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/*********************************************************************
 
  SDRAM Controller top File                                  
 
  This file is part of the sdram controller project           
  http://www.opencores.org/cores/sdr_ctrl/                    
 
  Description: SDRAM Controller Top Module.
    Support 81/6/32 Bit SDRAM.
    Column Address is Programmable
    Bank Bit are 2 Bit
    Row Bits are 12 Bits
 
    This block integrate following sub modules
 
    sdrc_core   
        SDRAM Controller file
    wb2sdrc    
        This module transalate the bus protocl from wishbone to custome
	sdram controller
 
  To Do:                                                      
    nothing                                                   
 
  Author(s): Dinesh Annayya, dinesha@opencores.org                 
  Version  : 0.0 - 8th Jan 2012
                Initial version with 16/32 Bit SDRAM Support
           : 0.1 - 24th Jan 2012
	         8 Bit SDRAM Support is added
	     0.2 - 31st Jan 2012
	         sdram_dq and sdram_pad_clk are internally generated
 
 
 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                     
 
*******************************************************************/
 
 
`include "sdrc_define.v"
module sdrc_top 
           (
                    cfg_sdr_width       ,
                    cfg_colbits         ,
 
                // WB bus
                    wb_rst_i            ,
                    wb_clk_i            ,
 
                    wb_stb_i            ,
                    wb_ack_o            ,
                    wb_addr_i           ,
                    wb_we_i             ,
                    wb_dat_i            ,
                    wb_sel_i            ,
                    wb_dat_o            ,
                    wb_cyc_i            ,
                    wb_cti_i            , 
 
 
		/* Interface to SDRAMs */
                    sdram_clk           ,
                    sdram_resetn        ,
                    sdr_cs_n            ,
                    sdr_cke             ,
                    sdr_ras_n           ,
                    sdr_cas_n           ,
                    sdr_we_n            ,
                    sdr_dqm             ,
                    sdr_ba              ,
                    sdr_addr            , 
                    sdr_dq              ,
 
		/* Parameters */
                    sdr_init_done       ,
                    cfg_req_depth       ,	        //how many req. buffer should hold
                    cfg_sdr_en          ,
                    cfg_sdr_mode_reg    ,
                    cfg_sdr_tras_d      ,
                    cfg_sdr_trp_d       ,
                    cfg_sdr_trcd_d      ,
                    cfg_sdr_cas         ,
                    cfg_sdr_trcar_d     ,
                    cfg_sdr_twr_d       ,
                    cfg_sdr_rfsh        ,
	            cfg_sdr_rfmax
	    );
 
parameter      APP_AW   = 25;  // Application Address Width
parameter      APP_DW   = 32;  // Application Data Width 
parameter      APP_BW   = 4;   // Application Byte Width
parameter      APP_RW   = 9;   // Application Request Width
 
parameter      SDR_DW   = 16;  // SDR Data Width 
parameter      SDR_BW   = 2;   // SDR Byte Width
 
parameter      dw       = 32;  // data width
parameter      tw       = 8;   // tag id width
parameter      bl       = 9;   // burst_lenght_width 
 
//-----------------------------------------------
// Global Variable
// ----------------------------------------------
input                   sdram_clk          ; // SDRAM Clock 
input                   sdram_resetn       ; // Reset Signal
input [1:0]             cfg_sdr_width      ; // 2'b00 - 32 Bit SDR, 2'b01 - 16 Bit SDR, 2'b1x - 8 Bit
input [1:0]             cfg_colbits        ; // 2'b00 - 8 Bit column address, 
                                             // 2'b01 - 9 Bit, 10 - 10 bit, 11 - 11Bits
 
//--------------------------------------
// Wish Bone Interface
// -------------------------------------      
input                   wb_rst_i           ;
input                   wb_clk_i           ;
 
input                   wb_stb_i           ;
output                  wb_ack_o           ;
input [25:0]            wb_addr_i          ;
input                   wb_we_i            ; // 1 - Write, 0 - Read
input [dw-1:0]          wb_dat_i           ;
input [dw/8-1:0]        wb_sel_i           ; // Byte enable
output [dw-1:0]         wb_dat_o           ;
input                   wb_cyc_i           ;
input  [2:0]            wb_cti_i           ;
 
//------------------------------------------------
// Interface to SDRAMs
//------------------------------------------------
output                  sdr_cke             ; // SDRAM CKE
output 			sdr_cs_n            ; // SDRAM Chip Select
output                  sdr_ras_n           ; // SDRAM ras
output                  sdr_cas_n           ; // SDRAM cas
output			sdr_we_n            ; // SDRAM write enable
output [SDR_BW-1:0] 	sdr_dqm             ; // SDRAM Data Mask
output [1:0] 		sdr_ba              ; // SDRAM Bank Enable
output [11:0] 		sdr_addr            ; // SDRAM Address
inout [SDR_DW-1:0] 	sdr_dq              ; // SDRA Data Input/output
 
//------------------------------------------------
// Configuration Parameter
//------------------------------------------------
output                  sdr_init_done       ; // Indicate SDRAM Initialisation Done
input [3:0] 		cfg_sdr_tras_d      ; // Active to precharge delay
input [3:0]             cfg_sdr_trp_d       ; // Precharge to active delay
input [3:0]             cfg_sdr_trcd_d      ; // Active to R/W delay
input 			cfg_sdr_en          ; // Enable SDRAM controller
input [1:0] 		cfg_req_depth       ; // Maximum Request accepted by SDRAM controller
input [11:0] 		cfg_sdr_mode_reg    ;
input [2:0] 		cfg_sdr_cas         ; // SDRAM CAS Latency
input [3:0] 		cfg_sdr_trcar_d     ; // Auto-refresh period
input [3:0]             cfg_sdr_twr_d       ; // Write recovery delay
input [`SDR_RFSH_TIMER_W-1 : 0] cfg_sdr_rfsh;
input [`SDR_RFSH_ROW_CNT_W -1 : 0] cfg_sdr_rfmax;
 
//--------------------------------------------
// SDRAM controller Interface 
//--------------------------------------------
wire                  app_req            ; // SDRAM request
wire [24:0]           app_req_addr       ; // SDRAM Request Address
wire [bl-1:0]         app_req_len        ;
wire                  app_req_wr_n       ; // 0 - Write, 1 -> Read
wire                  app_req_ack        ; // SDRAM request Accepted
wire                  app_busy_n         ; // 0 -> sdr busy
wire [dw/8-1:0]       app_wr_en_n        ; // Active low sdr byte-wise write data valid
wire                  app_wr_next_req    ; // Ready to accept the next write
wire                  app_rd_valid       ; // sdr read valid
wire                  app_last_rd        ; // Indicate last Read of Burst Transfer
wire                  app_last_wr        ; // Indicate last Write of Burst Transfer
wire [dw-1:0]         app_wr_data        ; // sdr write data
wire  [dw-1:0]        app_rd_data        ; // sdr read data
 
/****************************************
*  These logic has to be implemented using Pads
*  **************************************/
wire  [SDR_DW-1:0]    pad_sdr_din         ; // SDRA Data Input
wire  [SDR_DW-1:0]    sdr_dout            ; // SDRAM Data Output
wire  [SDR_BW-1:0]    sdr_den_n           ; // SDRAM Data Output enable
 
 
assign   sdr_dq = (&sdr_den_n == 1'b0) ? sdr_dout :  {SDR_DW{1'bz}}; 
assign   pad_sdr_din = sdr_dq;
 
// sdram pad clock is routed back through pad
// SDRAM Clock from Pad, used for registering Read Data
wire #(1.0) sdram_pad_clk = sdram_clk;
 
/************** Ends Here **************************/
wb2sdrc u_wb2sdrc (
      // WB bus
          .wb_rst_i           (wb_rst_i           ) ,
          .wb_clk_i           (wb_clk_i           ) ,
 
          .wb_stb_i           (wb_stb_i           ) ,
          .wb_ack_o           (wb_ack_o           ) ,
          .wb_addr_i          (wb_addr_i          ) ,
          .wb_we_i            (wb_we_i            ) ,
          .wb_dat_i           (wb_dat_i           ) ,
          .wb_sel_i           (wb_sel_i           ) ,
          .wb_dat_o           (wb_dat_o           ) ,
          .wb_cyc_i           (wb_cyc_i           ) ,
          .wb_cti_i           (wb_cti_i           ) , 
 
 
      //SDRAM Controller Hand-Shake Signal 
          .sdram_clk          (sdram_clk          ) ,
          .sdram_resetn       (sdram_resetn       ) ,
          .sdr_req            (app_req            ) ,
          .sdr_req_addr       (app_req_addr       ) ,
          .sdr_req_len        (app_req_len        ) ,
          .sdr_req_wr_n       (app_req_wr_n       ) ,
          .sdr_req_ack        (app_req_ack        ) ,
          .sdr_busy_n         (app_busy_n         ) ,
          .sdr_wr_en_n        (app_wr_en_n        ) ,
          .sdr_wr_next        (app_wr_next_req    ) ,
          .sdr_rd_valid       (app_rd_valid       ) ,
          .sdr_last_rd        (app_last_rd        ) ,
          .sdr_wr_data        (app_wr_data        ) ,
          .sdr_rd_data        (app_rd_data        ) 
 
      ); 
 
 
sdrc_core #(.SDR_DW(SDR_DW) , .SDR_BW(SDR_BW)) u_sdrc_core (
          .clk                (sdram_clk          ) ,
          .pad_clk            (sdram_pad_clk      ) ,
          .reset_n            (sdram_resetn       ) ,
          .sdr_width          (cfg_sdr_width      ) ,
          .cfg_colbits        (cfg_colbits        ) ,
 
 		/* Request from app */
          .app_req            (app_req            ) ,// Transfer Request
          .app_req_addr       (app_req_addr       ) ,// SDRAM Address
          .app_req_len        (app_req_len        ) ,// Burst Length (in 16 bit words)
          .app_req_wrap       (1'b0               ) ,// Wrap mode request 
          .app_req_wr_n       (app_req_wr_n       ) ,// 0 => Write request, 1 => read req
          .app_req_ack        (app_req_ack        ) ,// Request has been accepted
          .cfg_req_depth      (cfg_req_depth      ) ,//how many req. buffer should hold
 
          .app_wr_data        (app_wr_data        ) ,
          .app_wr_en_n        (app_wr_en_n        ) ,
          .app_rd_data        (app_rd_data        ) ,
          .app_rd_valid       (app_rd_valid       ) ,
	  .app_last_rd        (app_last_rd        ) ,
          .app_last_wr        (app_last_wr        ) ,
          .app_wr_next_req    (app_wr_next_req    ) ,
          .sdr_init_done      (sdr_init_done      ) ,
          .app_req_dma_last   (app_req            ) ,
 
 		/* Interface to SDRAMs */
          .sdr_cs_n           (sdr_cs_n           ) ,
          .sdr_cke            (sdr_cke            ) ,
          .sdr_ras_n          (sdr_ras_n          ) ,
          .sdr_cas_n          (sdr_cas_n          ) ,
          .sdr_we_n           (sdr_we_n           ) ,
          .sdr_dqm            (sdr_dqm            ) ,
          .sdr_ba             (sdr_ba             ) ,
          .sdr_addr           (sdr_addr           ) , 
          .pad_sdr_din        (pad_sdr_din        ) ,
          .sdr_dout           (sdr_dout           ) ,
          .sdr_den_n          (sdr_den_n          ) ,
 
 		/* Parameters */
          .cfg_sdr_en         (cfg_sdr_en         ) ,
          .cfg_sdr_mode_reg   (cfg_sdr_mode_reg   ) ,
          .cfg_sdr_tras_d     (cfg_sdr_tras_d     ) ,
          .cfg_sdr_trp_d      (cfg_sdr_trp_d      ) ,
          .cfg_sdr_trcd_d     (cfg_sdr_trcd_d     ) ,
          .cfg_sdr_cas        (cfg_sdr_cas        ) ,
          .cfg_sdr_trcar_d    (cfg_sdr_trcar_d    ) ,
          .cfg_sdr_twr_d      (cfg_sdr_twr_d      ) ,
          .cfg_sdr_rfsh       (cfg_sdr_rfsh       ) ,
          .cfg_sdr_rfmax      (cfg_sdr_rfmax      ) 
	       );
 
endmodule // sdrc_core