URL
https://opencores.org/ocsvn/or1k_old/or1k_old/trunk
Subversion Repositories or1k_old
[/] [or1k_old/] [trunk/] [or1200/] [rtl/] [verilog/] [or1200_dc_top.v] - Rev 660
Go to most recent revision | Compare with Previous | Blame | View Log
////////////////////////////////////////////////////////////////////// //// //// //// OR1200's Data Cache top level //// //// //// //// This file is part of the OpenRISC 1200 project //// //// http://www.opencores.org/cores/or1k/ //// //// //// //// Description //// //// Instantiation of all DC blocks. //// //// //// //// 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 1.3 2002/01/28 01:16:00 lampret // Changed 'void' nop-ops instead of insn[0] to use insn[16]. Debug unit stalls the tick timer. Prepared new flag generation for add and and insns. Blocked DC/IC while they are turned off. Fixed I/D MMU SPRs layout except WAYs. TODO: smart IC invalidate, l.j 2 and TLB ways. // // Revision 1.2 2002/01/14 06:18:22 lampret // Fixed mem2reg bug in FAST implementation. Updated debug unit to work with new genpc/if. // // Revision 1.1 2002/01/03 08:16:15 lampret // New prefixes for RTL files, prefixed module names. Updated cache controllers and MMUs. // // Revision 1.10 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 1.9 2001/10/14 13:12:09 lampret // MP3 version. // // Revision 1.1.1.1 2001/10/06 10:18:35 igorm // no message // // Revision 1.4 2001/08/13 03:36:20 lampret // Added cfg regs. Moved all defines into one defines.v file. More cleanup. // // Revision 1.3 2001/08/09 13:39:33 lampret // Major clean-up. // // Revision 1.2 2001/07/22 03:31:53 lampret // Fixed RAM's oen bug. Cache bypass under development. // // 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" // // Data cache // module or1200_dc_top( // Rst, clk and clock control clk, rst, // External i/f dcbiu_dat_o, dcbiu_adr_o, dcbiu_cyc_o, dcbiu_stb_o, dcbiu_we_o, dcbiu_sel_o, dcbiu_cab_o, dcbiu_dat_i, dcbiu_ack_i, dcbiu_err_i, // Internal i/f dc_en, dcdmmu_adr_i, dcdmmu_cycstb_i, dcdmmu_ci_i, dcpu_we_i, dcpu_sel_i, dcpu_tag_i, dcpu_dat_i, dcpu_dat_o, dcpu_ack_o, dcpu_rty_o, dcdmmu_err_o, dcdmmu_tag_o, // SPRs spr_cs, spr_write, spr_dat_i ); parameter dw = `OR1200_OPERAND_WIDTH; // // I/O // // // Clock and reset // input clk; input rst; // // External I/F // output [dw-1:0] dcbiu_dat_o; output [31:0] dcbiu_adr_o; output dcbiu_cyc_o; output dcbiu_stb_o; output dcbiu_we_o; output [3:0] dcbiu_sel_o; output dcbiu_cab_o; input [dw-1:0] dcbiu_dat_i; input dcbiu_ack_i; input dcbiu_err_i; // // Internal I/F // input dc_en; input [31:0] dcdmmu_adr_i; input dcdmmu_cycstb_i; input dcdmmu_ci_i; input dcpu_we_i; input [3:0] dcpu_sel_i; input [3:0] dcpu_tag_i; input [dw-1:0] dcpu_dat_i; output [dw-1:0] dcpu_dat_o; output dcpu_ack_o; output dcpu_rty_o; output dcdmmu_err_o; output [3:0] dcdmmu_tag_o; // // SPR access // input spr_cs; input spr_write; input [31:0] spr_dat_i; // // Internal wires and regs // wire tag_v; wire [`OR1200_DCTAG_W-2:0] tag; wire [dw-1:0] to_dcram; wire [dw-1:0] from_dcram; wire [31:0] saved_addr; wire [3:0] dcram_we; wire dctag_we; wire [31:0] dc_addr; wire dcfsm_biu_read; wire dcfsm_biu_write; reg tagcomp_miss; wire [`OR1200_DCINDXH:`OR1200_DCLS] dctag_addr; wire dctag_en; wire dctag_v; wire dc_inv; wire dcfsm_first_hit_ack; wire dcfsm_first_miss_ack; wire dcfsm_first_miss_err; wire dcfsm_burst; wire dcfsm_tag_we; // // Simple assignments // assign dcbiu_adr_o = dc_addr; assign dc_inv = spr_cs & spr_write; assign dctag_we = dcfsm_tag_we | dc_inv; assign dctag_addr = dc_inv ? spr_dat_i[`OR1200_DCINDXH:`OR1200_DCLS] : dc_addr[`OR1200_DCINDXH:`OR1200_DCLS]; assign dctag_en = dc_inv | dc_en; assign dctag_v = ~dc_inv; // // Data to BIU is from DCRAM when DC is enabled or from LSU when // DC is disabled // assign dcbiu_dat_o = dcpu_dat_i; // // Bypases of the DC when DC is disabled // assign dcbiu_cyc_o = (dc_en) ? dcfsm_biu_read | dcfsm_biu_write : dcdmmu_cycstb_i; assign dcbiu_stb_o = (dc_en) ? dcfsm_biu_read | dcfsm_biu_write : dcdmmu_cycstb_i; assign dcbiu_we_o = (dc_en) ? dcfsm_biu_write : dcpu_we_i; assign dcbiu_sel_o = (dc_en & dcfsm_biu_read & !dcfsm_biu_write & !dcdmmu_ci_i) ? 4'b1111 : dcpu_sel_i; assign dcbiu_cab_o = (dc_en) ? dcfsm_burst : 1'b0; assign dcpu_rty_o = ~dcpu_ack_o; assign dcdmmu_tag_o = dcdmmu_err_o ? `OR1200_DTAG_BE : dcpu_tag_i; // // DC/LSU normal and error termination // assign dcpu_ack_o = dc_en ? dcfsm_first_hit_ack | dcfsm_first_miss_ack : dcbiu_ack_i; assign dcdmmu_err_o = dc_en ? dcfsm_first_miss_err : dcbiu_err_i; // // Select between claddr generated by DC FSM and addr[3:2] generated by LSU // //assign dc_addr = (dcfsm_biu_read | dcfsm_biu_write) ? saved_addr : dcdmmu_adr_i; // // Select between input data generated by LSU or by BIU // assign to_dcram = (dcfsm_biu_read) ? dcbiu_dat_i : dcpu_dat_i; // // Select between data generated by DCRAM or passed by BIU // assign dcpu_dat_o = dcfsm_first_miss_ack | !dc_en ? dcbiu_dat_i : from_dcram; // // Tag comparison // always @(tag or saved_addr or tag_v) begin if ((tag != saved_addr[31:`OR1200_DCTAGL]) || !tag_v) tagcomp_miss = 1'b1; else tagcomp_miss = 1'b0; end // // Instantiation of DC Finite State Machine // or1200_dc_fsm or1200_dc_fsm( .clk(clk), .rst(rst), .dc_en(dc_en), .dcdmmu_cycstb_i(dcdmmu_cycstb_i), .dcdmmu_ci_i(dcdmmu_ci_i), .dcpu_we_i(dcpu_we_i), .dcpu_sel_i(dcpu_sel_i), .tagcomp_miss(tagcomp_miss), .biudata_valid(dcbiu_ack_i), .biudata_error(dcbiu_err_i), .start_addr(dcdmmu_adr_i), .saved_addr(saved_addr), .dcram_we(dcram_we), .biu_read(dcfsm_biu_read), .biu_write(dcfsm_biu_write), .first_hit_ack(dcfsm_first_hit_ack), .first_miss_ack(dcfsm_first_miss_ack), .first_miss_err(dcfsm_first_miss_err), .burst(dcfsm_burst), .tag_we(dcfsm_tag_we), .dc_addr(dc_addr) ); // // Instantiation of DC main memory // or1200_dc_ram or1200_dc_ram( .clk(clk), .rst(rst), .addr(dc_addr[`OR1200_DCINDXH:2]), .en(dc_en), .we(dcram_we), .datain(to_dcram), .dataout(from_dcram) ); // // Instantiation of DC TAG memory // or1200_dc_tag or1200_dc_tag( .clk(clk), .rst(rst), .addr(dctag_addr), .en(dctag_en), .we(dctag_we), .datain({dc_addr[31:`OR1200_DCTAGL], dctag_v}), .tag_v(tag_v), .tag(tag) ); endmodule
Go to most recent revision | Compare with Previous | Blame | View Log