////////////////////////////////////////////////////////////////////////////
// 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: Modified by Dinesh Annayya <dinesha@opencores.org>
//////////////////////////////////////////////////////////////////////
////                                                              ////
////  Standalone User validation Test bench                       ////
////                                                              ////
////  This file is part of the YIFive cores project               ////
////  https://github.com/dineshannayya/yifive_r0.git              ////
////                                                              ////
////  Description                                                 ////
////   This is a standalone test bench to validate the            ////
////   i2c Master .                                               ////
////                                                              ////
////  To Do:                                                      ////
////    nothing                                                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Dinesh Annayya, dinesha@opencores.org                 ////
////                                                              ////
////  Revision :                                                  ////
////    0.1 - 16th Feb 2021, Dinesh A                             ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// 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                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////

`default_nettype wire

`timescale 1 ns / 1 ns

`include "s25fl256s.sv"
`include "uprj_netlists.v"
`include "mt48lc8m8a2.v"
`include "i2c_slave_model.v"


`define ADDR_SPACE_UART  32'h3001_0000
`define ADDR_SPACE_I2CM  32'h3001_0000


module tb_top;

reg            clock         ;
reg            wb_rst_i      ;
reg            power1, power2;
reg            power3, power4;

reg            wbd_ext_cyc_i;  // strobe/request
reg            wbd_ext_stb_i;  // strobe/request
reg [31:0]     wbd_ext_adr_i;  // address
reg            wbd_ext_we_i;  // write
reg [31:0]     wbd_ext_dat_i;  // data output
reg [3:0]      wbd_ext_sel_i;  // byte enable

wire [31:0]    wbd_ext_dat_o;  // data input
wire           wbd_ext_ack_o;  // acknowlegement
wire           wbd_ext_err_o;  // error

// User I/O
wire [37:0]    io_oeb        ;
wire [37:0]    io_out        ;
wire [37:0]    io_in         ;

wire [37:0]    mprj_io       ;
wire [7:0]     mprj_io_0     ;
reg            test_fail     ;
reg [31:0]     read_data     ;
//----------------------------------
// Uart Configuration
// ---------------------------------

integer i,j;

	// External clock is used by default.  Make this artificially fast for the
	// simulation.  Normally this would be a slow clock and the digital PLL
	// would be the fast clock.

	always #12.5 clock <= (clock === 1'b0);

	initial begin
		clock = 0;
                wbd_ext_cyc_i ='h0;  // strobe/request
                wbd_ext_stb_i ='h0;  // strobe/request
                wbd_ext_adr_i ='h0;  // address
                wbd_ext_we_i  ='h0;  // write
                wbd_ext_dat_i ='h0;  // data output
                wbd_ext_sel_i ='h0;  // byte enable
	end

	`ifdef WFDUMP
	   initial begin
	   	$dumpfile("tb_top.vcd");
	   	$dumpvars(0, tb_top);
	   end
       `endif

	initial begin
		wb_rst_i <= 1'b1;
		#100;
		wb_rst_i <= 1'b0;	    	// Release reset
	end
initial
begin
   test_fail = 0;

   #200; // Wait for reset removal
   repeat (10) @(posedge clock);
   $display("############################################");
   $display("   Testing I2CM Read/Write Access           ");
   $display("############################################");
   

   repeat (10) @(posedge clock);
   #1;
   // Enable I2M Block & WB Reset and Enable I2CM Mux Select
   wb_user_core_write('h3080_0000,'hA1);

   repeat (100) @(posedge clock);  

    @(posedge  clock);
    $display("---------- Initialize I2C Master ----------"); 

    //Wrire Prescale registers
     wb_user_core_write(`ADDR_SPACE_I2CM+(8'h0<<2),8'hC7);  
     wb_user_core_write(`ADDR_SPACE_I2CM+(8'h1<<2),8'h00);  
    // Core Enable
     wb_user_core_write(`ADDR_SPACE_I2CM+(8'h2<<2),8'h80);  
    
    // Writing Data

    $display("---------- Writing Data ----------"); 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h20); // Slave Addr + WR  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h90);  
    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  
     
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h66);  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h10);  

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  
   
   /* Byte1: 12 */ 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h12);  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h10); // No Stop + Write  

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  
   
   /* Byte1: 34 */ 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h34);  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h10); // No Stop + Write 

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  

   /* Byte1: 56 */ 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h56);  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h10); // No Stop + Write 

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  

   /* Byte1: 78 */ 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h78);  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h50); // Stop + Write 

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  

    //Reading Data
    
    //Wrire Address
    $display("---------- Writing Data ----------"); 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h20);  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h90);  
    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  
     
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h66);  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h50);  

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  

    //Generate Read
    $display("---------- Writing Data ----------"); 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h3<<2),8'h21); // Slave Addr + RD  
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h90);  
    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  

    /* BYTE-1 : 0x12  */ 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h20);  // RD + ACK

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  

    //Compare received data
    wb_user_core_read_cmp(`ADDR_SPACE_I2CM+(8'h3<<2),8'h12);  
     
    /* BYTE-2 : 0x34  */ 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h20);  // RD + ACK

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  

    //Compare received data
    wb_user_core_read_cmp(`ADDR_SPACE_I2CM+(8'h3<<2),8'h34);  

    /* BYTE-3 : 0x56  */ 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4 <<2),8'h20);  // RD + ACK

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4<<2),read_data);  

    //Compare received data
    wb_user_core_read_cmp(`ADDR_SPACE_I2CM+(8'h3<<2),8'h56);  

    /* BYTE-4 : 0x78  */ 
    wb_user_core_write(`ADDR_SPACE_I2CM+(8'h4<<2),8'h68);  // STOP + RD + NACK 

    read_data[1] = 1'b1;
    while(read_data[1]==1)
      wb_user_core_read(`ADDR_SPACE_I2CM+(8'h4 <<2),read_data);  

    //Compare received data
    wb_user_core_read_cmp(`ADDR_SPACE_I2CM+(8'h3 <<2),8'h78);  

    repeat(100)@(posedge clock);


     $display("###################################################");
     if(test_fail == 0) begin
        `ifdef GL
            $display("Monitor: Standalone User I2M Test (GL) Passed");
        `else
            $display("Monitor: Standalone User I2M Test (RTL) Passed");
        `endif
     end else begin
         `ifdef GL
             $display("Monitor: Standalone User I2M Test (GL) Failed");
         `else
             $display("Monitor: Standalone User I2M Test (RTL) Failed");
         `endif
      end
     $display("###################################################");
     #100
     $finish;
end


wire USER_VDD1V8 = 1'b1;
wire VSS = 1'b0;


user_project_wrapper u_top(
`ifdef USE_POWER_PINS
    .vccd1(USER_VDD1V8),	// User area 1 1.8V supply
    .vssd1(VSS),	// User area 1 digital ground
`endif
    .wb_clk_i        (clock),  // System clock
    .user_clock2     (1'b1),  // Real-time clock
    .wb_rst_i        (wb_rst_i),  // Regular Reset signal

    .wbs_cyc_i   (wbd_ext_cyc_i),  // strobe/request
    .wbs_stb_i   (wbd_ext_stb_i),  // strobe/request
    .wbs_adr_i   (wbd_ext_adr_i),  // address
    .wbs_we_i    (wbd_ext_we_i),  // write
    .wbs_dat_i   (wbd_ext_dat_i),  // data output
    .wbs_sel_i   (wbd_ext_sel_i),  // byte enable

    .wbs_dat_o   (wbd_ext_dat_o),  // data input
    .wbs_ack_o   (wbd_ext_ack_o),  // acknowlegement

 
    // Logic Analyzer Signals
    .la_data_in      ('0) ,
    .la_data_out     (),
    .la_oenb         ('0),
 

    // IOs
    .io_in          (io_in)  ,
    .io_out         (io_out) ,
    .io_oeb         (io_oeb) ,

    .user_irq       () 

);

`ifndef GL // Drive Power for Hold Fix Buf
    // All standard cell need power hook-up for functionality work
    initial begin
	force u_top.u_spi_master.u_delay1_sdio0.VPWR =USER_VDD1V8;
	force u_top.u_spi_master.u_delay1_sdio0.VPB  =USER_VDD1V8;
	force u_top.u_spi_master.u_delay1_sdio0.VGND =VSS;
	force u_top.u_spi_master.u_delay1_sdio0.VNB = VSS;
	force u_top.u_spi_master.u_delay2_sdio0.VPWR =USER_VDD1V8;
	force u_top.u_spi_master.u_delay2_sdio0.VPB  =USER_VDD1V8;
	force u_top.u_spi_master.u_delay2_sdio0.VGND =VSS;
	force u_top.u_spi_master.u_delay2_sdio0.VNB = VSS;
	force u_top.u_spi_master.u_buf_sdio0.VPWR   =USER_VDD1V8;
	force u_top.u_spi_master.u_buf_sdio0.VPB    =USER_VDD1V8;
	force u_top.u_spi_master.u_buf_sdio0.VGND   =VSS;
	force u_top.u_spi_master.u_buf_sdio0.VNB    =VSS;

	force u_top.u_spi_master.u_delay1_sdio1.VPWR =USER_VDD1V8;
	force u_top.u_spi_master.u_delay1_sdio1.VPB  =USER_VDD1V8;
	force u_top.u_spi_master.u_delay1_sdio1.VGND =VSS;
	force u_top.u_spi_master.u_delay1_sdio1.VNB = VSS;
	force u_top.u_spi_master.u_delay2_sdio1.VPWR =USER_VDD1V8;
	force u_top.u_spi_master.u_delay2_sdio1.VPB  =USER_VDD1V8;
	force u_top.u_spi_master.u_delay2_sdio1.VGND =VSS;
	force u_top.u_spi_master.u_delay2_sdio1.VNB = VSS;
	force u_top.u_spi_master.u_buf_sdio1.VPWR   =USER_VDD1V8;
	force u_top.u_spi_master.u_buf_sdio1.VPB    =USER_VDD1V8;
	force u_top.u_spi_master.u_buf_sdio1.VGND   =VSS;
	force u_top.u_spi_master.u_buf_sdio1.VNB    =VSS;

	force u_top.u_spi_master.u_delay1_sdio2.VPWR =USER_VDD1V8;
	force u_top.u_spi_master.u_delay1_sdio2.VPB  =USER_VDD1V8;
	force u_top.u_spi_master.u_delay1_sdio2.VGND =VSS;
	force u_top.u_spi_master.u_delay1_sdio2.VNB = VSS;
	force u_top.u_spi_master.u_delay2_sdio2.VPWR =USER_VDD1V8;
	force u_top.u_spi_master.u_delay2_sdio2.VPB  =USER_VDD1V8;
	force u_top.u_spi_master.u_delay2_sdio2.VGND =VSS;
	force u_top.u_spi_master.u_delay2_sdio2.VNB = VSS;
	force u_top.u_spi_master.u_buf_sdio2.VPWR   =USER_VDD1V8;
	force u_top.u_spi_master.u_buf_sdio2.VPB    =USER_VDD1V8;
	force u_top.u_spi_master.u_buf_sdio2.VGND   =VSS;
	force u_top.u_spi_master.u_buf_sdio2.VNB    =VSS;

	force u_top.u_spi_master.u_delay1_sdio3.VPWR =USER_VDD1V8;
	force u_top.u_spi_master.u_delay1_sdio3.VPB  =USER_VDD1V8;
	force u_top.u_spi_master.u_delay1_sdio3.VGND =VSS;
	force u_top.u_spi_master.u_delay1_sdio3.VNB = VSS;
	force u_top.u_spi_master.u_delay2_sdio3.VPWR =USER_VDD1V8;
	force u_top.u_spi_master.u_delay2_sdio3.VPB  =USER_VDD1V8;
	force u_top.u_spi_master.u_delay2_sdio3.VGND =VSS;
	force u_top.u_spi_master.u_delay2_sdio3.VNB = VSS;
	force u_top.u_spi_master.u_buf_sdio3.VPWR   =USER_VDD1V8;
	force u_top.u_spi_master.u_buf_sdio3.VPB    =USER_VDD1V8;
	force u_top.u_spi_master.u_buf_sdio3.VGND   =VSS;
	force u_top.u_spi_master.u_buf_sdio3.VNB    =VSS;
          
	force u_top.u_uart_i2c_usb.u_uart_core.u_lineclk_buf.VPWR =USER_VDD1V8;
	force u_top.u_uart_i2c_usb.u_uart_core.u_lineclk_buf.VPB  =USER_VDD1V8;
	force u_top.u_uart_i2c_usb.u_uart_core.u_lineclk_buf.VGND =VSS;
	force u_top.u_uart_i2c_usb.u_uart_core.u_lineclk_buf.VNB = VSS;

	force u_top.u_wb_host.u_buf_wb_rst.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_wb_rst.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_wb_rst.VGND =VSS;
	force u_top.u_wb_host.u_buf_wb_rst.VNB = VSS;

	force u_top.u_wb_host.u_buf_cpu_rst.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_cpu_rst.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_cpu_rst.VGND =VSS;
	force u_top.u_wb_host.u_buf_cpu_rst.VNB = VSS;

	force u_top.u_wb_host.u_buf_spi_rst.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_spi_rst.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_spi_rst.VGND =VSS;
	force u_top.u_wb_host.u_buf_spi_rst.VNB = VSS;

	force u_top.u_wb_host.u_buf_sdram_rst.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_sdram_rst.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_sdram_rst.VGND =VSS;
	force u_top.u_wb_host.u_buf_sdram_rst.VNB = VSS;

	force u_top.u_wb_host.u_buf_uart_rst.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_uart_rst.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_uart_rst.VGND =VSS;
	force u_top.u_wb_host.u_buf_uart_rst.VNB = VSS;

	force u_top.u_wb_host.u_buf_i2cm_rst.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_i2cm_rst.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_i2cm_rst.VGND =VSS;
	force u_top.u_wb_host.u_buf_i2cm_rst.VNB = VSS;

	force u_top.u_wb_host.u_buf_usb_rst.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_usb_rst.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_buf_usb_rst.VGND =VSS;
	force u_top.u_wb_host.u_buf_usb_rst.VNB = VSS;

	force u_top.u_wb_host.u_clkbuf_sdram.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_clkbuf_sdram.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_clkbuf_sdram.VGND =VSS;
	force u_top.u_wb_host.u_clkbuf_sdram.VNB = VSS;

	force u_top.u_wb_host.u_clkbuf_cpu.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_clkbuf_cpu.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_clkbuf_cpu.VGND =VSS;
	force u_top.u_wb_host.u_clkbuf_cpu.VNB = VSS;

	force u_top.u_wb_host.u_clkbuf_rtc.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_clkbuf_rtc.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_clkbuf_rtc.VGND =VSS;
	force u_top.u_wb_host.u_clkbuf_rtc.VNB = VSS;

	force u_top.u_wb_host.u_clkbuf_usb.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_clkbuf_usb.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_clkbuf_usb.VGND =VSS;
	force u_top.u_wb_host.u_clkbuf_usb.VNB = VSS;

	force u_top.u_wb_host.u_sdram_ref_sel.u_mux.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_sdram_ref_sel.u_mux.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_sdram_ref_sel.u_mux.VGND =VSS;
	force u_top.u_wb_host.u_sdram_ref_sel.u_mux.VNB = VSS;

	force u_top.u_wb_host.u_sdram_clk_sel.u_mux.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_sdram_clk_sel.u_mux.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_sdram_clk_sel.u_mux.VGND =VSS;
	force u_top.u_wb_host.u_sdram_clk_sel.u_mux.VNB = VSS;

	force u_top.u_wb_host.u_cpu_ref_sel.u_mux.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_cpu_ref_sel.u_mux.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_cpu_ref_sel.u_mux.VGND =VSS;
	force u_top.u_wb_host.u_cpu_ref_sel.u_mux.VNB = VSS;

	force u_top.u_wb_host.u_cpu_clk_sel.u_mux.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_cpu_clk_sel.u_mux.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_cpu_clk_sel.u_mux.VGND =VSS;
	force u_top.u_wb_host.u_cpu_clk_sel.u_mux.VNB = VSS;

	force u_top.u_wb_host.u_wbs_clk_sel.u_mux.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_wbs_clk_sel.u_mux.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_wbs_clk_sel.u_mux.VGND =VSS;
	force u_top.u_wb_host.u_wbs_clk_sel.u_mux.VNB = VSS;

	force u_top.u_wb_host.u_usb_clk_sel.u_mux.VPWR =USER_VDD1V8;
	force u_top.u_wb_host.u_usb_clk_sel.u_mux.VPB  =USER_VDD1V8;
	force u_top.u_wb_host.u_usb_clk_sel.u_mux.VGND =VSS;
	force u_top.u_wb_host.u_usb_clk_sel.u_mux.VNB = VSS;
    end
`endif    
//------------------------------------------------------
//  Integrate the Serial flash with qurd support to
//  user core using the gpio pads
//  ----------------------------------------------------

   wire flash_clk = io_out[30];
   wire flash_csb = io_out[31];
   // Creating Pad Delay
   wire #1 io_oeb_32 = io_oeb[32];
   wire #1 io_oeb_33 = io_oeb[33];
   wire #1 io_oeb_34 = io_oeb[34];
   wire #1 io_oeb_35 = io_oeb[35];
   tri  flash_io0 = (io_oeb_32== 1'b0) ? io_out[32] : 1'bz;
   tri  flash_io1 = (io_oeb_33== 1'b0) ? io_out[33] : 1'bz;
   tri  flash_io2 = (io_oeb_34== 1'b0) ? io_out[34] : 1'bz;
   tri  flash_io3 = (io_oeb_35== 1'b0) ? io_out[35] : 1'bz;

   assign io_in[32] = flash_io0;
   assign io_in[33] = flash_io1;
   assign io_in[34] = flash_io2;
   assign io_in[35] = flash_io3;


   // Quard flash
     s25fl256s #(.mem_file_name("user_uart.hex"),
	         .otp_file_name("none"), 
                 .TimingModel("S25FL512SAGMFI010_F_30pF")) 
		 u_spi_flash_256mb
       (
           // Data Inputs/Outputs
       .SI      (flash_io0),
       .SO      (flash_io1),
       // Controls
       .SCK     (flash_clk),
       .CSNeg   (flash_csb),
       .WPNeg   (flash_io2),
       .HOLDNeg (flash_io3),
       .RSTNeg  (!wb_rst_i)

       );


//------------------------------------------------
// Integrate the SDRAM 8 BIT Memory
// -----------------------------------------------

wire [7:0]    Dq                 ; // SDRAM Read/Write Data Bus
wire [0:0]    sdr_dqm            ; // SDRAM DATA Mask
wire [1:0]    sdr_ba             ; // SDRAM Bank Select
wire [12:0]   sdr_addr           ; // SDRAM ADRESS
wire          sdr_cs_n           ; // chip select
wire          sdr_cke            ; // clock gate
wire          sdr_ras_n          ; // ras
wire          sdr_cas_n          ; // cas
wire          sdr_we_n           ; // write enable        
wire          sdram_clk         ;      

assign  Dq[7:0]           =  (io_oeb[7:0] == 8'h0) ? io_out [7:0] : 8'hZZ;
assign  sdr_addr[12:0]    =    io_out [20:8]     ;
assign  sdr_ba[1:0]       =    io_out [22:21]    ;
assign  sdr_dqm[0]        =    io_out [23]       ;
assign  sdr_we_n          =    io_out [24]       ;
assign  sdr_cas_n         =    io_out [25]       ;
assign  sdr_ras_n         =    io_out [26]       ;
assign  sdr_cs_n          =    io_out [27]       ;
assign  sdr_cke           =    io_out [28]       ;
assign  sdram_clk         =    io_out [29]       ;
assign  io_in[29]         =    sdram_clk;
assign  #(1) io_in[7:0]   =    Dq;

// to fix the sdram interface timing issue
wire #(1) sdram_clk_d   = sdram_clk;

	// SDRAM 8bit
mt48lc8m8a2 #(.data_bits(8)) u_sdram8 (
          .Dq                 (Dq                 ) , 
          .Addr               (sdr_addr[11:0]     ), 
          .Ba                 (sdr_ba             ), 
          .Clk                (sdram_clk_d        ), 
          .Cke                (sdr_cke            ), 
          .Cs_n               (sdr_cs_n           ), 
          .Ras_n              (sdr_ras_n          ), 
          .Cas_n              (sdr_cas_n          ), 
          .We_n               (sdr_we_n           ), 
          .Dqm                (sdr_dqm            )
     );


//---------------------------
//  UART Agent integration
// --------------------------
tri scl,sda;

assign scl   = (io_oeb[36] == 1'b0) ? io_out[36]: 1'bz;
assign sda  =  (io_oeb[37] == 1'b0) ? io_out[37] : 1'bz;
assign io_in[37]  =  sda;
assign io_in[36]  =  scl;

pullup p1(scl); // pullup scl line
pullup p2(sda); // pullup sda line

 
i2c_slave_model u_i2c_slave (
	.scl   (scl), 
	.sda   (sda)
       );


task wb_user_core_write;
input [31:0] address;
input [31:0] data;
begin
  repeat (1) @(posedge clock);
  #1;
  wbd_ext_adr_i =address;  // address
  wbd_ext_we_i  ='h1;  // write
  wbd_ext_dat_i =data;  // data output
  wbd_ext_sel_i ='hF;  // byte enable
  wbd_ext_cyc_i ='h1;  // strobe/request
  wbd_ext_stb_i ='h1;  // strobe/request
  wait(wbd_ext_ack_o == 1);
  repeat (1) @(posedge clock);
  #1;
  wbd_ext_cyc_i ='h0;  // strobe/request
  wbd_ext_stb_i ='h0;  // strobe/request
  wbd_ext_adr_i ='h0;  // address
  wbd_ext_we_i  ='h0;  // write
  wbd_ext_dat_i ='h0;  // data output
  wbd_ext_sel_i ='h0;  // byte enable
  $display("DEBUG WB USER ACCESS WRITE Address : %x, Data : %x",address,data);
  repeat (2) @(posedge clock);
end
endtask

task  wb_user_core_read;
input [31:0] address;
output [31:0] data;
reg    [31:0] data;
begin
  repeat (1) @(posedge clock);
  #1;
  wbd_ext_adr_i =address;  // address
  wbd_ext_we_i  ='h0;  // write
  wbd_ext_dat_i ='0;  // data output
  wbd_ext_sel_i ='hF;  // byte enable
  wbd_ext_cyc_i ='h1;  // strobe/request
  wbd_ext_stb_i ='h1;  // strobe/request
  wait(wbd_ext_ack_o == 1);
  data  = wbd_ext_dat_o;  
  repeat (1) @(posedge clock);
  #1;
  wbd_ext_cyc_i ='h0;  // strobe/request
  wbd_ext_stb_i ='h0;  // strobe/request
  wbd_ext_adr_i ='h0;  // address
  wbd_ext_we_i  ='h0;  // write
  wbd_ext_dat_i ='h0;  // data output
  wbd_ext_sel_i ='h0;  // byte enable
  //$display("DEBUG WB USER ACCESS READ Address : %x, Data : %x",address,data);
  repeat (2) @(posedge clock);
end
endtask

task  wb_user_core_read_cmp;
input [31:0] address;
input [31:0] cmp_data;
reg    [31:0] data;
begin
  repeat (1) @(posedge clock);
  #1;
  wbd_ext_adr_i =address;  // address
  wbd_ext_we_i  ='h0;  // write
  wbd_ext_dat_i ='0;  // data output
  wbd_ext_sel_i ='hF;  // byte enable
  wbd_ext_cyc_i ='h1;  // strobe/request
  wbd_ext_stb_i ='h1;  // strobe/request
  wait(wbd_ext_ack_o == 1);
  data  = wbd_ext_dat_o;  
  repeat (1) @(posedge clock);
  #1;
  wbd_ext_cyc_i ='h0;  // strobe/request
  wbd_ext_stb_i ='h0;  // strobe/request
  wbd_ext_adr_i ='h0;  // address
  wbd_ext_we_i  ='h0;  // write
  wbd_ext_dat_i ='h0;  // data output
  wbd_ext_sel_i ='h0;  // byte enable
  if(data === cmp_data) begin
     $display("STATUS: DEBUG WB USER ACCESS READ Address : %x, Data : %x",address,data);
  end else begin
     $display("ERROR: DEBUG WB USER ACCESS READ Address : %x, Exp Data : %x Rxd Data: ",address,cmp_data,data);
     test_fail= 1;
     #100
     $finish;
  end
  repeat (2) @(posedge clock);
end
endtask

`ifdef GL

wire        wbd_spi_stb_i   = u_top.u_spi_master.wbd_stb_i;
wire        wbd_spi_ack_o   = u_top.u_spi_master.wbd_ack_o;
wire        wbd_spi_we_i    = u_top.u_spi_master.wbd_we_i;
wire [31:0] wbd_spi_adr_i   = u_top.u_spi_master.wbd_adr_i;
wire [31:0] wbd_spi_dat_i   = u_top.u_spi_master.wbd_dat_i;
wire [31:0] wbd_spi_dat_o   = u_top.u_spi_master.wbd_dat_o;
wire [3:0]  wbd_spi_sel_i   = u_top.u_spi_master.wbd_sel_i;

wire        wbd_sdram_stb_i = u_top.u_sdram_ctrl.wb_stb_i;
wire        wbd_sdram_ack_o = u_top.u_sdram_ctrl.wb_ack_o;
wire        wbd_sdram_we_i  = u_top.u_sdram_ctrl.wb_we_i;
wire [31:0] wbd_sdram_adr_i = u_top.u_sdram_ctrl.wb_addr_i;
wire [31:0] wbd_sdram_dat_i = u_top.u_sdram_ctrl.wb_dat_i;
wire [31:0] wbd_sdram_dat_o = u_top.u_sdram_ctrl.wb_dat_o;
wire [3:0]  wbd_sdram_sel_i = u_top.u_sdram_ctrl.wb_sel_i;

wire        wbd_uart_stb_i  = u_top.u_uart_i2c.u_uart_core.reg_cs;
wire        wbd_uart_ack_o  = u_top.u_uart_i2c.u_uart_core.reg_ack;
wire        wbd_uart_we_i   = u_top.u_uart_i2c.u_uart_core.reg_wr;
wire [7:0]  wbd_uart_adr_i  = u_top.u_uart_i2c.u_uart_core.reg_addr;
wire [7:0]  wbd_uart_dat_i  = u_top.u_uart_i2c.u_uart_core.reg_wdata;
wire [7:0]  wbd_uart_dat_o  = u_top.u_uart_i2c.u_uart_core.reg_rdata;
wire        wbd_uart_sel_i  = u_top.u_uart_i2c.u_uart_core.reg_be;

`endif

/**
`ifdef GL
//-----------------------------------------------------------------------------
// RISC IMEM amd DMEM Monitoring TASK
//-----------------------------------------------------------------------------

`define RISC_CORE  user_uart_tb.u_top.u_core.u_riscv_top

always@(posedge `RISC_CORE.wb_clk) begin
    if(`RISC_CORE.wbd_imem_ack_i)
          $display("RISCV-DEBUG => IMEM ADDRESS: %x Read Data : %x", `RISC_CORE.wbd_imem_adr_o,`RISC_CORE.wbd_imem_dat_i);
    if(`RISC_CORE.wbd_dmem_ack_i && `RISC_CORE.wbd_dmem_we_o)
          $display("RISCV-DEBUG => DMEM ADDRESS: %x Write Data: %x Resonse: %x", `RISC_CORE.wbd_dmem_adr_o,`RISC_CORE.wbd_dmem_dat_o);
    if(`RISC_CORE.wbd_dmem_ack_i && !`RISC_CORE.wbd_dmem_we_o)
          $display("RISCV-DEBUG => DMEM ADDRESS: %x READ Data : %x Resonse: %x", `RISC_CORE.wbd_dmem_adr_o,`RISC_CORE.wbd_dmem_dat_i);
end

`endif
**/
endmodule
`default_nettype wire