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[/] [openrisc/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_lsu.v] - Rev 30
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////////////////////////////////////////////////////////////////////// //// //// //// OR1200's Load/Store unit //// //// //// //// This file is part of the OpenRISC 1200 project //// //// http://www.opencores.org/cores/or1k/ //// //// //// //// Description //// //// Interface between CPU and DC. //// //// //// //// To Do: //// //// - make it smaller and faster //// //// //// //// Author(s): //// //// - Damjan Lampret, lampret@opencores.org //// //// //// ////////////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2000 Authors and OPENCORES.ORG //// //// //// //// This source file may be used and distributed without //// //// restriction provided that this copyright statement is not //// //// removed from the file and that any derivative work contains //// //// the original copyright notice and the associated disclaimer. //// //// //// //// This source file is free software; you can redistribute it //// //// and/or modify it under the terms of the GNU Lesser General //// //// Public License as published by the Free Software Foundation; //// //// either version 2.1 of the License, or (at your option) any //// //// later version. //// //// //// //// This source 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 Lesser General Public License for more //// //// details. //// //// //// //// You should have received a copy of the GNU Lesser General //// //// Public License along with this source; if not, download it //// //// from http://www.opencores.org/lgpl.shtml //// //// //// ////////////////////////////////////////////////////////////////////// // // CVS Revision History // // $Log: not supported by cvs2svn $ // Revision 1.4 2002/03/29 15:16:56 lampret // Some of the warnings fixed. // // Revision 1.3 2002/02/11 04:33:17 lampret // Speed optimizations (removed duplicate _cyc_ and _stb_). Fixed D/IMMU cache-inhibit attr. // // Revision 1.2 2002/01/18 07:56:00 lampret // No more low/high priority interrupts (PICPR removed). Added tick timer exception. Added exception prefix (SR[EPH]). Fixed single-step bug whenreading NPC. // // Revision 1.1 2002/01/03 08:16:15 lampret // New prefixes for RTL files, prefixed module names. Updated cache controllers and MMUs. // // Revision 1.9 2001/11/30 18:59:47 simons // *** empty log message *** // // Revision 1.8 2001/10/21 17:57:16 lampret // Removed params from generic_XX.v. Added translate_off/on in sprs.v and id.v. Removed spr_addr from dc.v and ic.v. Fixed CR+LF. // // Revision 1.7 2001/10/14 13:12:09 lampret // MP3 version. // // Revision 1.1.1.1 2001/10/06 10:18:36 igorm // no message // // Revision 1.2 2001/08/09 13:39:33 lampret // Major clean-up. // // Revision 1.1 2001/07/20 00:46:03 lampret // Development version of RTL. Libraries are missing. // // // synopsys translate_off `include "timescale.v" // synopsys translate_on `include "or1200_defines.v" module or1200_lsu( // Internal i/f addrbase, addrofs, lsu_op, lsu_datain, lsu_dataout, lsu_stall, lsu_unstall, du_stall, except_align, except_dtlbmiss, except_dmmufault, except_dbuserr, // External i/f to DC dcpu_adr_o, dcpu_cycstb_o, dcpu_we_o, dcpu_sel_o, dcpu_tag_o, dcpu_dat_o, dcpu_dat_i, dcpu_ack_i, dcpu_rty_i, dcpu_err_i, dcpu_tag_i ); parameter dw = `OR1200_OPERAND_WIDTH; parameter aw = `OR1200_REGFILE_ADDR_WIDTH; // // I/O // // // Internal i/f // input [31:0] addrbase; input [31:0] addrofs; input [`OR1200_LSUOP_WIDTH-1:0] lsu_op; input [dw-1:0] lsu_datain; output [dw-1:0] lsu_dataout; output lsu_stall; output lsu_unstall; input du_stall; output except_align; output except_dtlbmiss; output except_dmmufault; output except_dbuserr; // // External i/f to DC // output [31:0] dcpu_adr_o; output dcpu_cycstb_o; output dcpu_we_o; output [3:0] dcpu_sel_o; output [3:0] dcpu_tag_o; output [31:0] dcpu_dat_o; input [31:0] dcpu_dat_i; input dcpu_ack_i; input dcpu_rty_i; input dcpu_err_i; input [3:0] dcpu_tag_i; // // Internal wires/regs // reg [3:0] dcpu_sel_o; // // Internal I/F assignments // assign lsu_stall = dcpu_rty_i & dcpu_cycstb_o; assign lsu_unstall = dcpu_ack_i; assign except_align = ((lsu_op == `OR1200_LSUOP_SH) | (lsu_op == `OR1200_LSUOP_LHZ) | (lsu_op == `OR1200_LSUOP_LHS)) & dcpu_adr_o[0] | ((lsu_op == `OR1200_LSUOP_SW) | (lsu_op == `OR1200_LSUOP_LWZ) | (lsu_op == `OR1200_LSUOP_LWS)) & |dcpu_adr_o[1:0]; assign except_dtlbmiss = dcpu_err_i & (dcpu_tag_i == `OR1200_DTAG_TE); assign except_dmmufault = dcpu_err_i & (dcpu_tag_i == `OR1200_DTAG_PE); assign except_dbuserr = dcpu_err_i & (dcpu_tag_i == `OR1200_DTAG_BE); // // External I/F assignments // assign dcpu_adr_o = addrbase + addrofs; assign dcpu_cycstb_o = du_stall | lsu_unstall | except_align ? 1'b0 : |lsu_op; assign dcpu_we_o = lsu_op[3]; assign dcpu_tag_o = dcpu_cycstb_o ? `OR1200_DTAG_ND : `OR1200_DTAG_IDLE; always @(lsu_op or dcpu_adr_o) casex({lsu_op, dcpu_adr_o[1:0]}) {`OR1200_LSUOP_SB, 2'b00} : dcpu_sel_o = 4'b1000; {`OR1200_LSUOP_SB, 2'b01} : dcpu_sel_o = 4'b0100; {`OR1200_LSUOP_SB, 2'b10} : dcpu_sel_o = 4'b0010; {`OR1200_LSUOP_SB, 2'b11} : dcpu_sel_o = 4'b0001; {`OR1200_LSUOP_SH, 2'b00} : dcpu_sel_o = 4'b1100; {`OR1200_LSUOP_SH, 2'b10} : dcpu_sel_o = 4'b0011; {`OR1200_LSUOP_SW, 2'b00} : dcpu_sel_o = 4'b1111; {`OR1200_LSUOP_LBZ, 2'b00}, {`OR1200_LSUOP_LBS, 2'b00} : dcpu_sel_o = 4'b1000; {`OR1200_LSUOP_LBZ, 2'b01}, {`OR1200_LSUOP_LBS, 2'b01} : dcpu_sel_o = 4'b0100; {`OR1200_LSUOP_LBZ, 2'b10}, {`OR1200_LSUOP_LBS, 2'b10} : dcpu_sel_o = 4'b0010; {`OR1200_LSUOP_LBZ, 2'b11}, {`OR1200_LSUOP_LBS, 2'b11} : dcpu_sel_o = 4'b0001; {`OR1200_LSUOP_LHZ, 2'b00}, {`OR1200_LSUOP_LHS, 2'b00} : dcpu_sel_o = 4'b1100; {`OR1200_LSUOP_LHZ, 2'b10}, {`OR1200_LSUOP_LHS, 2'b10} : dcpu_sel_o = 4'b0011; {`OR1200_LSUOP_LWZ, 2'b00}, {`OR1200_LSUOP_LWS, 2'b00} : dcpu_sel_o = 4'b1111; default : dcpu_sel_o = 4'b0000; endcase // // Instantiation of Memory-to-regfile aligner // or1200_mem2reg or1200_mem2reg( .addr(dcpu_adr_o[1:0]), .lsu_op(lsu_op), .memdata(dcpu_dat_i), .regdata(lsu_dataout) ); // // Instantiation of Regfile-to-memory aligner // or1200_reg2mem or1200_reg2mem( .addr(dcpu_adr_o[1:0]), .lsu_op(lsu_op), .regdata(lsu_datain), .memdata(dcpu_dat_o) ); endmodule
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