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what is the Controller in BT?

HI,ALL,

i find such sentence in core (BLUETOOTH SPECIFICATION Version 4.2 [Vol 1, Part A] page 13)

'A Controller is a logical entity defined as all of the layers below HCI'.

So i wanna know that what the controller is.

and which layer contains the BT chip such as NRF51822 ? ( HCI?? )

Thank you very much!!!!

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