//------------------------------------------------------------------------------
// The confidential and proprietary information contained in this file may
// only be used by a person authorised under and to the extent permitted
// by a subsisting licensing agreement from ARM Limited.
//
//            (C) COPYRIGHT 2010 ARM Limited.
//                ALL RIGHTS RESERVED
//
// This entire notice must be reproduced on all copies of this file
// and copies of this file may only be made by a person if such person is
// permitted to do so under the terms of a subsisting license agreement
// from ARM Limited.
//
//      SVN Information
//
//      Checked In          : 2010-08-03 19:08:25 +0100 (Tue, 03 Aug 2010)
//
//      Revision            : 144972
//
//      Release Information : AT510-MN-80001-r0p0-00rel0
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
// Cortex-M0 DesignStart processor macro cell level
//------------------------------------------------------------------------------

module CORTEXM0DS (
  // CLOCK AND RESETS ------------------
  input  wire        HCLK,              // Clock
  input  wire        HRESETn,           // Asynchronous reset

  // AHB-LITE MASTER PORT --------------
  output wire [31:0] HADDR,             // AHB transaction address
  output wire [ 2:0] HBURST,            // AHB burst: tied to single
  output wire        HMASTLOCK,         // AHB locked transfer (always zero)
  output wire [ 3:0] HPROT,             // AHB protection: priv; data or inst
  output wire [ 2:0] HSIZE,             // AHB size: byte, half-word or word
  output wire [ 1:0] HTRANS,            // AHB transfer: non-sequential only
  output wire [31:0] HWDATA,            // AHB write-data
  output wire        HWRITE,            // AHB write control
  input  wire [31:0] HRDATA,            // AHB read-data
  input  wire        HREADY,            // AHB stall signal
  input  wire        HRESP,             // AHB error response

  // MISCELLANEOUS ---------------------
  input  wire        NMI,               // Non-maskable interrupt input
  input  wire [15:0] IRQ,               // Interrupt request inputs
  output wire        TXEV,              // Event output (SEV executed)
  input  wire        RXEV,              // Event input
  output wire        LOCKUP,            // Core is locked-up
  output wire        SYSRESETREQ,       // System reset request

  // POWER MANAGEMENT ------------------
  output wire        SLEEPING           // Core and NVIC sleeping
);

//------------------------------------------------------------------------------
// Declare visibility signals and some intermediate signals
//------------------------------------------------------------------------------
wire    [31: 0] cm0_r00;
wire    [31: 0] cm0_r01;
wire    [31: 0] cm0_r02;
wire    [31: 0] cm0_r03;
wire    [31: 0] cm0_r04;
wire    [31: 0] cm0_r05;
wire    [31: 0] cm0_r06;
wire    [31: 0] cm0_r07;
wire    [31: 0] cm0_r08;
wire    [31: 0] cm0_r09;
wire    [31: 0] cm0_r10;
wire    [31: 0] cm0_r11;
wire    [31: 0] cm0_r12;
wire    [31: 0] cm0_msp;
wire    [31: 0] cm0_psp;
wire    [31: 0] cm0_r14;
wire    [31: 0] cm0_pc;
wire    [31: 0] cm0_xpsr;
wire    [31: 0] cm0_control;
wire    [31: 0] cm0_primask;

wire    [29: 0] vis_msp;
wire    [29: 0] vis_psp;
wire    [30: 0] vis_pc;
wire    [ 3: 0] vis_apsr;
wire            vis_tbit;
wire    [ 5: 0] vis_ipsr;
wire            vis_control;
wire            vis_primask;

//------------------------------------------------------------------------------
// Instantiate Cortex-M0 processor logic level
//------------------------------------------------------------------------------

cortexm0ds_logic u_logic (
  .hclk                 (HCLK),
  .hreset_n             (HRESETn),

  .haddr_o              (HADDR[31:0]),
  .hburst_o             (HBURST[2:0]),
  .hmastlock_o          (HMASTLOCK),
  .hprot_o              (HPROT[3:0]),
  .hsize_o              (HSIZE[2:0]),
  .htrans_o             (HTRANS[1:0]),
  .hwdata_o             (HWDATA[31:0]),
  .hwrite_o             (HWRITE),
  .hrdata_i             (HRDATA[31:0]),
  .hready_i             (HREADY),
  .hresp_i              (HRESP),

  .nmi_i                (NMI),
  .irq_i                (IRQ[15:0]),
  .txev_o               (TXEV),
  .rxev_i               (RXEV),
  .lockup_o             (LOCKUP),
  .sys_reset_req_o      (SYSRESETREQ),

  .sleeping_o           (SLEEPING),

  .vis_r0_o             (cm0_r00[31:0]),
  .vis_r1_o             (cm0_r01[31:0]),
  .vis_r2_o             (cm0_r02[31:0]),
  .vis_r3_o             (cm0_r03[31:0]),
  .vis_r4_o             (cm0_r04[31:0]),
  .vis_r5_o             (cm0_r05[31:0]),
  .vis_r6_o             (cm0_r06[31:0]),
  .vis_r7_o             (cm0_r07[31:0]),
  .vis_r8_o             (cm0_r08[31:0]),
  .vis_r9_o             (cm0_r09[31:0]),
  .vis_r10_o            (cm0_r10[31:0]),
  .vis_r11_o            (cm0_r11[31:0]),
  .vis_r12_o            (cm0_r12[31:0]),
  .vis_msp_o            (vis_msp[29:0]),
  .vis_psp_o            (vis_psp[29:0]),
  .vis_r14_o            (cm0_r14[31:0]),
  .vis_pc_o             (vis_pc[30:0]),
  .vis_apsr_o           (vis_apsr[3:0]),
  .vis_tbit_o           (vis_tbit),
  .vis_ipsr_o           (vis_ipsr[5:0]),
  .vis_control_o        (vis_control),
  .vis_primask_o        (vis_primask)
);

//------------------------------------------------------------------------------
// Construct some visibility signals out of intermediate signals
//------------------------------------------------------------------------------

assign cm0_msp     = {vis_msp[29:0],2'd0};
assign cm0_psp     = {vis_psp[29:0],2'd0};
assign cm0_pc      = {vis_pc[30:0],1'b0};
assign cm0_xpsr    = {vis_apsr[3:0],3'd0,vis_tbit,18'd0,vis_ipsr[5:0]};
assign cm0_control = {30'd0,vis_control,1'b0};
assign cm0_primask = {31'd0,vis_primask};

endmodule