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

//

//  XGATE Coprocessor - XGATE Top Level Module

//

//  Author: Robert Hayes

//          rehayes@opencores.org

//

//  Downloaded from: http://www.opencores.org/projects/xgate.....

//

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

// Copyright (c) 2009, Robert Hayes

//

// 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 3 of the License, or

// (at your option) any later version.

//

// Supplemental terms.

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * Neither the name of the <organization> nor the

//       names of its contributors may be used to endorse or promote products

//       derived from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY Robert Hayes ''AS IS'' AND ANY

// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

// DISCLAIMED. IN NO EVENT SHALL Robert Hayes 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.

//

// You should have received a copy of the GNU General Public License

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

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

// 45678901234567890123456789012345678901234567890123456789012345678901234567890

module xgate_top #(parameter ARST_LVL = 1'b0,      // asynchronous reset level

                   parameter SINGLE_CYCLE = 1'b0,  // 

                   parameter MAX_CHANNEL = 127,    // Max XGATE Interrupt Channel Number

                   parameter DWIDTH = 16)          // Data bus width

  (

  // Wishbone Slave Signals

  output    [DWIDTH-1:0] wbs_dat_o,     // databus output

  output                 wbs_ack_o,     // bus cycle acknowledge output

  input                  wbs_clk_i,     // master clock input

  input                  wbs_rst_i,     // synchronous active high reset

  input                  arst_i,        // asynchronous reset

  input            [4:0] wbs_adr_i,     // lower address bits

  input     [DWIDTH-1:0] wbs_dat_i,     // databus input

  input                  wbs_we_i,      // write enable input

  input                  wbs_stb_i,     // stobe/core select signal

  input                  wbs_cyc_i,     // valid bus cycle input

  input            [1:0] wbs_sel_i,     // Select byte in word bus transaction

  // Wishbone Master Signals

  output    [DWIDTH-1:0] wbm_dat_o,     // databus output

  output                 wbm_we_o,      // write enable output

  output                 wbm_stb_o,     // stobe/core select signal

  output                 wbm_cyc_o,     // valid bus cycle output

  output          [ 1:0] wbm_sel_o,     // Select byte in word bus transaction

  output          [15:0] wbm_adr_o,     // Address bits

  input     [DWIDTH-1:0] wbm_dat_i,     // databus input

  input                  wbm_ack_i,     // bus cycle acknowledge input

  // XGATE IO Signals

  output          [ 7:0] xgswt,         // XGATE Software Trigger Register

  output                 write_mem_strb_l, // Strobe for writing low data byte

  output                 write_mem_strb_h, // Strobe for writing high data bye

  output                 xg_sw_irq,        // Xgate Software interrupt

  output [MAX_CHANNEL:0] xgif,             // XGATE Interrupt Flag

  input  [MAX_CHANNEL:0] chan_req_i,       // XGATE Interrupt request

  input                  risc_clk,         // Clock for RISC core

  input                  debug_mode_i,     // Force RISC core into debug mode

  input                  secure_mode_i,    // Limit host asscess to Xgate RISC registers

  input                  scantestmode      // Chip in in scan test mode

  );

  wire        zero_flag;

  wire        negative_flag;

  wire        carry_flag;

  wire        overflow_flag;

  wire [15:0] xgr1;          // XGATE Register #1

  wire [15:0] xgr2;          // XGATE Register #2

  wire [15:0] xgr3;          // XGATE Register #3

  wire [15:0] xgr4;          // XGATE Register #4

  wire [15:0] xgr5;          // XGATE Register #5

  wire [15:0] xgr6;          // XGATE Register #6

  wire [15:0] xgr7;          // XGATE Register #7

  wire [15:0] xgisp74;       // XGATE Interrupt level 7-4 stack pointer

  wire [15:0] xgisp30;       // XGATE Interrupt level 3-0 stack pointer

  wire        write_xgmctl;  // Write Strobe for XGMCTL register

  wire        write_xgchid;  // Write Strobe for XGCHID register

  wire        write_xgisp74; // Write Strobe for XGISP74 register

  wire        write_xgisp30; // Write Strobe for XGISP30 register

  wire        write_xgvbr;   // Write Strobe for XGVBR_LO register

  wire        write_xgif_7;  // Write Strobe for Interrupt Flag Register 7

  wire        write_xgif_6;  // Write Strobe for Interrupt Flag Register 6

  wire        write_xgif_5;  // Write Strobe for Interrupt Flag Register 5

  wire        write_xgif_4;  // Write Strobe for Interrupt Flag Register 4

  wire        write_xgif_3;  // Write Strobe for Interrupt Flag Register 3

  wire        write_xgif_2;  // Write Strobe for Interrupt Flag Register 2

  wire        write_xgif_1;  // Write Strobe for Interrupt Flag Register 1

  wire        write_xgif_0;  // Write Strobe for Interrupt Flag Register 0

  wire        write_xgswt;   // Write Strobe for XGSWT register

  wire        write_xgsem;   // Write Strobe for XGSEM register

  wire        write_xgccr;   // Write Strobe for XGATE Condition Code Register

  wire        write_xgpc;    // Write Strobe for XGATE Program Counter

  wire        write_xgr7;    // Write Strobe for XGATE Data Register R7

  wire        write_xgr6;    // Write Strobe for XGATE Data Register R6

  wire        write_xgr5;    // Write Strobe for XGATE Data Register R5

  wire        write_xgr4;    // Write Strobe for XGATE Data Register R4

  wire        write_xgr3;    // Write Strobe for XGATE Data Register R3

  wire        write_xgr2;    // Write Strobe for XGATE Data Register R2

  wire        write_xgr1;    // Write Strobe for XGATE Data Register R1

  wire        clear_xgif_7;    // Strobe for decode to clear interrupt flag bank 7

  wire        clear_xgif_6;    // Strobe for decode to clear interrupt flag bank 6

  wire        clear_xgif_5;    // Strobe for decode to clear interrupt flag bank 5

  wire        clear_xgif_4;    // Strobe for decode to clear interrupt flag bank 4

  wire        clear_xgif_3;    // Strobe for decode to clear interrupt flag bank 3

  wire        clear_xgif_2;    // Strobe for decode to clear interrupt flag bank 2

  wire        clear_xgif_1;    // Strobe for decode to clear interrupt flag bank 1

  wire        clear_xgif_0;    // Strobe for decode to clear interrupt flag bank 0

  wire [15:0] clear_xgif_data; // Data for decode to clear interrupt flag

  wire        xge;           // XGATE Module Enable

  wire        xgfrz;         // Stop XGATE in Freeze Mode

  wire        xgdbg_set;     // Enter XGATE Debug Mode

  wire        xgdbg_clear;   // Leave XGATE Debug Mode

  wire        xgss;          // XGATE Single Step

  wire        xgsweif_c;     // Clear XGATE Software Error Interrupt FLag

  wire        xgie;          // XGATE Interrupt Enable

  wire [ 6:0] int_req;       // Encoded interrupt request

  wire [ 6:0] xgchid;        // Channel actively being processed

  wire [127:0] xgif_status;   // Status bits of interrupt output flags that have been set

  wire [15:1] xgvbr;         // XGATE vector Base Address Register

  wire        brk_irq_ena;   // Enable BRK instruction to generate interrupt

  wire [15:0] xgate_address;   //

  wire [15:0] write_mem_data;  //

  wire [15:0] read_mem_data;   //

  wire        mem_access;      //

  wire        mem_req_ack;     //

  wire        debug_active;    // RISC state machine in Debug mode 

  wire [ 7:0] host_semap;    // Semaphore status for host

//  wire [15:0] write_mem_data;

//  wire [15:0] read_mem_data;

//  wire [15:0] perif_data;

  assign xgif = xgif_status[MAX_CHANNEL:0];

  // ---------------------------------------------------------------------------

  // Wishbone Slave Bus interface

  xgate_wbs_bus #(.ARST_LVL(ARST_LVL),

                  .SINGLE_CYCLE(SINGLE_CYCLE))

    wishbone_s(

    .wbs_dat_o( wbs_dat_o ),

    .wbs_ack_o( wbs_ack_o ),

    .wbs_clk_i( wbs_clk_i ),

    .wbs_rst_i( wbs_rst_i ),

    .arst_i( arst_i ),

    .wbs_adr_i( wbs_adr_i ),

    .wbs_dat_i( wbs_dat_i ),

    .wbs_we_i( wbs_we_i ),

    .wbs_stb_i( wbs_stb_i ),

    .wbs_cyc_i( wbs_cyc_i ),

    .wbs_sel_i( wbs_sel_i ),

    // outputs

    .sync_reset( sync_reset ),

    .write_xgmctl( write_xgmctl ),

    .write_xgchid( write_xgchid ),

    .write_xgisp74( write_xgisp74 ),

    .write_xgisp30( write_xgisp30 ),

    .write_xgvbr( write_xgvbr ),

    .write_xgif_7( write_xgif_7 ),

    .write_xgif_6( write_xgif_6 ),

    .write_xgif_5( write_xgif_5 ),

    .write_xgif_4( write_xgif_4 ),

    .write_xgif_3( write_xgif_3 ),

    .write_xgif_2( write_xgif_2 ),

    .write_xgif_1( write_xgif_1 ),

    .write_xgif_0( write_xgif_0 ),

    .write_xgswt( write_xgswt ),

    .write_xgsem( write_xgsem ),

    .write_xgccr( write_xgccr ),

    .write_xgpc( write_xgpc ),

    .write_xgr7( write_xgr7 ),

    .write_xgr6( write_xgr6 ),

    .write_xgr5( write_xgr5 ),

    .write_xgr4( write_xgr4 ),

    .write_xgr3( write_xgr3 ),

    .write_xgr2( write_xgr2 ),

    .write_xgr1( write_xgr1 ),

    // inputs    

    .async_rst_b  ( async_rst_b ),

    .read_regs    (               // in  -- read register bits

                   { xgr7,             // XGR7

                     xgr6,             // XGR6

                     xgr5,             // XGR5

                     xgr4,             // XGR4

                     xgr3,             // XGR3

                     xgr2,             // XGR2

                     xgr1,             // XGR1

                     16'b0,            // Reserved (XGR0)

                     xgate_address,    // XGPC

                     {12'h000,  negative_flag, zero_flag, overflow_flag, carry_flag},  // XGCCR

                     16'b0,                // Reserved

                     {8'h00, host_semap},  // XGSEM

                     {8'h00, xgswt},       // XGSWT

                     xgif_status[ 15:  0], // XGIF_0

                     xgif_status[ 31: 16], // XGIF_1

                     xgif_status[ 47: 32], // XGIF_2

                     xgif_status[ 63: 48], // XGIF_3

                     xgif_status[ 79: 64], // XGIF_4

                     xgif_status[ 95: 80], // XGIF_5

                     xgif_status[111: 96], // XGIF_6

                     xgif_status[127:112], // XGIF_7

                     {xgvbr[15:1], 1'b0},  // XGVBR

                     xgisp30,              // Reserved

                     xgisp74,              // Reserved

                     {8'b0, 1'b0, xgchid}, // XGCHID

                     {8'b0, xge, xgfrz, debug_active, 1'b0, 1'b0, brk_irq_ena, xg_sw_irq, xgie}  // XGMCTL

                   }

                  )

  );

  // ---------------------------------------------------------------------------

  xgate_regs #(.ARST_LVL(ARST_LVL),

               .MAX_CHANNEL(MAX_CHANNEL))

    regs(

    // outputs

    .xge( xge ),

    .xgfrz( xgfrz ),

    .xgdbg_set( xgdbg_set ),

    .xgdbg_clear( xgdbg_clear ),

    .xgss( xgss ),

    .xgsweif_c( xgsweif_c ),

    .xgie( xgie ),

    .brk_irq_ena( brk_irq_ena ),

    .xgvbr( xgvbr ),

    .xgswt( xgswt ),

    .xgisp74( xgisp74 ),

    .xgisp30( xgisp30 ),

    .clear_xgif_7( clear_xgif_7 ),

    .clear_xgif_6( clear_xgif_6 ),

    .clear_xgif_5( clear_xgif_5 ),

    .clear_xgif_4( clear_xgif_4 ),

    .clear_xgif_3( clear_xgif_3 ),

    .clear_xgif_2( clear_xgif_2 ),

    .clear_xgif_1( clear_xgif_1 ),

    .clear_xgif_0( clear_xgif_0 ),

    .clear_xgif_data( clear_xgif_data ),

    // inputs

    .async_rst_b( async_rst_b ),

    .sync_reset( sync_reset ),

    .bus_clk( wbs_clk_i ),

    .write_bus( wbs_dat_i ),

    .write_xgmctl( write_xgmctl ),

    .write_xgisp74( write_xgisp74 ),

    .write_xgisp30( write_xgisp30 ),

    .write_xgvbr( write_xgvbr ),

    .write_xgif_7( write_xgif_7 ),

    .write_xgif_6( write_xgif_6 ),

    .write_xgif_5( write_xgif_5 ),

    .write_xgif_4( write_xgif_4 ),

    .write_xgif_3( write_xgif_3 ),

    .write_xgif_2( write_xgif_2 ),

    .write_xgif_1( write_xgif_1 ),

    .write_xgif_0( write_xgif_0 ),

    .write_xgswt( write_xgswt )

  );

  // ---------------------------------------------------------------------------

  xgate_risc #(.MAX_CHANNEL(MAX_CHANNEL))

    risc(

    // outputs

    .xgate_address( xgate_address ),

    .write_mem_strb_l( write_mem_strb_l ),

    .write_mem_strb_h( write_mem_strb_h ),

    .write_mem_data( write_mem_data ),

    .zero_flag( zero_flag ),

    .negative_flag( negative_flag ),

    .carry_flag( carry_flag ),

    .overflow_flag( overflow_flag ),

    .xgchid( xgchid ),

    .host_semap( host_semap ),

    .xgr1( xgr1 ),

    .xgr2( xgr2 ),

    .xgr3( xgr3 ),

    .xgr4( xgr4 ),

    .xgr5( xgr5 ),

    .xgr6( xgr6 ),

    .xgr7( xgr7 ),

    .xgif_status( xgif_status ),

    .debug_active( debug_active ),

    .xg_sw_irq( xg_sw_irq ),

    .mem_access( mem_access ),

    // inputs

    .risc_clk( risc_clk ),

    .perif_data( wbs_dat_i ),

    .async_rst_b( async_rst_b ),

    .read_mem_data( read_mem_data ),

    .mem_req_ack( mem_req_ack ),

    .xge( xge ),

    .xgfrz( xgfrz ),

    .xgdbg_set( xgdbg_set ),

    .xgdbg_clear( xgdbg_clear ),

    .debug_mode_i(debug_mode_i),

    .xgss( xgss ),

    .xgvbr( xgvbr ),

    .int_req( int_req ),

    .xgie( xgie ),

    .brk_irq_ena( brk_irq_ena ),

    .write_xgsem( write_xgsem ),

    .write_xgchid( write_xgchid ),

    .write_xgccr( write_xgccr ),

    .write_xgpc( write_xgpc ),

    .write_xgr7( write_xgr7 ),

    .write_xgr6( write_xgr6 ),

    .write_xgr5( write_xgr5 ),

    .write_xgr4( write_xgr4 ),

    .write_xgr3( write_xgr3 ),

    .write_xgr2( write_xgr2 ),

    .write_xgr1( write_xgr1 ),

    .clear_xgif_7( clear_xgif_7 ),

    .clear_xgif_6( clear_xgif_6 ),

    .clear_xgif_5( clear_xgif_5 ),

    .clear_xgif_4( clear_xgif_4 ),

    .clear_xgif_3( clear_xgif_3 ),

    .clear_xgif_2( clear_xgif_2 ),

    .clear_xgif_1( clear_xgif_1 ),

    .clear_xgif_0( clear_xgif_0 ),

    .xgsweif_c( xgsweif_c ),

    .clear_xgif_data( clear_xgif_data )

  );

  xgate_irq_encode #(.MAX_CHANNEL(MAX_CHANNEL))

    irq_encode(

    // outputs

    .int_req( int_req ),

    // inputs

    .chan_req_i( chan_req_i )

  );

  // ---------------------------------------------------------------------------

  // Wishbone Master Bus interface

  xgate_wbm_bus #(.ARST_LVL(ARST_LVL))

    wishbone_m(

  // Wishbone Master Signals

    .wbm_dat_o( wbm_dat_o ),

    .wbm_we_o( wbm_we_o ),

    .wbm_stb_o( wbm_stb_o ),

    .wbm_cyc_o( wbm_cyc_o ),

    .wbm_sel_o( wbm_sel_o ),

    .wbm_adr_o( wbm_adr_o ),

    .wbm_dat_i( wbm_dat_i ),

    .wbm_ack_i( wbm_ack_i ),

    .wbs_clk_i( wbs_clk_i ),

    .wbs_rst_i( wbs_rst_i ),

    .arst_i( arst_i ),

 // XGATE Control Signals

    .xge( xge ),

    .mem_access( mem_access ),

    .read_mem_data( read_mem_data ),

    .xgate_address( xgate_address ),

    .mem_req_ack( mem_req_ack ),

    .write_mem_strb_l( write_mem_strb_l ),

    .write_mem_strb_h( write_mem_strb_h ),

    .write_mem_data( write_mem_data )

  );

endmodule  // xgate_top