Shenzhen I/O should have a realism option. When it's set to high, you need to search all over the web and pay over 200 CNY download fees in paid forums before you get the leaked datasheet you need. If you are unlucky, you have to reverse engineer the chip specification from schematics of an existing design, or if you are especially unlucky, you need to hunt all over Taobao for commercial products that internally use the chip you need for reverse engineering. #electronics