MMC5: Fixed extended attributes bug (broken by 80dd9ca8 in 0.2.1)

Core/MMC5.h

@@ -358,6 +358,8 @@ protected:
 			//"Each byte of Expansion RAM is used to enhance the tile at the corresponding address in every nametable"
 
 			//When fetching NT data, we set a flag and then alter the VRAM values read by the PPU on the following 3 cycles (palette, tile low/high byte)
+			uint32_t cycle = PPU::GetCurrentCycle();
+			if(cycle < 257 || cycle > 320) {
 				if(addr >= 0x2000 && (addr & 0x3FF) < 0x3C0) {
 					//Nametable fetches
 					_exAttributeLastNametableFetch = addr & 0x03FF;
@@ -388,6 +390,7 @@ protected:
 					}
 				}
 			}
+		}
 		return BaseMapper::ReadVRAM(addr);
 	}