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[/] [openrisc/] [trunk/] [orpsocv2/] [rtl/] [verilog/] [or1200/] [or1200_ic_top.v] - Rev 475
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////////////////////////////////////////////////////////////////////// //// //// //// OR1200's Instruction Cache top level //// //// //// //// This file is part of the OpenRISC 1200 project //// //// http://opencores.org/project,or1k //// //// //// //// Description //// //// Instantiation of all IC 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 //// //// //// ////////////////////////////////////////////////////////////////////// // // $Log: or1200_ic_top.v,v $ // Revision 2.0 2010/06/30 11:00:00 ORSoC // No update // synopsys translate_off `include "timescale.v" // synopsys translate_on `include "or1200_defines.v" // // Instruction cache top // module or1200_ic_top( // Rst, clk and clock control clk, rst, // External i/f icbiu_dat_o, icbiu_adr_o, icbiu_cyc_o, icbiu_stb_o, icbiu_we_o, icbiu_sel_o, icbiu_cab_o, icbiu_dat_i, icbiu_ack_i, icbiu_err_i, // Internal i/f ic_en, icqmem_adr_i, icqmem_cycstb_i, icqmem_ci_i, icqmem_sel_i, icqmem_tag_i, icqmem_dat_o, icqmem_ack_o, icqmem_rty_o, icqmem_err_o, icqmem_tag_o, `ifdef OR1200_BIST // RAM BIST mbist_si_i, mbist_so_o, mbist_ctrl_i, `endif // 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] icbiu_dat_o; output [31:0] icbiu_adr_o; output icbiu_cyc_o; output icbiu_stb_o; output icbiu_we_o; output [3:0] icbiu_sel_o; output icbiu_cab_o; input [dw-1:0] icbiu_dat_i; input icbiu_ack_i; input icbiu_err_i; // // Internal I/F // input ic_en; input [31:0] icqmem_adr_i; input icqmem_cycstb_i; input icqmem_ci_i; input [3:0] icqmem_sel_i; input [3:0] icqmem_tag_i; output [dw-1:0] icqmem_dat_o; output icqmem_ack_o; output icqmem_rty_o; output icqmem_err_o; output [3:0] icqmem_tag_o; `ifdef OR1200_BIST // // RAM BIST // input mbist_si_i; input [`OR1200_MBIST_CTRL_WIDTH - 1:0] mbist_ctrl_i; output mbist_so_o; `endif // // SPR access // input spr_cs; input spr_write; input [31:0] spr_dat_i; // // Internal wires and regs // wire tag_v; wire [`OR1200_ICTAG_W-2:0] tag; wire [dw-1:0] to_icram; wire [dw-1:0] from_icram; wire [31:0] saved_addr; wire [3:0] icram_we; wire ictag_we; wire [31:0] ic_addr; wire icfsm_biu_read; /* verilator lint_off UNOPTFLAT */ reg tagcomp_miss; /* verilator lint_on UNOPTFLAT */ wire [`OR1200_ICINDXH:`OR1200_ICLS] ictag_addr; wire ictag_en; wire ictag_v; wire ic_inv; wire icfsm_first_hit_ack; wire icfsm_first_miss_ack; wire icfsm_first_miss_err; wire icfsm_burst; wire icfsm_tag_we; reg ic_inv_q; `ifdef OR1200_BIST // // RAM BIST // wire mbist_ram_so; wire mbist_tag_so; wire mbist_ram_si = mbist_si_i; wire mbist_tag_si = mbist_ram_so; assign mbist_so_o = mbist_tag_so; `endif // // Simple assignments // assign icbiu_adr_o = ic_addr; assign ic_inv = spr_cs & spr_write; assign ictag_we = icfsm_tag_we | ic_inv; assign ictag_addr = ic_inv ? spr_dat_i[`OR1200_ICINDXH:`OR1200_ICLS] : ic_addr[`OR1200_ICINDXH:`OR1200_ICLS]; assign ictag_en = ic_inv | ic_en; assign ictag_v = ~ic_inv; // // Data to BIU is from ICRAM when IC is enabled or from LSU when // IC is disabled // assign icbiu_dat_o = 32'h00000000; // // Bypases of the IC when IC is disabled // assign icbiu_cyc_o = (ic_en) ? icfsm_biu_read : icqmem_cycstb_i; assign icbiu_stb_o = (ic_en) ? icfsm_biu_read : icqmem_cycstb_i; assign icbiu_we_o = 1'b0; assign icbiu_sel_o = (ic_en & icfsm_biu_read) ? 4'b1111 : icqmem_sel_i; assign icbiu_cab_o = (ic_en) ? icfsm_burst : 1'b0; assign icqmem_rty_o = ~icqmem_ack_o & ~icqmem_err_o; assign icqmem_tag_o = icqmem_err_o ? `OR1200_ITAG_BE : icqmem_tag_i; // // CPU normal and error termination // assign icqmem_ack_o = ic_en ? (icfsm_first_hit_ack | icfsm_first_miss_ack) : icbiu_ack_i; assign icqmem_err_o = ic_en ? icfsm_first_miss_err : icbiu_err_i; // // Select between claddr generated by IC FSM and addr[3:2] generated by LSU // assign ic_addr = (icfsm_biu_read) ? saved_addr : icqmem_adr_i; // // Select between input data generated by LSU or by BIU // assign to_icram = icbiu_dat_i; // // Select between data generated by ICRAM or passed by BIU // assign icqmem_dat_o = icfsm_first_miss_ack | !ic_en ? icbiu_dat_i : from_icram; // // Detect falling edge of IC invalidate signal // always @(posedge clk or `OR1200_RST_EVENT rst) if (rst==`OR1200_RST_VALUE) ic_inv_q <= 1'b0; else ic_inv_q <= ic_inv; // // Tag comparison // // During line invalidate, ensure it stays the same always @(tag or saved_addr or tag_v) begin if ((tag != saved_addr[31:`OR1200_ICTAGL]) | !tag_v) tagcomp_miss = 1'b1; else tagcomp_miss = 1'b0; end // // Instantiation of IC Finite State Machine // or1200_ic_fsm or1200_ic_fsm( .clk(clk), .rst(rst), .ic_en(ic_en), .icqmem_cycstb_i(icqmem_cycstb_i), .icqmem_ci_i(icqmem_ci_i), .tagcomp_miss(tagcomp_miss), .biudata_valid(icbiu_ack_i), .biudata_error(icbiu_err_i), .start_addr(icqmem_adr_i), .saved_addr(saved_addr), .icram_we(icram_we), .biu_read(icfsm_biu_read), .first_hit_ack(icfsm_first_hit_ack), .first_miss_ack(icfsm_first_miss_ack), .first_miss_err(icfsm_first_miss_err), .burst(icfsm_burst), .tag_we(icfsm_tag_we) ); // // Instantiation of IC main memory // or1200_ic_ram or1200_ic_ram( .clk(clk), .rst(rst), `ifdef OR1200_BIST // RAM BIST .mbist_si_i(mbist_ram_si), .mbist_so_o(mbist_ram_so), .mbist_ctrl_i(mbist_ctrl_i), `endif .addr(ic_addr[`OR1200_ICINDXH:2]), .en(ic_en), .we(icram_we), .datain(to_icram), .dataout(from_icram) ); // // Instantiation of IC TAG memory // or1200_ic_tag or1200_ic_tag( .clk(clk), .rst(rst), `ifdef OR1200_BIST // RAM BIST .mbist_si_i(mbist_tag_si), .mbist_so_o(mbist_tag_so), .mbist_ctrl_i(mbist_ctrl_i), `endif .addr(ictag_addr), .en(ictag_en), .we(ictag_we), .datain({ic_addr[31:`OR1200_ICTAGL], ictag_v}), .tag_v(tag_v), .tag(tag) ); endmodule
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