/*
   COOLGIRL Multicart branch 5.x
*/

module CoolGirl # (
   `include "../CoolGirl_config.vh"
)
(
   input m2,
   input romsel,
   input cpu_rw_in,
   input [14:0] cpu_addr_in,
   inout [7:0] cpu_data_in,
   output [26:13] cpu_addr_out,
   output [14:13] sram_addr_out,
   output cpu_shifers_oe,
   output cpu_dir,
   output flash_we,
   output flash_oe,
   output flash_ce,
   output sram_ce,
   output sram_we,
   output sram_oe,

   input ppu_rd_in,
   input ppu_wr_in,
   input [13:3] ppu_addr_in,
   output [18:10] ppu_addr_out,
   output ppu_rd_out,
   output ppu_wr_out,
   output ppu_ciram_a10,
   inout ppu_not_a13,
   output ppu_ciram_ce,

   output irq
);
   reg [3:0] new_dendy_init = 4'b1111;
   reg [1:0] new_dendy_init_a13l = 2'b11;
   reg [1:0] new_dendy_init_a13h = 2'b11;
   wire new_dendy_init_finished = new_dendy_init == 0;
   reg new_dendy = 0;
   assign cpu_shifers_oe = 1'b0;

   assign cpu_addr_out[26:13] = {prg_base[26:14] | (prg_addr_mapped[20:14] & ~prg_mask[20:14]), prg_addr_mapped[13]};
   assign sram_addr_out[14:13] = sram_page[1:0];
   assign ppu_addr_out[18:10] = ext_ntram_access
      ? {7'b1111111, ppu_addr_in[11:10]}
      : {~(chr_addr_mapped[18] & ~chr_mask[18]), chr_addr_mapped[17:13] & ~chr_mask[17:13], chr_addr_mapped[12:10]};

   assign cpu_data_in = cpu_data_out_enabled ? cpu_data_out : 8'bZZZZZZZZ;
   wire flash_ce_w = ~(~romsel | (m2 & map_rom_on_6000 & cpu_addr_in[14] & cpu_addr_in[13]));
   assign flash_ce = flash_ce_w | cpu_data_out_enabled;
   assign flash_oe = ~cpu_rw_in | flash_ce_w;
   assign flash_we = cpu_rw_in | flash_ce_w | ~prg_write_enabled;
   wire sram_ce_w = ~(cpu_addr_in[14] & cpu_addr_in[13] & m2 & romsel & sram_enabled & ~map_rom_on_6000);
   assign sram_ce = sram_ce_w | cpu_data_out_enabled;
   assign sram_we = cpu_rw_in | sram_ce_w;
   assign sram_oe = ~cpu_rw_in | sram_ce_w;
   assign cpu_dir = (~cpu_rw_in | flash_ce_w) & (~cpu_rw_in | sram_ce_w) & ~cpu_data_out_enabled;
   assign ppu_rd_out = ppu_rd_in | (ppu_addr_in[13] & ~ext_ntram_access);
   assign ppu_wr_out = ppu_wr_in | ((ppu_addr_in[13] | ~chr_write_enabled) & ~ext_ntram_access);
   wire ext_ntram_access = ENABLE_FOUR_SCREEN && four_screen && ppu_addr_in[13] && ~ppu_addr_in[12]; // four-screen and $2000-$2FFF accessed
   assign ppu_ciram_ce = new_dendy_init_finished ?
         (new_dendy ? 1'bZ : // not used by new famiclones
         ext_ntram_access ? 1'b1 : // disable internal NTRAM
         ~ppu_addr_in[13] /*1'bZ*/) // enable it otherwise
         : 1'b0; // ground it while powering on for new famiclones
   assign ppu_not_a13 = new_dendy_init_finished ? 1'bZ : 1'b0;  // ground it while powering on for new famiclones

   always @ (posedge m2)
   begin
      if (!new_dendy_init_finished)
         new_dendy_init <= new_dendy_init - 1'b1;
   end

   always @ (negedge ppu_rd_in)
   begin
      if (new_dendy_init_finished)
      begin
         if ((new_dendy_init_a13l != 0) &&
            (new_dendy_init_a13h != 0) &&
            (ppu_addr_in[13] != ~ppu_not_a13))
               new_dendy <= 1;
         if (~ppu_addr_in[13] && new_dendy_init_a13l != 0)
            new_dendy_init_a13l <= new_dendy_init_a13l - 1'b1;
         if (ppu_addr_in[13] && new_dendy_init_a13h != 0)
            new_dendy_init_a13h <= new_dendy_init_a13h - 1'b1;
      end
   end

`include "../CoolGirl_mappers.vh"

endmodule