1 files changed, 56 insertions, 0 deletions
diff --git a/2 (UxROM)/UxROM.v b/2 (UxROM)/UxROM.v
new file mode 100644
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--- /dev/null
+++ b/2 (UxROM)/UxROM.v
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+// UxROM 
+module UxROM # (parameter MIRRORING_VERTICAL = 0)
+	(
+	output led,
+		
+	input	m2,
+	input romsel,
+	input cpu_rw_in,
+	output [18:12] cpu_addr_out,
+	input [14:0] cpu_addr_in,
+	input [7:0] cpu_data_in,
+	output cpu_wr_out,
+	output cpu_rd_out,
+	output cpu_flash_ce,
+	output cpu_sram_ce,
+		
+	input ppu_rd_in,
+	input ppu_wr_in,
+	input [13:10] ppu_addr_in,
+	output [18:10] ppu_addr_out,
+	output ppu_rd_out,
+	output ppu_wr_out,
+	output ppu_flash_ce,
+	output ppu_sram_ce,
+	output ppu_ciram_a10,
+	output ppu_ciram_ce,
+		
+	output irq
+);
+	reg [3:0] cpu_bank;
+
+	assign led = cpu_rw_in && ppu_wr_in;
+
+	assign cpu_addr_out[18:14] = cpu_addr_in[14] ? {5'b11111} : {1'b0, cpu_bank};
+	assign cpu_addr_out[13:12] = cpu_addr_in[13:12];
+	assign cpu_wr_out = 1;
+	assign cpu_rd_out = ~cpu_rw_in;
+	assign cpu_flash_ce = romsel;
+	assign cpu_sram_ce = 1;
+	
+	//assign ppu_addr_out[18:10] = ppu_addr_in[13:10];
+	assign ppu_rd_out = ppu_rd_in;
+	assign ppu_wr_out = ppu_wr_in;
+	assign ppu_sram_ce = ppu_addr_in[13];
+	assign ppu_flash_ce = 1;
+	assign ppu_ciram_a10 = MIRRORING_VERTICAL ? ppu_addr_in[10] : ppu_addr_in[11];
+	assign ppu_ciram_ce = ~ppu_addr_in[13];
+	
+	assign irq = 1'bz;
+	
+	always @ (posedge romsel)
+	begin
+		if (cpu_rw_in == 0)
+			cpu_bank <= cpu_data_in[3:0];
+	end
+endmodule