I have logic (entities) in my design that I don't remember using, what is this? Sld_hub: auto_hub

This is an entity that is inserted when using Mega-functions that use JTAG, such as SignalTap II and JTAG Uart, and is a block that connects JTAG and UserLogic.

Altera's knowwledge database also has a description, so please check it as well.
  https://www.altera.com/support/support-resources/knowledge-base/solutions/rd09012005_325.html






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