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The serial interface engine (SIE) handles all of the low level processing of the incoming packets from the host and outgoing packets from the MCU. Shown in this slide are the packets defined by the USB specification. The SIE is responsible for monitoring the data as it is received and checking the validity of the complete packet. If for some reason that packet is invalid the SIE will discard the packet and not store it in the FIFO. If the packet is valid, the SIE will pass the packet to the FIFO. This limits the firmware overhead required to service the USB data transfers.
PTM Published on: 2011-06-01
Austria