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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 Rudolf Usselmann                         ////

////                    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 1.3 2001-09-24 00:38:21 rudi Exp $

//

//  $Date: 2001-09-24 00:38:21 $

//  $Revision: 1.3 $

//  $Author: rudi $

//  $Locker:  $

//  $State: Exp $

//

// Change History:

//               $Log: not supported by cvs2svn $

//               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, wb_err_o, wp_err,

        csc, tms, poc,

        sp_csc, sp_tms, cs,

        mc_data_i, mc_sts, mc_vpen, fs,

        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          wb_err_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;

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             ack_r;

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;

wire            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;

wire    [2:0]    cs_sel;

wire    [2:0]    sp_cs_sel;

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

//

assign wb_err_o = 1'b0;

always @(posedge clk)

        if(wb_cyc_i & wb_stb_i & `MC_REG_SEL & !wb_we_i)

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

           5'h0:        rf_dout <= #1 csr;

           5'h1:        rf_dout <= #1 poc;

           5'h2:        rf_dout <= #1 csc_mask;

           5'h4:        rf_dout <= #1 csc0;

           5'h5:        rf_dout <= #1 tms0;

           5'h6:        rf_dout <= #1 csc1;

           5'h7:        rf_dout <= #1 tms1;

           5'h8:        rf_dout <= #1 csc2;

           5'h9:        rf_dout <= #1 tms2;

           5'h10:       rf_dout <= #1 csc3;

           5'h11:       rf_dout <= #1 tms3;

           5'h12:       rf_dout <= #1 csc4;

           5'h13:       rf_dout <= #1 tms4;

           5'h14:       rf_dout <= #1 csc5;

           5'h15:       rf_dout <= #1 tms5;

           5'h16:       rf_dout <= #1 csc6;

           5'h17:       rf_dout <= #1 tms6;

           5'h18:       rf_dout <= #1 csc7;

           5'h19:       rf_dout <= #1 tms7;

        endcase

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

//

// WISHBONE Register Write logic

//

assign rf_we = `MC_REG_SEL & wb_we_i & wb_cyc_i & wb_stb_i;

always @(posedge clk or posedge rst)

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

        else

        if(rf_we & (wb_addr_i[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_i[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 11'h7ff;

        else

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

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

always @(posedge clk)

        if(rst)         poc <= #1 mc_data_i;

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

//

// WISHBONE Register Ack logic

//

always @(posedge clk)

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

always @(posedge clk)

        wb_ack_o <= #1 ack_r;

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

//

// Select CSC and TMS Registers

//

always @(posedge clk)

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

always @(posedge clk)

        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;

assign cs_sel[0] = cs1 | cs3 | cs5 | cs7;

assign cs_sel[1] = cs2 | cs3 | cs6 | cs7;

assign cs_sel[2] = cs4 | cs5 | cs6 | cs7;

always @(posedge clk)

        if(cs_le)

        case(cs_sel)            // synopsys full_case parallel_case

           3'h0: csc <= #1 csc0;

           3'h1: csc <= #1 csc1;

           3'h2: csc <= #1 csc2;

           3'h3: csc <= #1 csc3;

           3'h4: csc <= #1 csc4;

           3'h5: csc <= #1 csc5;

           3'h6: csc <= #1 csc6;

           3'h7: csc <= #1 csc7;

        endcase

always @(posedge clk)

        if(cs_le | rf_we)

        case(cs_sel)            // synopsys full_case parallel_case

           3'h0: tms <= #1 tms0;

           3'h1: tms <= #1 tms1;

           3'h2: tms <= #1 tms2;

           3'h3: tms <= #1 tms3;

           3'h4: tms <= #1 tms4;

           3'h5: tms <= #1 tms5;

           3'h6: tms <= #1 tms6;

           3'h7: tms <= #1 tms7;

        endcase

assign sp_cs_sel[0] = spec_req_cs[1] | spec_req_cs[3] | spec_req_cs[5] | spec_req_cs[7];

assign sp_cs_sel[1] = spec_req_cs[2] | spec_req_cs[3] | spec_req_cs[6] | spec_req_cs[7];

assign sp_cs_sel[2] = spec_req_cs[4] | spec_req_cs[5] | spec_req_cs[6] | spec_req_cs[7];

always @(posedge clk)

        if(cs_le)

        case(sp_cs_sel)         // synopsys full_case parallel_case

           3'h0: sp_csc <= #1 csc0;

           3'h1: sp_csc <= #1 csc1;

           3'h2: sp_csc <= #1 csc2;

           3'h3: sp_csc <= #1 csc3;

           3'h4: sp_csc <= #1 csc4;

           3'h5: sp_csc <= #1 csc5;

           3'h6: sp_csc <= #1 csc6;

           3'h7: sp_csc <= #1 csc7;

        endcase

always @(posedge clk)

        if(cs_le | rf_we)

        case(sp_cs_sel)         // synopsys full_case parallel_case

           3'h0: sp_tms <= #1 tms0;

           3'h1: sp_tms <= #1 tms1;

           3'h2: sp_tms <= #1 tms2;

           3'h3: sp_tms <= #1 tms3;

           3'h4: sp_tms <= #1 tms4;

           3'h5: sp_tms <= #1 tms5;

           3'h6: sp_tms <= #1 tms6;

           3'h7: sp_tms <= #1 tms7;

        endcase

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)

        if(sreq_cs_le)  spec_req_cs <= #1 spec_req_cs_d;

always @(posedge clk)

        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)

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

                        init_req4 | init_req5 | init_req6 | init_req7;

always @(posedge clk)

        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        ),

                .lmr_ack(       lmr_ack2        ),

                .init_req(      init_req2       ),

                .init_ack(      init_ack2       )

                );

`else

mc_cs_rf_dummy #(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        ),

                .lmr_ack(       lmr_ack2        ),

                .init_req(      init_req2       ),

                .init_ack(      init_ack2       )

                );

`endif

`ifdef MC_HAVE_CS3

mc_cs_rf #(3'h3) u3(

                .clk(           clk             ),

                .rst(           rst             ),

                .wb_we_i(       wb_we_i         ),

                .din(           wb_data_i       ),

                .rf_we(         rf_we           ),

                .addr(          wb_addr_i       ),

                .csc(           csc3            ),

                .tms(           tms3            ),

                .poc(           poc             ),

                .csc_mask(      csc_mask        ),

                .cs(            cs3             ),

                .wp_err(        wp_err3         ),

                .lmr_req(       lmr_req3        ),

                .lmr_ack(       lmr_ack3        ),

                .init_req(      init_req3       ),

                .init_ack(      init_ack3       )

                );

`else

mc_cs_rf_dummy #(3'h3) u3(

                .clk(           clk             ),

                .rst(           rst             ),

                .wb_we_i(       wb_we_i         ),

                .din(           wb_data_i       ),

                .rf_we(         rf_we           ),

                .addr(          wb_addr_i       ),

                .csc(           csc3            ),

                .tms(           tms3            ),

                .poc(           poc             ),

                .csc_mask(      csc_mask        ),

                .cs(            cs3             ),

                .wp_err(        wp_err3         ),

                .lmr_req(       lmr_req3        ),

                .lmr_ack(       lmr_ack3        ),

                .init_req(      init_req3       ),

                .init_ack(      init_ack3       )

                );

`endif

`ifdef MC_HAVE_CS4

mc_cs_rf #(3'h4) u4(

                .clk(           clk             ),

                .rst(           rst             ),

                .wb_we_i(       wb_we_i         ),

                .din(           wb_data_i       ),

                .rf_we(         rf_we           ),

                .addr(          wb_addr_i       ),

                .csc(           csc4            ),

                .tms(           tms4            ),

                .poc(           poc             ),

                .csc_mask(      csc_mask        ),

                .cs(            cs4             ),

                .wp_err(        wp_err4         ),