//////////////////////////////////////////////////////////////////////////////
// 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: Dinesh Annayya <dinesha@opencores.org>
// //////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  yifive Wishbone interface for syntacore                     ////
////                                                              ////
////  This file is part of the yifive cores project               ////
////  https://github.com/dineshannayya/yifive_r0.git              ////
////  http://www.opencores.org/cores/yifive/                      ////
////                                                              ////
////  Description:                                                ////
////     integrated wishbone i/f to instruction/data memory       ////
////                                                              ////
////  To Do:                                                      ////
////    nothing                                                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Dinesh Annayya, dinesha@opencores.org                 ////
////                                                              ////
////  Revision :                                                  ////
////     v0:    June 7, 2021, Dinesh A                            ////
////             wishbone integration                             ////
////     v1:    June 17, 2021, Dinesh A                           ////
////             core and wishbone clock domain are seperated     ////
////             Async fifo added in imem and dmem path           ////
////     v2:    July 7, 2021, Dinesh A                            ////
////            64bit debug signal added                          ////
////     v3:    Aug 23, 2021, Dinesh A                            ////
////            timer_irq connective bug fix                      ////
////     v3:    Nov 12, 2021, Dinesh A                            ////
////            2KB SRAM Integrated at TCM Interface              ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//     Orginal owner Details                                      ////
//////////////////////////////////////////////////////////////////////
/// Copyright by Syntacore LLC © 2016-2020. See LICENSE for details///
/// @file       <scr1_top_wb.sv>                                   ///
/// @brief      SCR1 AHB top                                       ///
//////////////////////////////////////////////////////////////////////

`include "scr1_arch_description.svh"
`include "scr1_memif.svh"
`include "scr1_wb.svh"
`ifdef SCR1_IPIC_EN
`include "scr1_ipic.svh"
`endif // SCR1_IPIC_EN

`ifdef SCR1_TCM_EN
 `define SCR1_IMEM_ROUTER_EN
`endif // SCR1_TCM_EN

module scr1_top_wb (

`ifdef USE_POWER_PINS
         input logic            vccd1,    // User area 1 1.8V supply
         input logic            vssd1,    // User area 1 digital ground
`endif
    input  logic   [3:0]                 cfg_cska_riscv,
    input  logic                         wbd_clk_int,
    output logic                         wbd_clk_riscv,

    // Control
    input   logic                                   pwrup_rst_n,            // Power-Up Reset
    input   logic                                   rst_n,                  // Regular Reset signal
    input   logic                                   cpu_rst_n,              // CPU Reset (Core Reset)
    // input   logic                                   test_mode,              // Test mode - unused
    // input   logic                                   test_rst_n,             // Test mode's reset - unused
    input   logic                                   core_clk,               // Core clock
    input   logic                                   rtc_clk,                // Real-time clock
    output  logic [63:0]                            riscv_debug,
`ifdef SCR1_DBG_EN
    output  logic                                   sys_rst_n_o,            // External System Reset output
                                                                            //   (for the processor cluster's components or
                                                                            //    external SOC (could be useful in small
                                                                            //    SCR-core-centric SOCs))
    output  logic                                   sys_rdc_qlfy_o,         // System-to-External SOC Reset Domain Crossing Qualifier
`endif // SCR1_DBG_EN

    // Fuses
    input   logic [`SCR1_XLEN-1:0]                  fuse_mhartid,           // Hart ID
`ifdef SCR1_DBG_EN
    input   logic [31:0]                            fuse_idcode,            // TAPC IDCODE
`endif // SCR1_DBG_EN

    // IRQ
`ifdef SCR1_IPIC_EN
    input   logic [SCR1_IRQ_LINES_NUM-1:0]          irq_lines,              // IRQ lines to IPIC
`else // SCR1_IPIC_EN
    input   logic                                   ext_irq,                // External IRQ input
`endif // SCR1_IPIC_EN
    input   logic                                   soft_irq,               // Software IRQ input

`ifdef SCR1_DBG_EN
    // -- JTAG I/F
    input   logic                                   trst_n,
    input   logic                                   tck,
    input   logic                                   tms,
    input   logic                                   tdi,
    output  logic                                   tdo,
    output  logic                                   tdo_en,
`endif // SCR1_DBG_EN

`ifndef SCR1_TCM_MEM
    // SRAM-0 PORT-0
    output  logic                           sram0_clk0,
    output  logic                           sram0_csb0,
    output  logic                           sram0_web0,
    output  logic   [8:0]                   sram0_addr0,
    output  logic   [3:0]                   sram0_wmask0,
    output  logic   [31:0]                  sram0_din0,
    input   logic   [31:0]                  sram0_dout0,

    // SRAM-0 PORT-1
    output  logic                           sram0_clk1,
    output  logic                           sram0_csb1,
    output  logic  [8:0]                    sram0_addr1,
    input   logic  [31:0]                   sram0_dout1,

    // SRAM-1 PORT-0
    output  logic                           sram1_clk0,
    output  logic                           sram1_csb0,
    output  logic                           sram1_web0,
    output  logic   [8:0]                   sram1_addr0,
    output  logic   [3:0]                   sram1_wmask0,
    output  logic   [31:0]                  sram1_din0,
    input   logic   [31:0]                  sram1_dout0,

    // SRAM-1 PORT-1
    output  logic                           sram1_clk1,
    output  logic                           sram1_csb1,
    output  logic  [8:0]                    sram1_addr1,
    input   logic  [31:0]                   sram1_dout1,
`endif


    input   logic                           wb_rst_n,       // Wish bone reset
    input   logic                           wb_clk,         // wish bone clock
    // Instruction Memory Interface
    output  logic                           wbd_imem_stb_o, // strobe/request
    output  logic   [SCR1_WB_WIDTH-1:0]     wbd_imem_adr_o, // address
    output  logic                           wbd_imem_we_o,  // write
    output  logic   [SCR1_WB_WIDTH-1:0]     wbd_imem_dat_o, // data output
    output  logic   [3:0]                   wbd_imem_sel_o, // byte enable
    input   logic   [SCR1_WB_WIDTH-1:0]     wbd_imem_dat_i, // data input
    input   logic                           wbd_imem_ack_i, // acknowlegement
    input   logic                           wbd_imem_err_i,  // error

    // Data Memory Interface
    output  logic                           wbd_dmem_stb_o, // strobe/request
    output  logic   [SCR1_WB_WIDTH-1:0]     wbd_dmem_adr_o, // address
    output  logic                           wbd_dmem_we_o,  // write
    output  logic   [SCR1_WB_WIDTH-1:0]     wbd_dmem_dat_o, // data output
    output  logic   [3:0]                   wbd_dmem_sel_o, // byte enable
    input   logic   [SCR1_WB_WIDTH-1:0]     wbd_dmem_dat_i, // data input
    input   logic                           wbd_dmem_ack_i, // acknowlegement
    input   logic                           wbd_dmem_err_i  // error
);

//-------------------------------------------------------------------------------
// Local parameters
//-------------------------------------------------------------------------------
localparam int unsigned SCR1_CLUSTER_TOP_RST_SYNC_STAGES_NUM            = 2;

//-------------------------------------------------------------------------------
// Local signal declaration
//-------------------------------------------------------------------------------
// Reset logic
logic                                               test_mode;              // Test mode - unused
logic                                               test_rst_n;             // Test mode's reset - unused
logic                                               pwrup_rst_n_sync;
logic                                               rst_n_sync;
logic                                               cpu_rst_n_sync;
logic                                               core_rst_n_local;
`ifdef SCR1_DBG_EN
logic                                               tapc_trst_n;
`endif // SCR1_DBG_EN

// Instruction memory interface from core to router
logic                                               core_imem_req_ack;
logic                                               core_imem_req;
logic                                               core_imem_cmd;
logic [`SCR1_IMEM_AWIDTH-1:0]                       core_imem_addr;
logic [`SCR1_IMEM_DWIDTH-1:0]                       core_imem_rdata;
logic [1:0]                                         core_imem_resp;

// Data memory interface from core to router
logic                                               core_dmem_req_ack;
logic                                               core_dmem_req;
logic                                               core_dmem_cmd;
logic [1:0]                                         core_dmem_width;
logic [`SCR1_DMEM_AWIDTH-1:0]                       core_dmem_addr;
logic [`SCR1_DMEM_DWIDTH-1:0]                       core_dmem_wdata;
logic [`SCR1_DMEM_DWIDTH-1:0]                       core_dmem_rdata;
logic [1:0]                                         core_dmem_resp;

// Instruction memory interface from router to WB bridge
logic                                               wb_imem_req_ack;
logic                                               wb_imem_req;
logic                                               wb_imem_cmd;
logic [`SCR1_IMEM_AWIDTH-1:0]                       wb_imem_addr;
logic [`SCR1_IMEM_DWIDTH-1:0]                       wb_imem_rdata;
logic [1:0]                                         wb_imem_resp;

// Data memory interface from router to WB bridge
logic                                               wb_dmem_req_ack;
logic                                               wb_dmem_req;
logic                                               wb_dmem_cmd;
logic [1:0]                                         wb_dmem_width;
logic [`SCR1_DMEM_AWIDTH-1:0]                       wb_dmem_addr;
logic [`SCR1_DMEM_DWIDTH-1:0]                       wb_dmem_wdata;
logic [`SCR1_DMEM_DWIDTH-1:0]                       wb_dmem_rdata;
logic [1:0]                                         wb_dmem_resp;

`ifdef SCR1_TCM_EN
// Instruction memory interface from router to TCM
logic                                               tcm_imem_req_ack;
logic                                               tcm_imem_req;
logic                                               tcm_imem_cmd;
logic [`SCR1_IMEM_AWIDTH-1:0]                       tcm_imem_addr;
logic [`SCR1_IMEM_DWIDTH-1:0]                       tcm_imem_rdata;
logic [1:0]                                         tcm_imem_resp;

// Data memory interface from router to TCM
logic                                               tcm_dmem_req_ack;
logic                                               tcm_dmem_req;
logic                                               tcm_dmem_cmd;
logic [1:0]                                         tcm_dmem_width;
logic [`SCR1_DMEM_AWIDTH-1:0]                       tcm_dmem_addr;
logic [`SCR1_DMEM_DWIDTH-1:0]                       tcm_dmem_wdata;
logic [`SCR1_DMEM_DWIDTH-1:0]                       tcm_dmem_rdata;
logic [1:0]                                         tcm_dmem_resp;
`endif // SCR1_TCM_EN

// Data memory interface from router to memory-mapped timer
logic                                               timer_dmem_req_ack;
logic                                               timer_dmem_req;
logic                                               timer_dmem_cmd;
logic [1:0]                                         timer_dmem_width;
logic [`SCR1_DMEM_AWIDTH-1:0]                       timer_dmem_addr;
logic [`SCR1_DMEM_DWIDTH-1:0]                       timer_dmem_wdata;
logic [`SCR1_DMEM_DWIDTH-1:0]                       timer_dmem_rdata;
logic [1:0]                                         timer_dmem_resp;

logic                                               timer_irq;
logic [63:0]                                        timer_val;
logic [48:0]                                        core_debug;

// riscv clock skew control
clk_skew_adjust u_skew_riscv
       (
`ifdef USE_POWER_PINS
               .vccd1      (vccd1                      ),// User area 1 1.8V supply
               .vssd1      (vssd1                      ),// User area 1 digital ground
`endif
	       .clk_in     (wbd_clk_int                ), 
	       .sel        (cfg_cska_riscv             ), 
	       .clk_out    (wbd_clk_riscv              ) 
       );
//-------------------------------------------------------------------------------
// SCR1 Intf instance
//-------------------------------------------------------------------------------
scr1_intf u_intf (
    // Control
    .pwrup_rst_n                        (pwrup_rst_n),        // Power-Up Reset
    .rst_n                              (rst_n),              // Regular Reset signal
    .cpu_rst_n                          (cpu_rst_n),          // CPU Reset (Core Reset)
    .core_clk                           (core_clk),           // Core clock
    .rtc_clk                            (rtc_clk),            // Real-time clock
    .riscv_debug                        (riscv_debug),

`ifdef SCR1_DBG_EN
    // -- JTAG I/F
    .trst_n                             (trst_n),
`endif // SCR1_DBG_EN

`ifndef SCR1_TCM_MEM
    // SRAM-0 PORT-0
    .sram0_clk0      (sram0_clk0),
    .sram0_csb0      (sram0_csb0),
    .sram0_web0      (sram0_web0),
    .sram0_addr0     (sram0_addr0),
    .sram0_wmask0    (sram0_wmask0),
    .sram0_din0      (sram0_din0),
    .sram0_dout0     (sram0_dout0),
    
    // SRAM-0 PORT-1
    .sram0_clk1      (sram0_clk1),
    .sram0_csb1      (sram0_csb1),
    .sram0_addr1     (sram0_addr1),
    .sram0_dout1     (sram0_dout1),
    
    // SRAM-1 PORT-0
    .sram1_clk0      (sram1_clk0),
    .sram1_csb0      (sram1_csb0),
    .sram1_web0      (sram1_web0),
    .sram1_addr0     (sram1_addr0),
    .sram1_wmask0    (sram1_wmask0),
    .sram1_din0      (sram1_din0),
    .sram1_dout0     (sram1_dout0),
    
    // SRAM-1 PORT-1
    .sram1_clk1      (sram1_clk1),
    .sram1_csb1      (sram1_csb1),
    .sram1_addr1     (sram1_addr1),
    .sram1_dout1     (sram1_dout1),
`endif

    .wb_rst_n                           (wb_rst_n),           // Wish bone reset
    .wb_clk                             (wb_clk),             // wish bone clock

    // Instruction Memory Interface
    .wbd_imem_stb_o                     (wbd_imem_stb_o),     // strobe/request
    .wbd_imem_adr_o                     (wbd_imem_adr_o),     // address
    .wbd_imem_we_o                      (wbd_imem_we_o),      // write
    .wbd_imem_dat_o                     (wbd_imem_dat_o),     // data output
    .wbd_imem_sel_o                     (wbd_imem_sel_o),     // byte enable
    .wbd_imem_dat_i                     (wbd_imem_dat_i),     // data input
    .wbd_imem_ack_i                     (wbd_imem_ack_i),     // acknowlegement
    .wbd_imem_err_i                     (wbd_imem_err_i),     // error

    // Data Memory Interface
    .wbd_dmem_stb_o                     (wbd_dmem_stb_o),     // strobe/request
    .wbd_dmem_adr_o                     (wbd_dmem_adr_o),     // address
    .wbd_dmem_we_o                      (wbd_dmem_we_o),      // write
    .wbd_dmem_dat_o                     (wbd_dmem_dat_o),     // data output
    .wbd_dmem_sel_o                     (wbd_dmem_sel_o),     // byte enable
    .wbd_dmem_dat_i                     (wbd_dmem_dat_i),     // data input
    .wbd_dmem_ack_i                     (wbd_dmem_ack_i),     // acknowlegement
    .wbd_dmem_err_i                     (wbd_dmem_err_i),     // error

    // Common
    .pwrup_rst_n_sync                   (pwrup_rst_n_sync),   // Power-Up reset
    .rst_n_sync                         (rst_n_sync),         // Regular reset
    .cpu_rst_n_sync                     (cpu_rst_n_sync),     // CPU reset
    .test_mode                          (test_mode),          // DFT Test Mode
    .test_rst_n                         (test_rst_n),         // DFT Test Reset
    .core_rst_n_local                   (core_rst_n_local),   // Core reset
    .core_debug                         (core_debug  ),
`ifdef SCR1_DBG_EN
    // Debug Interface
    .tapc_trst_n                        (tapc_trst_n),        // Test Reset (TRSTn)
`endif
    // Memory-mapped external timer
    .timer_val                          (timer_val),          // Machine timer value
    .timer_irq                          (timer_irq),          // Machine timer value
    // Instruction Memory Interface
    .core_imem_req_ack                  (core_imem_req_ack),  // IMEM request acknowledge
    .core_imem_req                      (core_imem_req),      // IMEM request
    .core_imem_cmd                      (core_imem_cmd),      // IMEM command
    .core_imem_addr                     (core_imem_addr),     // IMEM address
    .core_imem_rdata                    (core_imem_rdata),    // IMEM read data
    .core_imem_resp                     (core_imem_resp),     // IMEM response

    // Data Memory Interface
    .core_dmem_req_ack                  (core_dmem_req_ack),  // DMEM request acknowledge
    .core_dmem_req                      (core_dmem_req),      // DMEM request
    .core_dmem_cmd                      (core_dmem_cmd),      // DMEM command
    .core_dmem_width                    (core_dmem_width),    // DMEM data width
    .core_dmem_addr                     (core_dmem_addr),     // DMEM address
    .core_dmem_wdata                    (core_dmem_wdata),    // DMEM write data
    .core_dmem_rdata                    (core_dmem_rdata),    // DMEM read data
    .core_dmem_resp                     (core_dmem_resp)      // DMEM response

);


//-------------------------------------------------------------------------------
// SCR1 core instance
//-------------------------------------------------------------------------------
scr1_core_top i_core_top (
    // Common
    .pwrup_rst_n                (pwrup_rst_n_sync ),
    .rst_n                      (rst_n_sync       ),
    .cpu_rst_n                  (cpu_rst_n_sync   ),
    .test_mode                  (test_mode        ),
    .test_rst_n                 (test_rst_n       ),
    .clk                        (core_clk         ),
    .core_rst_n_o               (core_rst_n_local ),
    .core_rdc_qlfy_o            (                 ),
    .core_debug                 (core_debug       ),
`ifdef SCR1_DBG_EN
    .sys_rst_n_o                (sys_rst_n_o      ),
    .sys_rdc_qlfy_o             (sys_rdc_qlfy_o   ),
`endif // SCR1_DBG_EN

    // Fuses
    .core_fuse_mhartid_i        (fuse_mhartid     ),
`ifdef SCR1_DBG_EN
    .tapc_fuse_idcode_i         (fuse_idcode      ),
`endif // SCR1_DBG_EN

    // IRQ
`ifdef SCR1_IPIC_EN
    .core_irq_lines_i           (irq_lines        ),
`else // SCR1_IPIC_EN
    .core_irq_ext_i             (ext_irq          ),
`endif // SCR1_IPIC_EN
    .core_irq_soft_i            (soft_irq         ),
    .core_irq_mtimer_i          (timer_irq        ),

    // Memory-mapped external timer
    .core_mtimer_val_i          (timer_val        ),

`ifdef SCR1_DBG_EN
    // Debug interface
    .tapc_trst_n                (tapc_trst_n      ),
    .tapc_tck                   (tck              ),
    .tapc_tms                   (tms              ),
    .tapc_tdi                   (tdi              ),
    .tapc_tdo                   (tdo              ),
    .tapc_tdo_en                (tdo_en           ),
`endif // SCR1_DBG_EN

    // Instruction memory interface
    .imem2core_req_ack_i        (core_imem_req_ack),
    .core2imem_req_o            (core_imem_req    ),
    .core2imem_cmd_o            (core_imem_cmd    ),
    .core2imem_addr_o           (core_imem_addr   ),
    .imem2core_rdata_i          (core_imem_rdata  ),
    .imem2core_resp_i           (core_imem_resp   ),

    // Data memory interface
    .dmem2core_req_ack_i        (core_dmem_req_ack),
    .core2dmem_req_o            (core_dmem_req    ),
    .core2dmem_cmd_o            (core_dmem_cmd    ),
    .core2dmem_width_o          (core_dmem_width  ),
    .core2dmem_addr_o           (core_dmem_addr   ),
    .core2dmem_wdata_o          (core_dmem_wdata  ),
    .dmem2core_rdata_i          (core_dmem_rdata  ),
    .dmem2core_resp_i           (core_dmem_resp   )
);


endmodule : scr1_top_wb