//////////////////////////////////////////////////////////////////////////////
// SPDX-FileCopyrightText: 2021 , Dinesh Annayya                          
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// SPDX-License-Identifier: Apache-2.0
// SPDX-FileContributor: Created by Dinesh Annayya <dinesha@opencores.org>
//
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  MBIST TOP                                                   ////
////                                                              ////
////  This file is part of the mbist_ctrl cores project           ////
////  https://github.com/dineshannayya/mbist_ctrl.git             ////
////                                                              ////
////  Description                                                 ////
////      This block integrate mbist controller with row          ////
////      redendency feature                                      ////
////                                                              ////
////  To Do:                                                      ////
////    nothing                                                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Dinesh Annayya, dinesha@opencores.org                 ////
////                                                              ////
////  Revision :                                                  ////
////    0.0 - 11th Oct 2021, Dinesh A                             ////
////          Initial integration 
////                                                              ////
//////////////////////////////////////////////////////////////////////

`include "mbist_def.svh"
module mbist_top (

	input logic                      bist_clk,
	input logic                      rst_n,

	// MBIST I/F
	input  logic                     bist_en,
	input logic                      bist_run,
	input logic                      bist_shift,
	input logic                      bist_load,
	input logic                      bist_sdi,

	output logic                     bist_done,
	output logic                     bist_sdo,

      // FUNCTIONAL A PORT 
        input   logic                    func_clk_a,
        input   logic                    func_cen_a,
        input   logic  [BIST_ADDR_WD-1:0]func_addr_a,
        output  logic  [BIST_DATA_WD-1:0]func_dout_a,

       // Functional B Port
        input   logic                    func_clk_b,
        input   logic                    func_cen_b,
        input   logic                    func_web_b,
        input   logic [BIST_DATA_WD/8-1:0]func_mask_b,
        input   logic  [BIST_ADDR_WD-1:0]func_addr_b,
        input   logic  [BIST_DATA_WD-1:0]func_din_b,


     // towards memory
     // PORT-A
        output logic                     mem_clk_a,
        output logic   [BIST_ADDR_WD-1:0]mem_addr_a,
        output logic                     mem_cen_a,
        output logic   [BIST_DATA_WD-1:0]mem_din_b,
     // PORT-B
        output logic                     mem_clk_b,
        output logic                     mem_cen_b,
        output logic                     mem_web_b,
        output logic [BIST_DATA_WD/8-1:0]mem_mask_b,
        output logic   [BIST_ADDR_WD-1:0]mem_addr_b,
        input  logic   [BIST_DATA_WD-1:0]mem_dout_a


);

//----------------------------------------------------
// Local variable defination
// ---------------------------------------------------
//
logic                    cmd_phase  ;  // Command Phase
logic                    cmp_phase  ;  // Compare Phase
logic                    run_op     ;  // Run next Operation
logic                    run_addr   ;  // Run Next Address
logic                    run_sti    ;  // Run Next Stimulus
logic                    run_pat    ;  // Run Next Pattern
logic                    op_updown  ;  // Adress updown direction
logic                    last_addr  ;  // last address indication
logic                    last_sti   ;  // last stimulus
logic                    last_op    ;  // last operation
logic                    last_pat   ;  // last pattern
logic [BIST_DATA_WD-1:0] pat_data   ;  // Selected Data Pattern
logic [BIST_STI_WD-1:0]  stimulus   ;  // current stimulus
logic                    compare    ;  // compare data

//---------------------------------
// SDI => SDO diasy chain
// bist_sdi => bist_addr_sdo =>  bist_sti_sdo =>  bist_op_sdo => bist_pat_sdo
// ---------------------------------
logic                    bist_addr_sdo   ;                 
logic                    bist_sti_sdo    ;                 
logic                    bist_op_sdo     ;                 
logic                    bist_pat_sdo    ;                 

logic                    bist_error      ;
logic                    bist_error_fix  ;
logic                    bist_correct    ;
logic  [BIST_ADDR_WD-1:0]bist_error_addr ; // bist address

logic  [BIST_ADDR_WD-1:0]bist_addr       ; // bist address
logic [BIST_DATA_WD-1:0] bist_wdata      ; // bist write data
logic                    bist_wr         ;
logic                    bist_rd         ;

assign bist_wr = (cmd_phase && op_write);
assign bist_rd = (cmd_phase && op_read);

assign compare    = (cmp_phase && op_read);
assign bist_wdata = (op_invert) ? ~pat_data : pat_data;

// bist main control FSM

mbist_fsm u_fsm (

	            .cmd_phase          (cmd_phase           ),
	            .cmp_phase          (cmp_phase           ),
	            .run_op             (run_op             ),
	            .run_addr           (run_addr           ),
	            .run_sti            (run_sti            ),
	            .run_pat            (run_pat            ),
	            .bist_done          (bist_done          ),


	            .clk                (bist_clk           ),
	            .rst_n              (rst_n              ),
	            .bist_run           (bist_run           ),
	            .last_op            (last_op            ),
	            .last_addr          (last_addr          ),
	            .last_sti           (last_sti           ),
	            .last_pat           (last_pat           ),
		    .op_reverse         (op_reverse         ),
		    .bist_error         (bist_error         )
);


// bist address generation
mbist_addr_gen   u_addr_gen(
                    .last_addr          (last_addr          ), 
                    .bist_addr          (bist_addr          ),   
                    .sdo                (bist_addr_sdo      ),         

                    .clk                (bist_clk           ),         
                    .rst_n              (rst_n              ),       
                    .run                (run_addr           ),         
                    .updown             (op_updown          ),      
                    .scan_shift         (bist_shift         ),  
                    .scan_load          (bist_load          ),   
                    .sdi                (bist_sdi           )

);


// BIST current stimulus selection
mbist_sti_sel u_sti_sel(

	            .sdo                (bist_sti_sdo       ),  
	            .last_stimulus      (last_sti           ),  
                    .stimulus           (stimulus           ),

	            .clk                (bist_clk           ),  
	            .rst_n              (rst_n              ),  
	            .scan_shift         (bist_shift         ),  
	            .sdi                (bist_addr_sdo      ),  
	            .run                (run_sti            )              

);


// Bist Operation selection
mbist_op_sel u_op_sel (

                    .op_read            (op_read            ), 
	            .op_write           (op_write           ),
	            .op_invert          (op_invert          ),
	            .op_updown          (op_updown          ),
	            .op_reverse         (op_reverse         ),
	            .op_repeatflag      (op_repeatflag      ),
	            .sdo                (bist_op_sdo        ),
	            .last_op            (last_op            ),

	            .clk                (bist_clk           ),
	            .rst_n              (rst_n              ),
	            .scan_shift         (bist_shift         ),
	            .sdi                (bist_sti_sdo       ),
	            .run                (run_op             ),
                    .stimulus           (stimulus           )

    );


mbist_pat_sel u_pat_sel (
                    .pat_last           (last_pat           ),
                    .pat_data           (pat_data           ),
                    .sdo                (bist_pat_sdo       ),
                    .clk                (bist_clk           ),
                    .rst_n              (rst_n              ),
                    .run                (run_pat            ),
                    .scan_shift         (scan_shift         ),
                    .sdi                (bist_sdo           )

   );


mbist_data_cmp  u_cmp (
                    .error              (bist_error         ),
		    .error_fix          (bist_error_fix     ),
		    .error_addr         (bist_error_addr    ),
                    .clk                (bist_clk           ),
                    .rst_n              (rst_n              ),
                    .compare            (compare            ), 
	            .read_invert        (op_invert          ),
                    .comp_data          (pat_data           ),
                    .rxd_data           (func_dout_a        ),
		    .addr               (bist_addr          )
	     
	);


mbist_mux  u_mem_sel (

                    .rst_n                (rst_n         ),
                    // MBIST CTRL SIGNAL
                    .bist_en              (bist_en       ),
                    .bist_addr            (bist_addr     ),
                    .bist_wdata           (bist_wdata    ),
                    .bist_clk             (mem_clk       ),
                    .bist_wr              (bist_wr       ),
                    .bist_rd              (bist_rd       ),
                    .bist_error           (bist_error_fix),
                    .bist_error_addr      (bist_error_addr),
                    .bist_correct         (bist_correct  ),

                    // FUNCTIONAL CTRL SIGNAL
                    .func_clk_a          (func_clk_a     ),
                    .func_cen_a          (func_cen_a     ),
                    .func_addr_a         (func_addr_a    ),
                    // Common for func and Mbist i/f
                    .func_dout_a         (func_dout_a    ),

                    .func_clk_b          (func_clk_b     ),
                    .func_cen_b          (func_cen_b     ),
	            .func_web_b          (func_web_b     ),
	            .func_mask_b         (func_mask_b    ),
                    .func_addr_b         (func_addr_b    ),
                    .func_din_b          (func_din_b     ),


                    // towards memory
                    // Memory Out Port
                    .mem_clk_a           (mem_clk_a      ),
                    .mem_cen_a           (mem_cen_a      ),
                    .mem_addr_a          (mem_addr_a     ),
                    .mem_dout_a          (mem_dout_a     ),

                    // Memory Input Port
                    .mem_clk_b           (mem_clk_b      ),
                    .mem_cen_b           (mem_cen_b      ),
                    .mem_web_b           (mem_web_b      ),
                    .mem_mask_b          (mem_mask_b     ),
                    .mem_addr_b          (mem_addr_b     ),
                    .mem_din_b           (mem_din_b      )
    );


endmodule