Subversion Repositories openmsp430

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

// Copyright (C) 2015 Authors

//

// 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, write to the Free Software Foundation,

// Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

//

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

//

// *File Name: ogfx_gpu_reg.v

//

// *Module Description:

//                      Configuration registers of the Graphic-Processing unit

//

// *Author(s):

//              - Olivier Girard,    olgirard@gmail.com

//

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

// $Rev$

// $LastChangedBy$

// $LastChangedDate$

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

`ifdef OGFX_NO_INCLUDE

`else

`include "openGFX430_defines.v"

`endif

module  ogfx_gpu_reg (

// OUTPUTs

    cfg_dst_px_addr_o,                            // Destination pixel address configuration

    cfg_dst_cl_swp_o,                             // Destination Column/Line-Swap configuration

    cfg_dst_x_swp_o,                              // Destination X-Swap configuration

    cfg_dst_y_swp_o,                              // Destination Y-Swap configuration

    cfg_fill_color_o,                             // Fill color (for rectangle fill operation)

    cfg_pix_op_sel_o,                             // Pixel operation to be performed during the copy

    cfg_rec_width_o,                              // Rectangle width configuration

    cfg_rec_height_o,                             // Rectangle height configuration

    cfg_src_px_addr_o,                            // Source pixel address configuration

    cfg_src_cl_swp_o,                             // Source Column/Line-Swap configuration

    cfg_src_x_swp_o,                              // Source X-Swap configuration

    cfg_src_y_swp_o,                              // Source Y-Swap configuration

    cfg_transparent_color_o,                      // Transparent color (for rectangle transparent copy operation)

    gpu_cmd_done_evt_o,                           // GPU command done event

    gpu_cmd_error_evt_o,                          // GPU command error event

    gpu_get_data_o,                               // GPU get next data

    exec_fill_o,                                  // Rectangle fill on going

    exec_copy_o,                                  // Rectangle copy on going

    exec_copy_trans_o,                            // Rectangle transparent copy on going

    trig_exec_o,                                  // Trigger rectangle execution

// INPUTs

    mclk,                                         // Main system clock

    puc_rst,                                      // Main system reset

    gpu_data_i,                                   // GPU data

    gpu_data_avail_i,                             // GPU data available

    gfx_mode_i,                                   // Video mode (1xx:16bpp / 011:8bpp / 010:4bpp / 001:2bpp / 000:1bpp)

    gpu_enable_i,                                 // GPU enable

    gpu_exec_done_i                               // GPU execution done

);

// OUTPUTs

//=========

output [`APIX_MSB:0] cfg_dst_px_addr_o;           // Destination pixel address configuration

output               cfg_dst_cl_swp_o;            // Destination Column/Line-Swap configuration

output               cfg_dst_x_swp_o;             // Destination X-Swap configuration

output               cfg_dst_y_swp_o;             // Destination Y-Swap configuration

output        [15:0] cfg_fill_color_o;            // Fill color (for rectangle fill operation)

output         [3:0] cfg_pix_op_sel_o;            // Pixel operation to be performed during the copy

output [`LPIX_MSB:0] cfg_rec_width_o;             // Rectangle width configuration

output [`LPIX_MSB:0] cfg_rec_height_o;            // Rectangle height configuration

output [`APIX_MSB:0] cfg_src_px_addr_o;           // Source pixel address configuration

output               cfg_src_cl_swp_o;            // Source Column/Line-Swap configuration

output               cfg_src_x_swp_o;             // Source X-Swap configuration

output               cfg_src_y_swp_o;             // Source Y-Swap configuration

output        [15:0] cfg_transparent_color_o;     // Transparent color (for rectangle transparent copy operation)

output               gpu_cmd_done_evt_o;          // GPU command done event

output               gpu_cmd_error_evt_o;         // GPU command error event

output               gpu_get_data_o;              // GPU get next data

output               exec_fill_o;                 // Rectangle fill on going

output               exec_copy_o;                 // Rectangle copy on going

output               exec_copy_trans_o;           // Rectangle transparent copy on going

output               trig_exec_o;                 // Trigger rectangle execution

// INPUTs

//=========

input                mclk;                        // Main system clock

input                puc_rst;                     // Main system reset

input         [15:0] gpu_data_i;                  // GPU data

input                gpu_data_avail_i;            // GPU data available

input          [2:0] gfx_mode_i;                  // Video mode (1xx:16bpp / 011:8bpp / 010:4bpp / 001:2bpp / 000:1bpp)

input                gpu_enable_i;                // GPU enable

input                gpu_exec_done_i;             // GPU execution done

//=============================================================================

// 1)  WIRE, REGISTERS AND PARAMETER DECLARATION

//=============================================================================

// Video modes decoding

wire                 gfx_mode_1_bpp    =  (gfx_mode_i == 3'b000);

wire                 gfx_mode_2_bpp    =  (gfx_mode_i == 3'b001);

wire                 gfx_mode_4_bpp    =  (gfx_mode_i == 3'b010);

wire                 gfx_mode_8_bpp    =  (gfx_mode_i == 3'b011);

wire                 gfx_mode_16_bpp   = ~(gfx_mode_8_bpp | gfx_mode_4_bpp | gfx_mode_2_bpp | gfx_mode_1_bpp);

// Remaining wires/registers

reg                  exec_fill_o;

reg                  exec_copy_o;

reg                  exec_copy_trans_o;

reg            [1:0] src_offset_sel;

reg                  src_x_swp;

reg                  src_y_swp;

reg                  src_cl_swp;

reg            [3:0] pix_op_sel;

reg            [1:0] dst_offset_sel;

reg                  dst_x_swp;

reg                  dst_y_swp;

reg                  dst_cl_swp;

reg            [3:0] reg_access;

wire           [3:0] reg_access_nxt;

reg           [15:0] fill_color;

reg    [`LPIX_MSB:0] rec_width;

reg    [`LPIX_MSB:0] rec_height;

wire   [`APIX_MSB:0] src_px_addr;

wire   [`APIX_MSB:0] src_px_addr_align;

wire   [`APIX_MSB:0] dst_px_addr;

wire   [`APIX_MSB:0] dst_px_addr_align;

wire   [`APIX_MSB:0] of0_addr;

wire   [`APIX_MSB:0] of1_addr;

wire   [`APIX_MSB:0] of2_addr;

wire   [`APIX_MSB:0] of3_addr;

reg           [15:0] transparent_color;

wire   [`APIX_MSB:0] src_offset_addr;

wire   [`APIX_MSB:0] dst_offset_addr;

//=============================================================================

// 2)  GPU COMMAND STATE MACHINE

//=============================================================================

//

// EXEC_FILL        - Execute rectangle fill command

//                    {2'b00, reserved<4:0>,                                     pxop[3:0], dst_offset[1:0], dst_X-Swp, dst_Y-Swp, dst_CL-Swp}

//                    {fill_color[15:0]}

//

// EXEC_COPY        - Execute rectangle copy command

//                    {2'b01, src_offset[1:0], src_X-Swp, src_Y-Swp, src_CL-Swp, pxop[3:0], dst_offset[1:0], dst_X-Swp, dst_Y-Swp, dst_CL-Swp}

//

// EXEC_COPY_TRANS  - Execute rectangle copy with transparency command

//                    {2'b10, src_offset[1:0], src_X-Swp, src_Y-Swp, src_CL-Swp, pxop[3:0], dst_offset[1:0], dst_X-Swp, dst_Y-Swp, dst_CL-Swp}

//

// REC_WIDTH        - Set rectangle width

//                    {4'b1100, width[11:0]}

//

// REC_HEIGHT       - Set rectangle height

//                    {4'b1101, height[11:0]}

//

// SRC_PX_ADDR      - Set source address

//                    {4'b1111, 2'b10, 10'b0000000000}

//                    {addr[15:0]                    }

//                    {addr[31:16]                   }

//

// DST_PX_ADDR      - Set destination address

//                    {4'b1111, 2'b10, 10'b0000000001}

//                    {addr[15:0]                    }

//                    {addr[31:16]                   }

//

// OF0_ADDR         - Set address offset 0

//                    {4'b1111, 2'b10, 10'b0000010000}

//                    {addr[15:0]                    }

//                    {addr[31:16]                   }

//

// OF1_ADDR         - Set address offset 1

//                    {4'b1111, 2'b10, 10'b0000010001}

//                    {addr[15:0]                    }

//                    {addr[31:16]                   }

//

// OF2_ADDR         - Set address offset 2

//                    {4'b1111, 2'b10, 10'b0000010010}

//                    {addr[15:0]                    }

//                    {addr[31:16]                   }

//

// OF3_ADDR         - Set address offset 3

//                    {4'b1111, 2'b10, 10'b0000010011}

//                    {addr[15:0]                    }

//                    {addr[31:16]                   }

//

// SET_FILL         - Set fill color

//                    {4'b1111, 2'b01, 10'b0000100000}

//                    {fill_color[15:0]              }

//

// SET_TRANSPARENT  - Set transparent color

//                    {4'b1111, 2'b01, 10'b0000100001}

//                    {transparent_color[15:0]       }

//

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

// State definition

parameter  CMD_WAIT         =  4'h0;

parameter  CMD_READ         =  4'h1;

parameter  DATA1B_WAIT      =  4'h2;

parameter  DATA1B_READ      =  4'h3;

parameter  DATA2B1_WAIT     =  4'h4;

parameter  DATA2B1_READ     =  4'h5;

parameter  DATA2B2_WAIT     =  4'h6;

parameter  DATA2B2_READ     =  4'h7;

parameter  EXEC_START       =  4'h8;

parameter  EXEC             =  4'h9;

parameter  ERROR            =  4'hA;

// State machine

reg  [3:0] gpu_state;

reg  [3:0] gpu_state_nxt;

// Arcs control

wire       cmd_available    =  gpu_data_avail_i;

wire       cmd_not_valid    = ((gpu_data_i[15:14]!= `OP_EXEC_FILL      ) &

                               (gpu_data_i[15:14]!= `OP_EXEC_COPY      ) &

                               (gpu_data_i[15:14]!= `OP_EXEC_COPY_TRANS) &

                               (gpu_data_i[15:12]!= `OP_REC_WIDTH      ) &

                               (gpu_data_i[15:12]!= `OP_REC_HEIGHT     ) &

                               (gpu_data_i[15:0] != `OP_SRC_PX_ADDR    ) &

                               (gpu_data_i[15:0] != `OP_DST_PX_ADDR    ) &

                               (gpu_data_i[15:0] != `OP_OF0_ADDR       ) &

                               (gpu_data_i[15:0] != `OP_OF1_ADDR       ) &

                               (gpu_data_i[15:0] != `OP_OF2_ADDR       ) &

                               (gpu_data_i[15:0] != `OP_OF3_ADDR       ) &

                               (gpu_data_i[15:0] != `OP_SET_FILL       ) &

                               (gpu_data_i[15:0] != `OP_SET_TRANSPARENT));

wire       cmd_has_1b_data  =  (gpu_data_i[15:14]== `OP_EXEC_FILL      ) |

                               (gpu_data_i[15:0] == `OP_SET_FILL       ) |

                               (gpu_data_i[15:0] == `OP_SET_TRANSPARENT);

wire       cmd_has_2b_data  =  (gpu_data_i[15:0] == `OP_SRC_PX_ADDR    ) |

                               (gpu_data_i[15:0] == `OP_DST_PX_ADDR    ) |

                               (gpu_data_i[15:0] == `OP_OF0_ADDR       ) |

                               (gpu_data_i[15:0] == `OP_OF1_ADDR       ) |

                               (gpu_data_i[15:0] == `OP_OF2_ADDR       ) |

                               (gpu_data_i[15:0] == `OP_OF3_ADDR       );

wire       cmd_has_exec     =  exec_fill_o | exec_copy_o | exec_copy_trans_o;

wire       data_available   =  gpu_data_avail_i;

// State transition

always @(gpu_state or cmd_available or cmd_not_valid or cmd_has_1b_data or cmd_has_2b_data or cmd_has_exec or data_available or gpu_exec_done_i)

  case (gpu_state)

    CMD_WAIT     : gpu_state_nxt =  cmd_available   ? CMD_READ     : CMD_WAIT     ;

    CMD_READ     : gpu_state_nxt =  cmd_not_valid   ? ERROR        :

                                    cmd_has_1b_data ? DATA1B_WAIT  :

                                    cmd_has_2b_data ? DATA2B1_WAIT :

                                    cmd_has_exec    ? EXEC_START   : CMD_WAIT     ;

    DATA1B_WAIT  : gpu_state_nxt =  data_available  ? DATA1B_READ  : DATA1B_WAIT  ;

    DATA1B_READ  : gpu_state_nxt =  cmd_has_exec    ? EXEC_START   : CMD_WAIT     ;

    DATA2B1_WAIT : gpu_state_nxt =  data_available  ? DATA2B1_READ : DATA2B1_WAIT ;

    DATA2B1_READ : gpu_state_nxt =                    DATA2B2_WAIT                ;

    DATA2B2_WAIT : gpu_state_nxt =  data_available  ? DATA2B2_READ : DATA2B2_WAIT ;

    DATA2B2_READ : gpu_state_nxt =  cmd_has_exec    ? EXEC_START   : CMD_WAIT     ;

    EXEC_START   : gpu_state_nxt =  gpu_exec_done_i ? CMD_WAIT     : EXEC         ;

    EXEC         : gpu_state_nxt =  gpu_exec_done_i ? CMD_WAIT     : EXEC         ;

    ERROR        : gpu_state_nxt =                    ERROR                       ;

  // pragma coverage off

    default      : gpu_state_nxt =                    CMD_WAIT                    ;

  // pragma coverage on

  endcase

// State machine

always @(posedge mclk or posedge puc_rst)

  if (puc_rst)            gpu_state <= CMD_WAIT;

  else if (~gpu_enable_i) gpu_state <= CMD_WAIT;

  else                    gpu_state <= gpu_state_nxt;

// Event generation, fifo data request

assign  gpu_cmd_done_evt_o  = (gpu_state!=ERROR) & (gpu_state!=CMD_WAIT) & (gpu_state_nxt==CMD_WAIT);

assign  gpu_cmd_error_evt_o = (gpu_state==ERROR);

assign  gpu_get_data_o      = (gpu_state==CMD_READ) | (gpu_state==DATA1B_READ) | (gpu_state==DATA2B1_READ) | (gpu_state==DATA2B2_READ);

// Execution triggers

assign  trig_exec_o         = (exec_fill_o      |

                               exec_copy_o      |

                               exec_copy_trans_o) & (gpu_state==EXEC_START);

//=============================================================================

// 3)  CONFIGURATION REGISTERS

//=============================================================================

// Detect execution commands

always @(posedge mclk or posedge puc_rst)

  if (puc_rst)                                    exec_fill_o       <= 1'b0;

  else if ((gpu_state==CMD_WAIT) & cmd_available) exec_fill_o       <= (gpu_data_i[15:14]==`OP_EXEC_FILL);

  else if ((gpu_state_nxt==CMD_WAIT)            ) exec_fill_o       <= 1'b0;

always @(posedge mclk or posedge puc_rst)

  if (puc_rst)                                    exec_copy_o       <= 1'b0;

  else if ((gpu_state==CMD_WAIT) & cmd_available) exec_copy_o       <= (gpu_data_i[15:14]==`OP_EXEC_COPY);

  else if ((gpu_state_nxt==CMD_WAIT)            ) exec_copy_o       <= 1'b0;

always @(posedge mclk or posedge puc_rst)

  if (puc_rst)                                    exec_copy_trans_o <= 1'b0;

  else if ((gpu_state==CMD_WAIT) & cmd_available) exec_copy_trans_o <= (gpu_data_i[15:14]==`OP_EXEC_COPY_TRANS);

  else if ((gpu_state_nxt==CMD_WAIT)            ) exec_copy_trans_o <= 1'b0;

// Detect register accesses

parameter REG_EXEC_FILL       = 4'h1;

parameter REG_REC_WIDTH       = 4'h2;

parameter REG_REC_HEIGHT      = 4'h3;

parameter REG_SRC_PX_ADDR     = 4'h4;

parameter REG_DST_PX_ADDR     = 4'h5;

parameter REG_OF0_ADDR        = 4'h6;

parameter REG_OF1_ADDR        = 4'h7;

parameter REG_OF2_ADDR        = 4'h8;

parameter REG_OF3_ADDR        = 4'h9;

parameter REG_SET_FILL        = 4'hA;

parameter REG_SET_TRANSPARENT = 4'hB;

assign    reg_access_nxt      = ({4{gpu_data_i[15:14]== `OP_EXEC_FILL      }} & REG_EXEC_FILL      ) |

                                ({4{gpu_data_i[15:12]== `OP_REC_WIDTH      }} & REG_REC_WIDTH      ) |

                                ({4{gpu_data_i[15:12]== `OP_REC_HEIGHT     }} & REG_REC_HEIGHT     ) |

                                ({4{gpu_data_i[15:0] == `OP_SRC_PX_ADDR    }} & REG_SRC_PX_ADDR    ) |

                                ({4{gpu_data_i[15:0] == `OP_DST_PX_ADDR    }} & REG_DST_PX_ADDR    ) |

                                ({4{gpu_data_i[15:0] == `OP_OF0_ADDR       }} & REG_OF0_ADDR       ) |

                                ({4{gpu_data_i[15:0] == `OP_OF1_ADDR       }} & REG_OF1_ADDR       ) |

                                ({4{gpu_data_i[15:0] == `OP_OF2_ADDR       }} & REG_OF2_ADDR       ) |

                                ({4{gpu_data_i[15:0] == `OP_OF3_ADDR       }} & REG_OF3_ADDR       ) |

                                ({4{gpu_data_i[15:0] == `OP_SET_FILL       }} & REG_SET_FILL       ) |

                                ({4{gpu_data_i[15:0] == `OP_SET_TRANSPARENT}} & REG_SET_TRANSPARENT) ;

always @(posedge mclk or posedge puc_rst)

  if (puc_rst)                      reg_access <= 4'h0;

  else if (gpu_state==CMD_READ)     reg_access <= reg_access_nxt;

  else if (gpu_state_nxt==CMD_WAIT) reg_access <= 4'h0;

//=============================================================================

// 4)  CONFIGURATION REGISTERS

//=============================================================================

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

// EXECUTION CONFIG Register

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

wire  exec_all_cfg_wr = (exec_fill_o | exec_copy_o | exec_copy_trans_o) & (gpu_state==CMD_READ);

wire  exec_src_cfg_wr = (              exec_copy_o | exec_copy_trans_o) & (gpu_state==CMD_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)

    begin

       src_offset_sel <= 2'b00;

       src_x_swp      <= 1'b0;

       src_y_swp      <= 1'b0;

       src_cl_swp     <= 1'b0;

    end

  else if (exec_src_cfg_wr)

    begin

       src_offset_sel <= gpu_data_i[13:12];

       src_x_swp      <= gpu_data_i[11];

       src_y_swp      <= gpu_data_i[10];

       src_cl_swp     <= gpu_data_i[9];

    end

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)

    begin

       pix_op_sel     <= 4'b0000;

       dst_offset_sel <= 2'b00;

       dst_x_swp      <= 1'b0;

       dst_y_swp      <= 1'b0;

       dst_cl_swp     <= 1'b0;

    end

  else if (exec_all_cfg_wr)

    begin

       pix_op_sel     <= gpu_data_i[8:5];

       dst_offset_sel <= gpu_data_i[4:3];

       dst_x_swp      <= gpu_data_i[2];

       dst_y_swp      <= gpu_data_i[1];

       dst_cl_swp     <= gpu_data_i[0];

    end

assign cfg_src_x_swp_o  = src_x_swp;

assign cfg_src_y_swp_o  = src_y_swp;

assign cfg_src_cl_swp_o = src_cl_swp;

assign cfg_pix_op_sel_o = pix_op_sel;

assign cfg_dst_x_swp_o  = dst_x_swp;

assign cfg_dst_y_swp_o  = dst_y_swp;

assign cfg_dst_cl_swp_o = dst_cl_swp;

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

// FILL_COLOR Register

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

wire  fill_color_wr = ((reg_access==REG_EXEC_FILL) |

                       (reg_access==REG_SET_FILL ) ) & (gpu_state==DATA1B_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)            fill_color <=  16'h0000;

  else if (fill_color_wr) fill_color <=  gpu_data_i;

assign cfg_fill_color_o = fill_color;

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

// REC_WIDTH Register

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

wire               rec_width_wr = (reg_access_nxt==REG_REC_WIDTH) & (gpu_state==CMD_READ);

wire [`LPIX_MSB:0] rec_w_h_nxt  = (|gpu_data_i[`LPIX_MSB:0]) ? gpu_data_i[`LPIX_MSB:0] :

                                                               {{`LPIX_MSB{1'b0}}, 1'b1};

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)           rec_width <=  {{`LPIX_MSB{1'b0}}, 1'b1};

  else if (rec_width_wr) rec_width <=  rec_w_h_nxt;

assign cfg_rec_width_o = rec_width;

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

// REC_HEIGHT Register

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

wire  rec_height_wr = (reg_access_nxt==REG_REC_HEIGHT) & (gpu_state==CMD_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)            rec_height <=  {{`LPIX_MSB{1'b0}}, 1'b1};

  else if (rec_height_wr) rec_height <=  rec_w_h_nxt;

assign cfg_rec_height_o = rec_height;

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

// SRC_PX_ADDR_HI Register

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

`ifdef VRAM_BIGGER_4_KW

reg [`APIX_HI_MSB:0] src_px_addr_hi;

wire                 src_px_addr_hi_wr = (reg_access==REG_SRC_PX_ADDR) & (gpu_state==DATA2B2_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)                src_px_addr_hi <=  {`APIX_HI_MSB+1{1'b0}};

  else if (src_px_addr_hi_wr) src_px_addr_hi <=  gpu_data_i[`APIX_HI_MSB:0];

`endif

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

// SRC_PX_ADDR_LO Register

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

reg [`APIX_LO_MSB:0] src_px_addr_lo;

wire                 src_px_addr_lo_wr = (reg_access==REG_SRC_PX_ADDR) & (gpu_state==DATA2B1_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)                src_px_addr_lo <=  {`APIX_LO_MSB+1{1'b0}};

  else if (src_px_addr_lo_wr) src_px_addr_lo <=  gpu_data_i[`APIX_LO_MSB:0];

`ifdef VRAM_BIGGER_4_KW

assign      src_px_addr  = {src_px_addr_hi[`APIX_HI_MSB:0], src_px_addr_lo};

`else

assign      src_px_addr  = {src_px_addr_lo[`APIX_LO_MSB:0]};

`endif

assign src_px_addr_align = src_px_addr + src_offset_addr;

assign cfg_src_px_addr_o = {`APIX_MSB+1{gfx_mode_1_bpp }} & {src_px_addr_align[`APIX_MSB:0]           } |

                           {`APIX_MSB+1{gfx_mode_2_bpp }} & {src_px_addr_align[`APIX_MSB-1:0], 1'b0   } |

                           {`APIX_MSB+1{gfx_mode_4_bpp }} & {src_px_addr_align[`APIX_MSB-2:0], 2'b00  } |

                           {`APIX_MSB+1{gfx_mode_8_bpp }} & {src_px_addr_align[`APIX_MSB-3:0], 3'b000 } |

                           {`APIX_MSB+1{gfx_mode_16_bpp}} & {src_px_addr_align[`APIX_MSB-4:0], 4'b0000} ;

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

// DST_PX_ADDR_HI Register

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

`ifdef VRAM_BIGGER_4_KW

reg [`APIX_HI_MSB:0] dst_px_addr_hi;

wire                 dst_px_addr_hi_wr = (reg_access==REG_DST_PX_ADDR) & (gpu_state==DATA2B2_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)                dst_px_addr_hi <=  {`APIX_HI_MSB+1{1'b0}};

  else if (dst_px_addr_hi_wr) dst_px_addr_hi <=  gpu_data_i[`APIX_HI_MSB:0];

`endif

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

// DST_PX_ADDR_LO Register

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

reg [`APIX_LO_MSB:0] dst_px_addr_lo;

wire                 dst_px_addr_lo_wr = (reg_access==REG_DST_PX_ADDR) & (gpu_state==DATA2B1_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)                dst_px_addr_lo <=  {`APIX_LO_MSB+1{1'b0}};

  else if (dst_px_addr_lo_wr) dst_px_addr_lo <=  gpu_data_i[`APIX_LO_MSB:0];

`ifdef VRAM_BIGGER_4_KW

assign      dst_px_addr  = {dst_px_addr_hi[`APIX_HI_MSB:0], dst_px_addr_lo};

`else

assign      dst_px_addr  = {dst_px_addr_lo[`APIX_LO_MSB:0]};

`endif

assign dst_px_addr_align = dst_px_addr + dst_offset_addr;

assign cfg_dst_px_addr_o = {`APIX_MSB+1{gfx_mode_1_bpp }} & {dst_px_addr_align[`APIX_MSB:0]           } |

                           {`APIX_MSB+1{gfx_mode_2_bpp }} & {dst_px_addr_align[`APIX_MSB-1:0], 1'b0   } |

                           {`APIX_MSB+1{gfx_mode_4_bpp }} & {dst_px_addr_align[`APIX_MSB-2:0], 2'b00  } |

                           {`APIX_MSB+1{gfx_mode_8_bpp }} & {dst_px_addr_align[`APIX_MSB-3:0], 3'b000 } |

                           {`APIX_MSB+1{gfx_mode_16_bpp}} & {dst_px_addr_align[`APIX_MSB-4:0], 4'b0000} ;

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

// OF0_ADDR_HI Register

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

`ifdef VRAM_BIGGER_4_KW

reg [`APIX_HI_MSB:0] of0_addr_hi;

wire                 of0_addr_hi_wr = (reg_access==REG_OF0_ADDR) & (gpu_state==DATA2B2_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)             of0_addr_hi <=  {`APIX_HI_MSB+1{1'b0}};

  else if (of0_addr_hi_wr) of0_addr_hi <=  gpu_data_i[`APIX_HI_MSB:0];

`endif

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

// OF0_ADDR_LO Register

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

reg [`APIX_LO_MSB:0] of0_addr_lo;

wire                 of0_addr_lo_wr = (reg_access==REG_OF0_ADDR) & (gpu_state==DATA2B1_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)             of0_addr_lo <=  {`APIX_LO_MSB+1{1'b0}};

  else if (of0_addr_lo_wr) of0_addr_lo <=  gpu_data_i[`APIX_LO_MSB:0];

`ifdef VRAM_BIGGER_4_KW

assign      of0_addr  = {of0_addr_hi[`APIX_HI_MSB:0], of0_addr_lo};

`else

assign      of0_addr  = {of0_addr_lo[`APIX_LO_MSB:0]};

`endif

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

// OF1_ADDR_HI Register

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

`ifdef VRAM_BIGGER_4_KW

reg [`APIX_HI_MSB:0] of1_addr_hi;

wire                 of1_addr_hi_wr = (reg_access==REG_OF1_ADDR) & (gpu_state==DATA2B2_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)             of1_addr_hi <=  {`APIX_HI_MSB+1{1'b0}};

  else if (of1_addr_hi_wr) of1_addr_hi <=  gpu_data_i[`APIX_HI_MSB:0];

`endif

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

// OF1_ADDR_LO Register

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

reg [`APIX_LO_MSB:0] of1_addr_lo;

wire                 of1_addr_lo_wr = (reg_access==REG_OF1_ADDR) & (gpu_state==DATA2B1_READ);

always @ (posedge mclk or posedge puc_rst)

  if (puc_rst)             of1_addr_lo <=  {`APIX_LO_MSB+1{1'b0}};

  else if (of1_addr_lo_wr) of1_addr_lo <=  gpu_data_i[`APIX_LO_MSB:0];

`ifdef VRAM_BIGGER_4_KW

assign      of1_addr  = {of1_addr_hi[`APIX_HI_MSB:0], of1_addr_lo};

`else

assign      of1_addr  = {of1_addr_lo[`APIX_LO_MSB:0]};

`endif

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

// OF2_ADDR_HI Register

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

`ifdef VRAM_BIGGER_4_KW

reg [`APIX_HI_MSB:0] of2_addr_hi;

wire                 of2_addr_hi_wr = (reg_access==REG_OF2_ADDR) & (gpu_state==DATA2B2_READ);