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//////////////////////////////////////////////////////////////////////

////                                                              ////

////  OR1200's Embedded Memory                                    ////

////                                                              ////

////  This file is part of the OpenRISC 1200 project              ////

////  http://www.opencores.org/cores/or1k/                        ////

////                                                              ////

////  Description                                                 ////

////  Embedded Memory               .                             ////

////                                                              ////

////  To Do:                                                      ////

////   - QMEM and IC/DC muxes can be removed except for cycstb    ////

////     (now are is there for easier debugging)                  ////

////   - currently arbitration is slow and stores take 2 clocks   ////

////     (final debugged version will be faster)                  ////

////                                                              ////

////  Author(s):                                                  ////

////      - Damjan Lampret, lampret@opencores.org                 ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2003 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: or1200_qmem_top.v,v $

// Revision 2.0  2010/06/30 11:00:00  ORSoC

// Minor update: 

// Coding style changed.

//

// Revision 1.3  2004/06/08 18:17:36  lampret

// Non-functional changes. Coding style fixes.

//

// Revision 1.2  2004/04/05 08:40:26  lampret

// Merged branch_qmem into main tree.

//

// Revision 1.1.2.4  2004/01/11 22:45:46  andreje

// Separate instruction and data QMEM decoders, QMEM acknowledge and byte-select added

//

// Revision 1.1.2.3  2003/12/17 13:36:58  simons

// Qmem mbist signals fixed.

//

// Revision 1.1.2.2  2003/12/09 11:46:48  simons

// Mbist nameing changed, Artisan ram instance signal names fixed, some synthesis waning fixed.

//

// Revision 1.1.2.1  2003/07/08 15:45:26  lampret

// Added embedded memory QMEM.

//

//

// synopsys translate_off

`include "timescale.v"

// synopsys translate_on

`include "or1200_defines.v"

`define OR1200_QMEMFSM_IDLE     3'd0

`define OR1200_QMEMFSM_STORE    3'd1

`define OR1200_QMEMFSM_LOAD     3'd2

`define OR1200_QMEMFSM_FETCH    3'd3

//

// Embedded memory

//

module or1200_qmem_top(

        // Rst, clk and clock control

        clk, rst,

`ifdef OR1200_BIST

        // RAM BIST

        mbist_si_i, mbist_so_o, mbist_ctrl_i,

`endif

        // QMEM and CPU/IMMU

        qmemimmu_adr_i,

        qmemimmu_cycstb_i,

        qmemimmu_ci_i,

        qmemicpu_sel_i,

        qmemicpu_tag_i,

        qmemicpu_dat_o,

        qmemicpu_ack_o,

        qmemimmu_rty_o,

        qmemimmu_err_o,

        qmemimmu_tag_o,

        // QMEM and IC

        icqmem_adr_o,

        icqmem_cycstb_o,

        icqmem_ci_o,

        icqmem_sel_o,

        icqmem_tag_o,

        icqmem_dat_i,

        icqmem_ack_i,

        icqmem_rty_i,

        icqmem_err_i,

        icqmem_tag_i,

        // QMEM and CPU/DMMU

        qmemdmmu_adr_i,

        qmemdmmu_cycstb_i,

        qmemdmmu_ci_i,

        qmemdcpu_we_i,

        qmemdcpu_sel_i,

        qmemdcpu_tag_i,

        qmemdcpu_dat_i,

        qmemdcpu_dat_o,

        qmemdcpu_ack_o,

        qmemdcpu_rty_o,

        qmemdmmu_err_o,

        qmemdmmu_tag_o,

        // QMEM and DC

        dcqmem_adr_o,

        dcqmem_cycstb_o,

        dcqmem_ci_o,

        dcqmem_we_o,

        dcqmem_sel_o,

        dcqmem_tag_o,

        dcqmem_dat_o,

        dcqmem_dat_i,

        dcqmem_ack_i,

        dcqmem_rty_i,

        dcqmem_err_i,

        dcqmem_tag_i

);

parameter dw = `OR1200_OPERAND_WIDTH;

//

// I/O

//

//

// Clock and reset

//

input                           clk;

input                           rst;

`ifdef OR1200_BIST

//

// RAM BIST

//

input mbist_si_i;

input [`OR1200_MBIST_CTRL_WIDTH - 1:0] mbist_ctrl_i;

output mbist_so_o;

`endif

//

// QMEM and CPU/IMMU

//

input   [31:0]                   qmemimmu_adr_i;

input                           qmemimmu_cycstb_i;

input                           qmemimmu_ci_i;

input   [3:0]                    qmemicpu_sel_i;

input   [3:0]                    qmemicpu_tag_i;

output  [31:0]                   qmemicpu_dat_o;

output                          qmemicpu_ack_o;

output                          qmemimmu_rty_o;

output                          qmemimmu_err_o;

output  [3:0]                    qmemimmu_tag_o;

//

// QMEM and IC

//

output  [31:0]                   icqmem_adr_o;

output                          icqmem_cycstb_o;

output                          icqmem_ci_o;

output  [3:0]                    icqmem_sel_o;

output  [3:0]                    icqmem_tag_o;

input   [31:0]                   icqmem_dat_i;

input                           icqmem_ack_i;

input                           icqmem_rty_i;

input                           icqmem_err_i;

input   [3:0]                    icqmem_tag_i;

//

// QMEM and CPU/DMMU

//

input   [31:0]                   qmemdmmu_adr_i;

input                           qmemdmmu_cycstb_i;

input                           qmemdmmu_ci_i;

input                           qmemdcpu_we_i;

input   [3:0]                    qmemdcpu_sel_i;

input   [3:0]                    qmemdcpu_tag_i;

input   [31:0]                   qmemdcpu_dat_i;

output  [31:0]                   qmemdcpu_dat_o;

output                          qmemdcpu_ack_o;

output                          qmemdcpu_rty_o;

output                          qmemdmmu_err_o;

output  [3:0]                    qmemdmmu_tag_o;

//

// QMEM and DC

//

output  [31:0]                   dcqmem_adr_o;

output                          dcqmem_cycstb_o;

output                          dcqmem_ci_o;

output                          dcqmem_we_o;

output  [3:0]                    dcqmem_sel_o;

output  [3:0]                    dcqmem_tag_o;

output  [dw-1:0]         dcqmem_dat_o;

input   [dw-1:0]         dcqmem_dat_i;

input                           dcqmem_ack_i;

input                           dcqmem_rty_i;

input                           dcqmem_err_i;

input   [3:0]                    dcqmem_tag_i;

`ifdef OR1200_QMEM_IMPLEMENTED

//

// Internal regs and wires

//

wire                            iaddr_qmem_hit;

wire                            daddr_qmem_hit;

reg     [2:0]                    state;

reg                             qmem_dack;

reg                             qmem_iack;

wire    [31:0]                   qmem_di;

wire    [31:0]                   qmem_do;

wire                            qmem_en;

wire                            qmem_we;

`ifdef OR1200_QMEM_BSEL

wire  [3:0]       qmem_sel;

`endif

wire    [31:0]                   qmem_addr;

`ifdef OR1200_QMEM_ACK

wire              qmem_ack;

`else

wire              qmem_ack = 1'b1;

`endif

//

// QMEM and CPU/IMMU

//

assign qmemicpu_dat_o = qmem_iack ? qmem_do : icqmem_dat_i;

assign qmemicpu_ack_o = qmem_iack ? 1'b1 : icqmem_ack_i;

assign qmemimmu_rty_o = qmem_iack ? 1'b0 : icqmem_rty_i;

assign qmemimmu_err_o = qmem_iack ? 1'b0 : icqmem_err_i;

assign qmemimmu_tag_o = qmem_iack ? 4'h0 : icqmem_tag_i;

//

// QMEM and IC

//

assign icqmem_adr_o = iaddr_qmem_hit ? 32'h0000_0000 : qmemimmu_adr_i;

assign icqmem_cycstb_o = iaddr_qmem_hit ? 1'b0 : qmemimmu_cycstb_i;

assign icqmem_ci_o = iaddr_qmem_hit ? 1'b0 : qmemimmu_ci_i;

assign icqmem_sel_o = iaddr_qmem_hit ? 4'h0 : qmemicpu_sel_i;

assign icqmem_tag_o = iaddr_qmem_hit ? 4'h0 : qmemicpu_tag_i;

//

// QMEM and CPU/DMMU

//

assign qmemdcpu_dat_o = daddr_qmem_hit ? qmem_do : dcqmem_dat_i;

assign qmemdcpu_ack_o = daddr_qmem_hit ? qmem_dack : dcqmem_ack_i;

assign qmemdcpu_rty_o = daddr_qmem_hit ? ~qmem_dack : dcqmem_rty_i;

assign qmemdmmu_err_o = daddr_qmem_hit ? 1'b0 : dcqmem_err_i;

assign qmemdmmu_tag_o = daddr_qmem_hit ? 4'h0 : dcqmem_tag_i;

//

// QMEM and DC

//

assign dcqmem_adr_o = daddr_qmem_hit ? 32'h0000_0000 : qmemdmmu_adr_i;

assign dcqmem_cycstb_o = daddr_qmem_hit ? 1'b0 : qmemdmmu_cycstb_i;

assign dcqmem_ci_o = daddr_qmem_hit ? 1'b0 : qmemdmmu_ci_i;

assign dcqmem_we_o = daddr_qmem_hit ? 1'b0 : qmemdcpu_we_i;

assign dcqmem_sel_o = daddr_qmem_hit ? 4'h0 : qmemdcpu_sel_i;

assign dcqmem_tag_o = daddr_qmem_hit ? 4'h0 : qmemdcpu_tag_i;

assign dcqmem_dat_o = daddr_qmem_hit ? 32'h0000_0000 : qmemdcpu_dat_i;

//

// Address comparison whether QMEM was hit

//

`ifdef OR1200_QMEM_IADDR

assign iaddr_qmem_hit = (qmemimmu_adr_i & `OR1200_QMEM_IMASK) == `OR1200_QMEM_IADDR;

`else

assign iaddr_qmem_hit = 1'b0;

`endif

`ifdef OR1200_QMEM_DADDR

assign daddr_qmem_hit = (qmemdmmu_adr_i & `OR1200_QMEM_DMASK) == `OR1200_QMEM_DADDR;

`else

assign daddr_qmem_hit = 1'b0;

`endif

//

//

//

assign qmem_en = iaddr_qmem_hit & qmemimmu_cycstb_i | daddr_qmem_hit & qmemdmmu_cycstb_i;

assign qmem_we = qmemdmmu_cycstb_i & daddr_qmem_hit & qmemdcpu_we_i;

`ifdef OR1200_QMEM_BSEL

assign qmem_sel = (qmemdmmu_cycstb_i & daddr_qmem_hit) ? qmemdcpu_sel_i : qmemicpu_sel_i;

`endif

assign qmem_di = qmemdcpu_dat_i;

assign qmem_addr = (qmemdmmu_cycstb_i & daddr_qmem_hit) ? qmemdmmu_adr_i : qmemimmu_adr_i;

//

// QMEM control FSM

//

always @(`OR1200_RST_EVENT rst or posedge clk)

        if (rst == `OR1200_RST_VALUE) begin

                state <=  `OR1200_QMEMFSM_IDLE;

                qmem_dack <=  1'b0;

                qmem_iack <=  1'b0;

        end

        else case (state)       // synopsys parallel_case

                `OR1200_QMEMFSM_IDLE: begin

                        if (qmemdmmu_cycstb_i & daddr_qmem_hit & qmemdcpu_we_i & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_STORE;

                                qmem_dack <=  1'b1;

                                qmem_iack <=  1'b0;

                        end

                        else if (qmemdmmu_cycstb_i & daddr_qmem_hit & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_LOAD;

                                qmem_dack <=  1'b1;

                                qmem_iack <=  1'b0;

                        end

                        else if (qmemimmu_cycstb_i & iaddr_qmem_hit & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_FETCH;

                                qmem_iack <=  1'b1;

                                qmem_dack <=  1'b0;

                        end

                end

                `OR1200_QMEMFSM_STORE: begin

                        if (qmemdmmu_cycstb_i & daddr_qmem_hit & qmemdcpu_we_i & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_STORE;

                                qmem_dack <=  1'b1;

                                qmem_iack <=  1'b0;

                        end

                        else if (qmemdmmu_cycstb_i & daddr_qmem_hit & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_LOAD;

                                qmem_dack <=  1'b1;

                                qmem_iack <=  1'b0;

                        end

                        else if (qmemimmu_cycstb_i & iaddr_qmem_hit & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_FETCH;

                                qmem_iack <=  1'b1;

                                qmem_dack <=  1'b0;

                        end

                        else begin

                                state <=  `OR1200_QMEMFSM_IDLE;

                                qmem_dack <=  1'b0;

                                qmem_iack <=  1'b0;

                        end

                end

                `OR1200_QMEMFSM_LOAD: begin

                        if (qmemdmmu_cycstb_i & daddr_qmem_hit & qmemdcpu_we_i & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_STORE;

                                qmem_dack <=  1'b1;

                                qmem_iack <=  1'b0;

                        end

                        else if (qmemdmmu_cycstb_i & daddr_qmem_hit & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_LOAD;

                                qmem_dack <=  1'b1;

                                qmem_iack <=  1'b0;

                        end

                        else if (qmemimmu_cycstb_i & iaddr_qmem_hit & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_FETCH;

                                qmem_iack <=  1'b1;

                                qmem_dack <=  1'b0;

                        end

                        else begin

                                state <=  `OR1200_QMEMFSM_IDLE;

                                qmem_dack <=  1'b0;

                                qmem_iack <=  1'b0;

                        end

                end

                `OR1200_QMEMFSM_FETCH: begin

                        if (qmemdmmu_cycstb_i & daddr_qmem_hit & qmemdcpu_we_i & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_STORE;

                                qmem_dack <=  1'b1;

                                qmem_iack <=  1'b0;

                        end

                        else if (qmemdmmu_cycstb_i & daddr_qmem_hit & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_LOAD;

                                qmem_dack <=  1'b1;

                                qmem_iack <=  1'b0;

                        end

                        else if (qmemimmu_cycstb_i & iaddr_qmem_hit & qmem_ack) begin

                                state <=  `OR1200_QMEMFSM_FETCH;

                                qmem_iack <=  1'b1;

                                qmem_dack <=  1'b0;

                        end

                        else begin

                                state <=  `OR1200_QMEMFSM_IDLE;

                                qmem_dack <=  1'b0;

                                qmem_iack <=  1'b0;

                        end

                end

                default: begin

                        state <=  `OR1200_QMEMFSM_IDLE;

                        qmem_dack <=  1'b0;

                        qmem_iack <=  1'b0;

                end

        endcase

//

// Instantiation of embedded memory

//

or1200_spram_2048x32 or1200_qmem_ram(

        .clk(clk),

        .rst(rst),

`ifdef OR1200_BIST

        // RAM BIST

        .mbist_si_i(mbist_si_i),

        .mbist_so_o(mbist_so_o),

        .mbist_ctrl_i(mbist_ctrl_i),

`endif

        .addr(qmem_addr[12:2]),

`ifdef OR1200_QMEM_BSEL

        .sel(qmem_sel),

`endif

`ifdef OR1200_QMEM_ACK

  .ack(qmem_ack),

`endif

  .ce(qmem_en),

        .we(qmem_we),

        .oe(1'b1),

        .di(qmem_di),

        .doq(qmem_do)

);

`else  // OR1200_QMEM_IMPLEMENTED

//

// QMEM and CPU/IMMU

//

assign qmemicpu_dat_o = icqmem_dat_i;

assign qmemicpu_ack_o = icqmem_ack_i;

assign qmemimmu_rty_o = icqmem_rty_i;

assign qmemimmu_err_o = icqmem_err_i;

assign qmemimmu_tag_o = icqmem_tag_i;

//

// QMEM and IC

//

assign icqmem_adr_o = qmemimmu_adr_i;

assign icqmem_cycstb_o = qmemimmu_cycstb_i;

assign icqmem_ci_o = qmemimmu_ci_i;

assign icqmem_sel_o = qmemicpu_sel_i;

assign icqmem_tag_o = qmemicpu_tag_i;

//

// QMEM and CPU/DMMU

//

assign qmemdcpu_dat_o = dcqmem_dat_i;

assign qmemdcpu_ack_o = dcqmem_ack_i;

assign qmemdcpu_rty_o = dcqmem_rty_i;

assign qmemdmmu_err_o = dcqmem_err_i;

assign qmemdmmu_tag_o = dcqmem_tag_i;

//

// QMEM and DC

//

assign dcqmem_adr_o = qmemdmmu_adr_i;

assign dcqmem_cycstb_o = qmemdmmu_cycstb_i;

assign dcqmem_ci_o = qmemdmmu_ci_i;

assign dcqmem_we_o = qmemdcpu_we_i;

assign dcqmem_sel_o = qmemdcpu_sel_i;

assign dcqmem_tag_o = qmemdcpu_tag_i;

assign dcqmem_dat_o = qmemdcpu_dat_i;

`ifdef OR1200_BIST

assign mbist_so_o = mbist_si_i;

`endif

`endif

endmodule