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

////                                                             ////

////  WISHBONE Memory Controller Register File                   ////

////                                                             ////

////                                                             ////

////  Author: Rudolf Usselmann                                   ////

////          rudi@asics.ws                                      ////

////                                                             ////

////                                                             ////

////  Downloaded from: http://www.opencores.org/cores/mem_ctrl/  ////

////                                                             ////

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

////                                                             ////

//// Copyright (C) 2000-2002 Rudolf Usselmann                    ////

////                         www.asics.ws                        ////

////                         rudi@asics.ws                       ////

////                                                             ////

//// 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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     ////

//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   ////

//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   ////

//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      ////

//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         ////

//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    ////

//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   ////

//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        ////

//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  ////

//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  ////

//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  ////

//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         ////

//// POSSIBILITY OF SUCH DAMAGE.                                 ////

////                                                             ////

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

//  CVS Log

//

//  $Id: mc_rf.v,v 1.8 2002/01/21 13:08:52 rudi Exp $

//

//  $Date: 2002/01/21 13:08:52 $

//  $Revision: 1.8 $

//  $Author: rudi $

//  $Locker:  $

//  $State: Exp $

//

// Change History:

//               $Log: mc_rf.v,v $

//               Revision 1.8  2002/01/21 13:08:52  rudi

//

//               Fixed several minor bugs, cleaned up the code further ...

//

//               Revision 1.7  2001/12/21 05:09:29  rudi

//

//               - Fixed combinatorial loops in synthesis

//               - Fixed byte select bug

//

//               Revision 1.6  2001/12/11 02:47:19  rudi

//

//               - Made some changes not to expect clock during reset ...

//

//               Revision 1.5  2001/11/29 02:16:28  rudi

//

//

//               - More Synthesis cleanup, mostly for speed

//               - Several bug fixes

//               - Changed code to avoid auto-precharge and

//                 burst-terminate combinations (apparently illegal ?)

//                 Now we will do a manual precharge ...

//

//               Revision 1.4  2001/10/04 03:19:37  rudi

//

//               Fixed Register reads

//               Tightened up timing for register rd/wr

//

//               Revision 1.3  2001/09/24 00:38:21  rudi

//

//               Changed Reset to be active high and async.

//

//               Revision 1.2  2001/08/10 08:16:21  rudi

//

//               - Changed IO names to be more clear.

//               - Uniquifyed define names to be core specific.

//               - Removed "Refresh Early" configuration

//

//               Revision 1.1  2001/07/29 07:34:41  rudi

//

//

//               1) Changed Directory Structure

//               2) Fixed several minor bugs

//

//               Revision 1.3  2001/06/12 15:19:49  rudi

//

//

//               Minor changes after running lint, and a small bug fix reading csr and ba_mask registers.

//

//               Revision 1.2  2001/06/03 11:37:17  rudi

//

//

//               1) Fixed Chip Select Mask Register

//                      - Power On Value is now all ones

//                      - Comparison Logic is now correct

//

//               2) All resets are now asynchronous

//

//               3) Converted Power On Delay to an configurable item

//

//               4) Added reset to Chip Select Output Registers

//

//               5) Forcing all outputs to Hi-Z state during reset

//

//               Revision 1.1.1.1  2001/05/13 09:39:42  rudi

//               Created Directory Structure

//

//

//

//

`include "mc_defines.v"

module mc_rf(clk, rst,

        wb_data_i, rf_dout, wb_addr_i, wb_we_i, wb_cyc_i,

        wb_stb_i, wb_ack_o, wp_err,

        csc, tms, poc,

        sp_csc, sp_tms, cs,

        mc_data_i, mc_sts, mc_vpen, fs,

        cs_le_d, cs_le, cs_need_rfr, ref_int, rfr_ps_val, init_req,

        init_ack, lmr_req, lmr_ack,

        spec_req_cs

        );

input           clk, rst;

// --------------------------------------

// WISHBONE INTERFACE 

// Slave Interface

input   [31:0]   wb_data_i;

output  [31:0]   rf_dout;

input   [31:0]   wb_addr_i;

input           wb_we_i;

input           wb_cyc_i;

input           wb_stb_i;

output          wb_ack_o;

output          wp_err;

// --------------------------------------

// Misc Signals

output  [31:0]   csc;

output  [31:0]   tms;

output  [31:0]   poc;

output  [31:0]   sp_csc;

output  [31:0]   sp_tms;

output  [7:0]    cs;

input   [31:0]   mc_data_i;

input           mc_sts;

output          mc_vpen;

output          fs;

input           cs_le_d;

input           cs_le;

output  [7:0]    cs_need_rfr;    // Indicates which chip selects have SDRAM

                                // attached and need to be refreshed

output  [2:0]    ref_int;        // Refresh Interval

output  [7:0]    rfr_ps_val;

output          init_req;

input           init_ack;

output          lmr_req;

input           lmr_ack;

output  [7:0]    spec_req_cs;

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

//

// Local Wires

//

reg             wb_ack_o;

reg     [31:0]   csc;

reg     [31:0]   tms;

reg     [31:0]   sp_csc;

reg     [31:0]   sp_tms;

reg     [31:0]   rf_dout;

reg     [7:0]    cs;

reg             rf_we;

wire    [31:0]   csr;

reg     [10:0]   csr_r;

reg     [7:0]    csr_r2;

reg     [31:0]   poc;

wire    [31:0]   csc_mask;

reg     [10:0]   csc_mask_r;

wire    [31:0]   csc0, tms0;

wire    [31:0]   csc1, tms1;

wire    [31:0]   csc2, tms2;

wire    [31:0]   csc3, tms3;

wire    [31:0]   csc4, tms4;

wire    [31:0]   csc5, tms5;

wire    [31:0]   csc6, tms6;

wire    [31:0]   csc7, tms7;

wire            cs0, cs1, cs2, cs3;

wire            cs4, cs5, cs6, cs7;

wire            wp_err0, wp_err1, wp_err2, wp_err3;

wire            wp_err4, wp_err5, wp_err6, wp_err7;

reg             wp_err;

wire            lmr_req7, lmr_req6, lmr_req5, lmr_req4;

wire            lmr_req3, lmr_req2, lmr_req1, lmr_req0;

wire            lmr_ack7, lmr_ack6, lmr_ack5, lmr_ack4;

wire            lmr_ack3, lmr_ack2, lmr_ack1, lmr_ack0;

wire            init_req7, init_req6, init_req5, init_req4;

wire            init_req3, init_req2, init_req1, init_req0;

wire            init_ack7, init_ack6, init_ack5, init_ack4;

wire            init_ack3, init_ack2, init_ack1, init_ack0;

reg             init_ack_r;

wire            init_ack_fe;

reg             lmr_ack_r;

wire            lmr_ack_fe;

wire    [7:0]    spec_req_cs_t;

wire    [7:0]    spec_req_cs_d;

reg     [7:0]    spec_req_cs;

reg             init_req, lmr_req;

reg             sreq_cs_le;

// Aliases

assign csr = {csr_r2, 8'h0, 5'h0, csr_r};

assign csc_mask = {21'h0, csc_mask_r};

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

//

// WISHBONE Register Read logic

//

always @(wb_addr_i or csr or poc or csc_mask or csc0 or tms0 or csc1 or

        tms1 or csc2 or tms2 or csc3 or tms3 or csc4 or tms4 or csc5 or

        tms5 or csc6 or tms6 or csc7 or tms7)

        case(wb_addr_i[6:2])            // synopsys full_case parallel_case

           5'h00:       rf_dout <= #1 csr;

           5'h01:       rf_dout <= #1 poc;

           5'h02:       rf_dout <= #1 csc_mask;

           5'h04:       rf_dout <= #1 csc0;

           5'h05:       rf_dout <= #1 tms0;

           5'h06:       rf_dout <= #1 csc1;

           5'h07:       rf_dout <= #1 tms1;

           5'h08:       rf_dout <= #1 csc2;

           5'h09:       rf_dout <= #1 tms2;

           5'h0a:       rf_dout <= #1 csc3;

           5'h0b:       rf_dout <= #1 tms3;

           5'h0c:       rf_dout <= #1 csc4;

           5'h0d:       rf_dout <= #1 tms4;

           5'h0e:       rf_dout <= #1 csc5;

           5'h0f:       rf_dout <= #1 tms5;

           5'h10:       rf_dout <= #1 csc6;

           5'h11:       rf_dout <= #1 tms6;

           5'h12:       rf_dout <= #1 csc7;

           5'h13:       rf_dout <= #1 tms7;

        endcase

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

//

// WISHBONE Register Write logic

//

reg     [6:0]    wb_addr_r;

always @(posedge clk)

        wb_addr_r <= #1 wb_addr_i[6:0];

always @(posedge clk or posedge rst)

        if(rst)         rf_we <= #1 1'b0;

        else            rf_we <= #1 `MC_REG_SEL & wb_we_i & wb_cyc_i & wb_stb_i & !rf_we;

always @(posedge clk or posedge rst)

        if(rst)         csr_r2 <= #1 8'h0;

        else

        if(rf_we & (wb_addr_r[6:2] == 5'h0) )

                        csr_r2 <= #1 wb_data_i[31:24];

always @(posedge clk or posedge rst)

        if(rst)         csr_r[10:1] <= #1 10'h0;

        else

        if(rf_we & (wb_addr_r[6:2] == 5'h0) )

                        csr_r[10:1] <= #1 wb_data_i[10:1];

always @(posedge clk)

        csr_r[0] <= #1 mc_sts;

assign mc_vpen = csr_r[1];

assign fs = csr_r[2];

assign rfr_ps_val = csr_r2[7:0];

always @(posedge clk or posedge rst)

        if(rst)         csc_mask_r <= #1 `MC_BA_MASK_VAL;

        else

        if(rf_we & (wb_addr_r[6:2] == 5'h2) )

                        csc_mask_r <= #1 wb_data_i[10:0];

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

//

// A kludge for cases where there is no clock during reset ...

//

reg     rst_r1, rst_r2, rst_r3;

always @(posedge clk or posedge rst)

        if(rst)         rst_r1 <= #1 1'b1;

        else            rst_r1 <= #1 1'b0;

always @(posedge clk or posedge rst)

        if(rst)         rst_r2 <= #1 1'b1;

        else            rst_r2 <= #1 rst_r1;

always @(posedge clk or posedge rst)

        if(rst)         rst_r3 <= #1 1'b1;

        else            rst_r3 <= #1 rst_r2;

always @(posedge clk)

        if(rst_r3)      poc <= #1 `MC_POC_VAL;

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

//

// WISHBONE Register Ack logic

//

always @(posedge clk)

        wb_ack_o <= #1 `MC_REG_SEL & wb_cyc_i & wb_stb_i & !wb_ack_o;

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

//

// Select CSC and TMS Registers

//

always @(posedge clk or posedge rst)

        if(rst)         cs <= #1 8'h0;

        else

        if(cs_le)       cs <= #1 {cs7, cs6, cs5, cs4, cs3, cs2, cs1, cs0};

always @(posedge clk or posedge rst)

        if(rst)         wp_err <= #1 1'b0;

        else

        if(cs_le & wb_cyc_i & wb_stb_i)

                        wp_err <= #1    wp_err7 | wp_err6 | wp_err5 | wp_err4 |

                                        wp_err3 | wp_err2 | wp_err1 | wp_err0;

        else

        if(!wb_cyc_i)   wp_err <= #1 1'b0;

always @(posedge clk or posedge rst)

        if(rst)         csc <= #1 32'h0;

        else

        if(cs_le_d & wb_cyc_i & wb_stb_i)

           begin

                if(cs0) csc <= #1 csc0;

                else

                if(cs1) csc <= #1 csc1;

                else

                if(cs2) csc <= #1 csc2;

                else

                if(cs3) csc <= #1 csc3;

                else

                if(cs4) csc <= #1 csc4;

                else

                if(cs5) csc <= #1 csc5;

                else

                if(cs6) csc <= #1 csc6;

                else    csc <= #1 csc7;

           end

always @(posedge clk or posedge rst)

        if(rst)         tms <= #1 32'hffff_ffff;

        else

        if((cs_le_d | rf_we) & wb_cyc_i & wb_stb_i)

           begin

                if(cs0) tms <= #1 tms0;

                else

                if(cs1) tms <= #1 tms1;

                else

                if(cs2) tms <= #1 tms2;

                else

                if(cs3) tms <= #1 tms3;

                else

                if(cs4) tms <= #1 tms4;

                else

                if(cs5) tms <= #1 tms5;

                else

                if(cs6) tms <= #1 tms6;

                else    tms <= #1 tms7;

           end

always @(posedge clk or posedge rst)

        if(rst)                         sp_csc <= #1 32'h0;

        else

        if(cs_le_d & wb_cyc_i & wb_stb_i)

           begin

                if(spec_req_cs[0])       sp_csc <= #1 csc0;

                else

                if(spec_req_cs[1])      sp_csc <= #1 csc1;

                else

                if(spec_req_cs[2])      sp_csc <= #1 csc2;

                else

                if(spec_req_cs[3])      sp_csc <= #1 csc3;

                else

                if(spec_req_cs[4])      sp_csc <= #1 csc4;

                else

                if(spec_req_cs[5])      sp_csc <= #1 csc5;

                else

                if(spec_req_cs[6])      sp_csc <= #1 csc6;

                else                    sp_csc <= #1 csc7;

           end

always @(posedge clk or posedge rst)

        if(rst)                         sp_tms <= #1 32'hffff_ffff;

        else

        if((cs_le_d | rf_we) & wb_cyc_i & wb_stb_i)

           begin

                if(spec_req_cs[0])       sp_tms <= #1 tms0;

                else

                if(spec_req_cs[1])      sp_tms <= #1 tms1;

                else

                if(spec_req_cs[2])      sp_tms <= #1 tms2;

                else

                if(spec_req_cs[3])      sp_tms <= #1 tms3;

                else

                if(spec_req_cs[4])      sp_tms <= #1 tms4;

                else

                if(spec_req_cs[5])      sp_tms <= #1 tms5;

                else

                if(spec_req_cs[6])      sp_tms <= #1 tms6;

                else                    sp_tms <= #1 tms7;

           end

assign  cs_need_rfr[0] = csc0[0] & (csc0[3:1] == `MC_MEM_TYPE_SDRAM);

assign  cs_need_rfr[1] = csc1[0] & (csc1[3:1] == `MC_MEM_TYPE_SDRAM);

assign  cs_need_rfr[2] = csc2[0] & (csc2[3:1] == `MC_MEM_TYPE_SDRAM);

assign  cs_need_rfr[3] = csc3[0] & (csc3[3:1] == `MC_MEM_TYPE_SDRAM);

assign  cs_need_rfr[4] = csc4[0] & (csc4[3:1] == `MC_MEM_TYPE_SDRAM);

assign  cs_need_rfr[5] = csc5[0] & (csc5[3:1] == `MC_MEM_TYPE_SDRAM);

assign  cs_need_rfr[6] = csc6[0] & (csc6[3:1] == `MC_MEM_TYPE_SDRAM);

assign  cs_need_rfr[7] = csc7[0] & (csc7[3:1] == `MC_MEM_TYPE_SDRAM);

assign ref_int = csr_r[10:8];

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

//

// Init & Lmr Logic

//

// Init Ack falling edge detector

always @(posedge clk)

        init_ack_r <= #1 init_ack;

assign  init_ack_fe = init_ack_r & !init_ack;

// LMR Ack falling edge detector

always @(posedge clk)

        lmr_ack_r <= #1 lmr_ack;

assign lmr_ack_fe = lmr_ack_r & !lmr_ack;

// Chip Select Output

always @(posedge clk or posedge rst)

        if(rst)         spec_req_cs <= #1 8'h0;

        else

        if(sreq_cs_le)  spec_req_cs <= #1 spec_req_cs_d;

always @(posedge clk or posedge rst)

        if(rst) sreq_cs_le <= #1 1'b0;

        else    sreq_cs_le <= #1 (!init_req & !lmr_req) | lmr_ack_fe | init_ack_fe;

// Make sure only one is serviced at a time

assign  spec_req_cs_d[0] = spec_req_cs_t[0];

assign  spec_req_cs_d[1] = spec_req_cs_t[1] & !spec_req_cs_t[0];

assign  spec_req_cs_d[2] = spec_req_cs_t[2] & !( |spec_req_cs_t[1:0] );

assign  spec_req_cs_d[3] = spec_req_cs_t[3] & !( |spec_req_cs_t[2:0] );

assign  spec_req_cs_d[4] = spec_req_cs_t[4] & !( |spec_req_cs_t[3:0] );

assign  spec_req_cs_d[5] = spec_req_cs_t[5] & !( |spec_req_cs_t[4:0] );

assign  spec_req_cs_d[6] = spec_req_cs_t[6] & !( |spec_req_cs_t[5:0] );

assign  spec_req_cs_d[7] = spec_req_cs_t[7] & !( |spec_req_cs_t[6:0] );

// Request Tracking

always @(posedge clk or posedge rst)

        if(rst) init_req <= #1 1'b0;

        else    init_req <= #1  init_req0 | init_req1 | init_req2 | init_req3 |

                                init_req4 | init_req5 | init_req6 | init_req7;

always @(posedge clk or posedge rst)

        if(rst) lmr_req <= #1 1'b0;

        else    lmr_req <= #1   lmr_req0 | lmr_req1 | lmr_req2 | lmr_req3 |

                                lmr_req4 | lmr_req5 | lmr_req6 | lmr_req7;

assign spec_req_cs_t = !init_req ?      // Load Mode Register Requests

                                {lmr_req7, lmr_req6, lmr_req5, lmr_req4,

                                lmr_req3, lmr_req2, lmr_req1, lmr_req0 } :

                                // Initialize SDRAM Requests

                                {init_req7, init_req6, init_req5, init_req4,

                                init_req3, init_req2, init_req1, init_req0 };

// Ack distribution

assign lmr_ack0 = spec_req_cs[0] & lmr_ack_fe;

assign lmr_ack1 = spec_req_cs[1] & lmr_ack_fe;

assign lmr_ack2 = spec_req_cs[2] & lmr_ack_fe;

assign lmr_ack3 = spec_req_cs[3] & lmr_ack_fe;

assign lmr_ack4 = spec_req_cs[4] & lmr_ack_fe;

assign lmr_ack5 = spec_req_cs[5] & lmr_ack_fe;

assign lmr_ack6 = spec_req_cs[6] & lmr_ack_fe;

assign lmr_ack7 = spec_req_cs[7] & lmr_ack_fe;

assign init_ack0 = spec_req_cs[0] & init_ack_fe;

assign init_ack1 = spec_req_cs[1] & init_ack_fe;

assign init_ack2 = spec_req_cs[2] & init_ack_fe;

assign init_ack3 = spec_req_cs[3] & init_ack_fe;

assign init_ack4 = spec_req_cs[4] & init_ack_fe;

assign init_ack5 = spec_req_cs[5] & init_ack_fe;

assign init_ack6 = spec_req_cs[6] & init_ack_fe;

assign init_ack7 = spec_req_cs[7] & init_ack_fe;

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

//

// Modules

//

mc_cs_rf #(3'h0) u0(

                .clk(           clk             ),

                .rst(           rst             ),

                .wb_we_i(       wb_we_i         ),

                .din(           wb_data_i       ),

                .rf_we(         rf_we           ),

                .addr(          wb_addr_i       ),

                .csc(           csc0            ),

                .tms(           tms0            ),

                .poc(           poc             ),

                .csc_mask(      csc_mask        ),

                .cs(            cs0             ),

                .wp_err(        wp_err0         ),

                .lmr_req(       lmr_req0        ),

                .lmr_ack(       lmr_ack0        ),

                .init_req(      init_req0       ),

                .init_ack(      init_ack0       )

                );

`ifdef MC_HAVE_CS1

mc_cs_rf #(3'h1) u1(

                .clk(           clk             ),

                .rst(           rst             ),

                .wb_we_i(       wb_we_i         ),

                .din(           wb_data_i       ),

                .rf_we(         rf_we           ),

                .addr(          wb_addr_i       ),

                .csc(           csc1            ),

                .tms(           tms1            ),

                .poc(           poc             ),

                .csc_mask(      csc_mask        ),

                .cs(            cs1             ),

                .wp_err(        wp_err1         ),

                .lmr_req(       lmr_req1        ),

                .lmr_ack(       lmr_ack1        ),

                .init_req(      init_req1       ),

                .init_ack(      init_ack1       )

                );

`else

mc_cs_rf_dummy #(3'h1) u1(

                .clk(           clk             ),

                .rst(           rst             ),

                .wb_we_i(       wb_we_i         ),

                .din(           wb_data_i       ),

                .rf_we(         rf_we           ),

                .addr(          wb_addr_i       ),

                .csc(           csc1            ),

                .tms(           tms1            ),

                .poc(           poc             ),

                .csc_mask(      csc_mask        ),

                .cs(            cs1             ),

                .wp_err(        wp_err1         ),

                .lmr_req(       lmr_req1        ),

                .lmr_ack(       lmr_ack1        ),

                .init_req(      init_req1       ),

                .init_ack(      init_ack1       )

                );

`endif

`ifdef MC_HAVE_CS2

mc_cs_rf #(3'h2) u2(

                .clk(           clk             ),

                .rst(           rst             ),

                .wb_we_i(       wb_we_i         ),

                .din(           wb_data_i       ),

                .rf_we(         rf_we           ),

                .addr(          wb_addr_i       ),

                .csc(           csc2            ),

                .tms(           tms2            ),

                .poc(           poc             ),

                .csc_mask(      csc_mask        ),

                .cs(            cs2             ),

                .wp_err(        wp_err2         ),

                .lmr_req(       lmr_req2        ),