NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
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Revision V1.30
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Data Buffer
The Data Buffer serves as the data interface between the Bus Master and the SIE. It is a combination
of a 64-byte latched based bi-directional asynchronous FIFO and a single Dword AHB Holding
Register.
USB Interface
The USB interface includes the integrated Root Hub with two external ports, Port 1 and Port 2 as well
as the Serial Interface Engine (SIE) and USB clock generator. The interface combines responsibility
for executing bus transactions requested by the HC as well as the hub and port management specified
by USB.
SIE
The SIE is responsible for managing all transactions to the USB. It controls the bus protocol, packet
generation/extraction, data parallel-to-serial conversion, CRC coding, bit stuffing, and NRZI encoding.
All transactions on the USB are requested from the List Processor and Frame Manager.
Root Hub
The Root Hub is a collection of ports that are individually controlled and a hub that maintains
control/status over functions common to all ports.