---------------------------------------------------------------------------- |
| 51 | // Parameters |
| 52 | // ---------------------------------------------------------------------------- |
| 53 | parameter IDLE = 2'b00, |
| 54 | RDMS = 2'b01, |
| 55 | RDLS = 2'b10, |
| 56 | DONE = 2'b11; |
| 57 | |
| 58 | // ---------------------------------------------------------------------------- |
| 59 | // Ports |
| 60 | // ---------------------------------------------------------------------------- |
| 61 | input clk; |
| 62 | input rst_l; |
| 63 | |
| 64 | input [`FIRE_CSR_RING_BITS] csr_ring_in; |
| 65 | |
| 66 | output [`FIRE_CSR_DATA_BITS] dep2cdp_data; |
| 67 | |
| 68 | output dep2fsm_acc_vio; |
| 69 | output dep2fsm_done; |
| 70 | output dep2fsm_mapped; |
| 71 | output dep2fsm_valid; |
| 72 | |
| 73 | // ---------------------------------------------------------------------------- |
| 74 | // Variables |
| 75 | // ---------------------------------------------------------------------------- |
| 76 | wire [`FIRE_CSR_DATA_BITS] dep2cdp_data; |
| 77 | reg dep2fsm_acc_vio, nxt_vio; |
| 78 | reg dep2fsm_done, nxt_dne; |
| 79 | reg dep2fsm_mapped, nxt_map; |
| 80 | reg dep2fsm_valid, nxt_vld; |
| 81 | |
| 82 | reg [`FIRE_CSR_CMND_BITS] cmnd; |
| 83 | reg [`FIRE_CSR_DATA_BITS] data; |
| 84 | reg [1:0] state, nxt_state; |
| 85 | reg [1:0] data_ld; |
| 86 | reg cmnd_ld; |
| 87 | |
| 88 | // ---------------------------------------------------------------------------- |
| 89 | // Zero In Checkers |
| 90 | // ---------------------------------------------------------------------------- |
| 91 | |
| 92 | // ---------------------------------------------------------------------------- |
| 93 | // Combinational |
| 94 | // ---------------------------------------------------------------------------- |
| 95 | // output data |
| 96 | assign dep2cdp_data = data; |
| 97 | |
| 98 | // valid command |
| 99 | wire vld_cmnd = |csr_ring_in[`FIRE_CSR_RING_CMND_BITS]; |
| 100 | |
| 101 | // next state |
| 102 | always @ (state or vld_cmnd) begin |
| 103 | case (state) // synopsys parallel_case |
| 104 | IDLE : begin |
| 105 | if (vld_cmnd) nxt_state = RDMS; |
| 106 | else nxt_state = IDLE; |
| 107 | end |
| 108 | RDMS : nxt_state = RDLS; |
| 109 | RDLS : nxt_state = IDLE; |
| 110 | DONE : nxt_state = IDLE; |
| 111 | endcase |
| 112 | end |
| 113 | |
| 114 | // state outputs |
| 115 | always @ (state or cmnd) begin |
| 116 | cmnd_ld = 0; |
| 117 | data_ld = 0; |
| 118 | nxt_dne = 0; |
| 119 | nxt_map = 0; |
| 120 | nxt_vio = 0; |
| 121 | nxt_vld = 0; |
| 122 | case (state) // synopsys parallel_case |
| 123 | IDLE : begin |
| 124 | cmnd_ld = 1'b1; |
| 125 | end |
| 126 | RDMS : begin |
| 127 | data_ld = 2'b10; |
| 128 | end |
| 129 | RDLS : begin |
| 130 | data_ld = 2'b01; |
| 131 | nxt_vld = 1'b1; |
| 132 | case (cmnd) // synopsys parallel_case |
| 133 | `FIRE_CSR_CMND_RRSP : begin |
| 134 | nxt_dne = 1'b1; |
| 135 | nxt_map = 1'b1; |
| 136 | nxt_vio = 0; |
| 137 | end |
| 138 | `FIRE_CSR_CMND_WRSP : begin |
| 139 | nxt_dne = 1'b1; |
| 140 | nxt_map = 1'b1; |
| 141 | nxt_vio = 0; |
| 142 | end |
| 143 | `FIRE_CSR_CMND_RERR : begin |
| 144 | nxt_dne = 1'b1; |
| 145 | nxt_map = 1'b1; |
| 146 | nxt_vio = 1'b1; |
| 147 | end |
| 148 | `FIRE_CSR_CMND_WERR : begin |
| 149 | nxt_dne = 1'b1; |
| 150 | nxt_map = 1'b1; |
| 151 | nxt_vio = 1'b1; |
| 152 | end |
| 153 | default : begin |
| 154 | nxt_dne = 0; |
| 155 | nxt_map = 0; |
| 156 | nxt_vio = 0; |
| 157 | end |
| 158 | endcase |
| 159 | end |
| 160 | DONE : begin |
| 161 | nxt_vld = 0; |
| 162 | end |
| 163 | endcase |
| 164 | end |
| 165 | |
| 166 | // ---------------------------------------------------------------------------- |
| 167 | // Sequential |
| 168 | // ---------------------------------------------------------------------------- |
| 169 | always @(posedge clk ) begin |
| 170 | if (!rst_l) begin |
| 171 | state <= IDLE; |
| 172 | end |
| 173 | else begin |
| 174 | state <= nxt_state; |
| 175 | end |
| 176 | end |
| 177 | |
| 178 | always @(posedge clk ) begin |
| 179 | dep2fsm_acc_vio <= nxt_vio; |
| 180 | dep2fsm_done <= nxt_dne; |
| 181 | dep2fsm_mapped <= nxt_map; |
| 182 | dep2fsm_valid <= nxt_vld; |
| 183 | end |
| 184 | |
| 185 | always @(posedge clk ) begin |
| 186 | if (cmnd_ld) cmnd <= csr_ring_in[`FIRE_CSR_RING_CMND_BITS]; |
| 187 | if (data_ld[1]) data[`FIRE_CSR_RDMS_BITS] <= csr_ring_in; |
| 188 | if (data_ld[0]) data[`FIRE_CSR_RDLS_BITS] <= csr_ring_in; |
| 189 | end |
| 190 | |
| 191 | endmodule // dmu_common_ccc_dep |