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

//

// Filename:    migsdram.v

//

// Project:     OpenArty, an entirely open SoC based upon the Arty platform

//

// Purpose:     To interface the Arty to a MIG Generated SDRAM

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Technology, LLC

//

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

//

// Copyright (C) 2015-2016, Gisselquist Technology, LLC

//

// This program is free software (firmware): you can redistribute it and/or

// modify it under the terms of  the GNU General Public License as published

// by the Free Software Foundation, either version 3 of the License, or (at

// your option) any later version.

//

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with this program.  (It's in the $(ROOT)/doc directory, run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

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

//

//

module  migsdram(i_clk, i_clk_200mhz, o_sys_clk, i_rst, o_sys_reset,

        // Wishbone components

                i_wb_cyc, i_wb_stb, i_wb_we, i_wb_addr, i_wb_data, i_wb_sel,

                o_wb_ack, o_wb_stall, o_wb_data, o_wb_err,

        // SDRAM connections

                o_ddr_ck_p, o_ddr_ck_n,

                o_ddr_reset_n, o_ddr_cke,

                o_ddr_cs_n, o_ddr_ras_n, o_ddr_cas_n, o_ddr_we_n,

                o_ddr_ba, o_ddr_addr,

                o_ddr_odt, o_ddr_dm,

                io_ddr_dqs_p, io_ddr_dqs_n,

                io_ddr_data,

        // Debug connection

                o_ram_dbg

        );

        parameter       DDRWIDTH = 16, WBDATAWIDTH=32;

        parameter       AXIDWIDTH = 6;

        // The SDRAM address bits (RAMABITS) are a touch more difficult to work

        // out.  Here we leave them as a fixed parameter, but there are 

        // consequences to this.  Specifically, the wishbone data width, the

        // wishbone address width, and this number have interactions not

        // well captured here.

        parameter       RAMABITS = 28;

        // All DDR3 memories have 8 timeslots.  This, if the DDR3 memory

        // has 16 bits to it (as above), the entire transaction must take

        // AXIWIDTH bits ...

        localparam      AXIWIDTH= DDRWIDTH *8;

        localparam      DW=WBDATAWIDTH;

        localparam      AW=(WBDATAWIDTH==32)? RAMABITS-2

                                :((WBDATAWIDTH==64) ? RAMABITS-3

                                :((WBDATAWIDTH==128) ? RAMABITS-4

                                : RAMABITS-5)); // (WBDATAWIDTH==256)

        localparam      SELW= (WBDATAWIDTH/8);

        //

        input                   i_clk, i_clk_200mhz, i_rst;

        output                  o_sys_clk;

        output  reg             o_sys_reset;

        //

        input                   i_wb_cyc, i_wb_stb, i_wb_we;

        input           [(AW-1):0]       i_wb_addr;

        input           [(DW-1):0]       i_wb_data;

        input           [(SELW-1):0]     i_wb_sel;

        output  wire                    o_wb_ack, o_wb_stall;

        output  wire    [(DW-1):0]       o_wb_data;

        output  wire                    o_wb_err;

        //

        output  wire    [0:0]             o_ddr_ck_p, o_ddr_ck_n;

        output  wire    [0:0]             o_ddr_cke;

        output  wire                    o_ddr_reset_n,

                                        o_ddr_ras_n, o_ddr_cas_n, o_ddr_we_n;

        output  wire    [0:0]                     o_ddr_cs_n;

        output  wire    [2:0]                    o_ddr_ba;

        output  wire    [13:0]                   o_ddr_addr;

        output  wire    [0:0]                     o_ddr_odt;

        output  wire    [(DDRWIDTH/8-1):0]       o_ddr_dm;

        inout   wire    [1:0]                    io_ddr_dqs_p, io_ddr_dqs_n;

        inout   wire    [(DDRWIDTH-1):0] io_ddr_data;

        output  wire    [31:0]                   o_ram_dbg;

`define SDRAM_ACCESS

`ifdef  SDRAM_ACCESS

        wire    aresetn;

        assign  aresetn = 1'b1; // Never reset

        // Write address channel

        wire    [(AXIDWIDTH-1):0]        s_axi_awid;

        wire    [(RAMABITS-1):0] s_axi_awaddr;

        wire    [7:0]                    s_axi_awlen;

        wire    [2:0]                    s_axi_awsize;

        wire    [1:0]                    s_axi_awburst;

        wire    [0:0]                     s_axi_awlock;

        wire    [3:0]                    s_axi_awcache;

        wire    [2:0]                    s_axi_awprot;

        wire    [3:0]                    s_axi_awqos;

        wire                            s_axi_awvalid;

        wire                            s_axi_awready;

        // Writei data channel

        wire    [(AXIWIDTH-1):0] s_axi_wdata;

        wire    [(AXIWIDTH/8-1):0]       s_axi_wstrb;

        wire                            s_axi_wlast, s_axi_wvalid, s_axi_wready;

        // Write response channel

        wire                            s_axi_bready;

        wire    [(AXIDWIDTH-1):0]        s_axi_bid;

        wire    [1:0]                    s_axi_bresp;

        wire                            s_axi_bvalid;

        // Read address channel

        wire    [(AXIDWIDTH-1):0]        s_axi_arid;

        wire    [(RAMABITS-1):0] s_axi_araddr;

        wire    [7:0]                    s_axi_arlen;

        wire    [2:0]                    s_axi_arsize;

        wire    [1:0]                    s_axi_arburst;

        wire    [0:0]                     s_axi_arlock;

        wire    [3:0]                    s_axi_arcache;

        wire    [2:0]                    s_axi_arprot;

        wire    [3:0]                    s_axi_arqos;

        wire                            s_axi_arvalid;

        // Read response/data channel

        wire    [(AXIDWIDTH-1):0]        s_axi_rid;

        wire    [(AXIWIDTH-1):0] s_axi_rdata;

        wire    [1:0]                    s_axi_rresp;

        wire                            s_axi_rlast;

        wire                            s_axi_rvalid;

        // Other wires ...

        wire            init_calib_complete, mmcm_locked;

        wire            app_sr_active, app_ref_ack, app_zq_ack;

        wire            app_sr_req, app_ref_req, app_zq_req;

        wire            w_sys_reset;

        wire    [11:0]   w_device_temp;

        mig_axis        mig_sdram(

                .ddr3_ck_p(o_ddr_ck_p),         .ddr3_ck_n(o_ddr_ck_n),

                .ddr3_reset_n(o_ddr_reset_n),   .ddr3_cke(o_ddr_cke),

                .ddr3_cs_n(o_ddr_cs_n),         .ddr3_ras_n(o_ddr_ras_n),

                .ddr3_we_n(o_ddr_we_n),         .ddr3_cas_n(o_ddr_cas_n),

                .ddr3_ba(o_ddr_ba),             .ddr3_addr(o_ddr_addr),

                .ddr3_odt(o_ddr_odt),

                .ddr3_dqs_p(io_ddr_dqs_p),      .ddr3_dqs_n(io_ddr_dqs_n),

                .ddr3_dq(io_ddr_data),          .ddr3_dm(o_ddr_dm),

                //

                .sys_clk_i(i_clk),

                .clk_ref_i(i_clk_200mhz),

                .ui_clk(o_sys_clk),

                .ui_clk_sync_rst(w_sys_reset),

                .mmcm_locked(mmcm_locked),

                .aresetn(aresetn),

                .app_sr_req(1'b0),

                .app_ref_req(1'b0),

                .app_zq_req(1'b0),

                .app_sr_active(app_sr_active),

                .app_ref_ack(app_ref_ack),

                .app_zq_ack(app_zq_ack),

                //

                .s_axi_awid(s_axi_awid),        .s_axi_awaddr(s_axi_awaddr),

                .s_axi_awlen(s_axi_awlen),      .s_axi_awsize(s_axi_awsize),

                .s_axi_awburst(s_axi_awburst),  .s_axi_awlock(s_axi_awlock),

                .s_axi_awcache(s_axi_awcache),  .s_axi_awprot(s_axi_awprot),

                .s_axi_awqos(s_axi_awqos),      .s_axi_awvalid(s_axi_awvalid),

                .s_axi_awready(s_axi_awready),

                //

                .s_axi_wready(  s_axi_wready),

                .s_axi_wdata(   s_axi_wdata),

                .s_axi_wstrb(   s_axi_wstrb),

                .s_axi_wlast(   s_axi_wlast),

                .s_axi_wvalid(  s_axi_wvalid),

                //

                .s_axi_bready(s_axi_bready),    .s_axi_bid(s_axi_bid),

                .s_axi_bresp(s_axi_bresp),      .s_axi_bvalid(s_axi_bvalid),

                //

                .s_axi_arid(s_axi_arid),        .s_axi_araddr(s_axi_araddr),

                .s_axi_arlen(s_axi_arlen),      .s_axi_arsize(s_axi_arsize),

                .s_axi_arburst(s_axi_arburst),  .s_axi_arlock(s_axi_arlock),

                .s_axi_arcache(s_axi_arcache),  .s_axi_arprot(s_axi_arprot),

                .s_axi_arqos(s_axi_arqos),      .s_axi_arvalid(s_axi_arvalid),

                .s_axi_arready(s_axi_arready),

                // 

                .s_axi_rready(s_axi_rready),    .s_axi_rid(s_axi_rid),

                .s_axi_rdata(s_axi_rdata),      .s_axi_rresp(s_axi_rresp),

                .s_axi_rlast(s_axi_rlast),      .s_axi_rvalid(s_axi_rvalid),

                .init_calib_complete(init_calib_complete),

                .sys_rst(i_rst),

                .device_temp(w_device_temp)

                );

        wbm2axisp       #(

                        .C_AXI_ID_WIDTH(AXIDWIDTH),

                        .C_AXI_DATA_WIDTH(AXIWIDTH),

                        .C_AXI_ADDR_WIDTH(RAMABITS),

                        .AW(AW), .DW(DW)

                        )

                        bus_translator (

                                .i_clk(o_sys_clk),

                                // .i_reset(i_rst), // internally unused

                                // Write address channel signals

                                .o_axi_awid(    s_axi_awid),

                                .o_axi_awaddr(  s_axi_awaddr),

                                .o_axi_awlen(   s_axi_awlen),

                                .o_axi_awsize(  s_axi_awsize),

                                .o_axi_awburst( s_axi_awburst),

                                .o_axi_awlock(  s_axi_awlock),

                                .o_axi_awcache( s_axi_awcache),

                                .o_axi_awprot(  s_axi_awprot),  // s_axi_awqos

                                .o_axi_awqos(   s_axi_awqos),  // s_axi_awqos

                                .o_axi_awvalid( s_axi_awvalid),

                                .i_axi_awready( s_axi_awready),

                        //

                                .i_axi_wready(  s_axi_wready),

                                .o_axi_wdata(   s_axi_wdata),

                                .o_axi_wstrb(   s_axi_wstrb),

                                .o_axi_wlast(   s_axi_wlast),

                                .o_axi_wvalid(  s_axi_wvalid),

                        //

                                .o_axi_bready(  s_axi_bready),

                                .i_axi_bid(     s_axi_bid),

                                .i_axi_bresp(   s_axi_bresp),

                                .i_axi_bvalid(  s_axi_bvalid),

                        //

                                .i_axi_arready( s_axi_arready),

                                .o_axi_arid(    s_axi_arid),

                                .o_axi_araddr(  s_axi_araddr),

                                .o_axi_arlen(   s_axi_arlen),

                                .o_axi_arsize(  s_axi_arsize),

                                .o_axi_arburst( s_axi_arburst),

                                .o_axi_arlock(  s_axi_arlock),

                                .o_axi_arcache( s_axi_arcache),

                                .o_axi_arprot(  s_axi_arprot),

                                .o_axi_arqos(   s_axi_arqos),

                                .o_axi_arvalid( s_axi_arvalid),

                        //

                                .o_axi_rready(  s_axi_rready),

                                .i_axi_rid(     s_axi_rid),

                                .i_axi_rdata(   s_axi_rdata),

                                .i_axi_rresp(   s_axi_rresp),

                                .i_axi_rlast(   s_axi_rlast),

                                .i_axi_rvalid(  s_axi_rvalid),

                        //

                                .i_wb_cyc(      i_wb_cyc),

                                .i_wb_stb(      i_wb_stb),

                                .i_wb_we(       i_wb_we),

                                .i_wb_addr(     i_wb_addr),

                                .i_wb_data(     i_wb_data),

                                .i_wb_sel(      i_wb_sel),

                        //

                                .o_wb_ack(      o_wb_ack),

                                .o_wb_stall(    o_wb_stall),

                                .o_wb_data(     o_wb_data),

                                .o_wb_err(      o_wb_err),

                        //

                                .o_dbg( o_ram_dbg)

                );

        // Convert from active low to active high, *and* hold the system in

        // reset until the memory comes up.     

        initial o_sys_reset = 1'b1;

        always @(posedge o_sys_clk)

                o_sys_reset <= (w_sys_reset)

                                ||(!init_calib_complete)

                                ||(!mmcm_locked);

`else

        BUFG    sysclk(i_clk, o_sys_clk);

        initial o_sys_reset <= 1'b1;

        always  @(posedge i_clk)

                o_sys_reset <= 1'b1;

        OBUFDS ckobuf(.I(i_clk), .O(o_ddr_ck_p), .OB(o_ddr_ck_n));

        assign  o_ddr_reset_n   = 1'b0;

        assign  o_ddr_cke[0]     = 1'b0;

        assign  o_ddr_cs_n[0]    = 1'b1;

        assign  o_ddr_cas_n     = 1'b1;

        assign  o_ddr_ras_n     = 1'b1;

        assign  o_ddr_we_n      = 1'b1;

        assign  o_ddr_ba        = 3'h0;

        assign  o_ddr_addr      = 14'h00;

        assign  o_ddr_dm        = 2'b00;

        assign  io_ddr_data     = 16'h0;

        OBUFDS  dqsbufa(.I(i_clk), .O(io_ddr_dqs_p[1]), .OB(io_ddr_dqs_n[1]));

        OBUFDS  dqsbufb(.I(i_clk), .O(io_ddr_dqs_p[0]), .OB(io_ddr_dqs_n[0]));

`endif

endmodule