Silicon Laboratories Stepper Machine Specifications download pdf (Page 21)

Silicon Labs Serial Interface Engine (SIE)

 Serial Interface Engine (SIE) is part of the USB

hardware and handles data communications to

the host in hardware

 Handles the handshake between the endpoint

and the host device

 Generates an interrupt when valid data packets

received

 Will not interrupt the CPU when an error in

transmission occurs

 Moves valid data to/from the endpoint FIFOs

 Firmware only needs to be concerned with the

data transferred

 Handles all the bit stuffing required

5478Bits

CRCEndpointAddressPIDFieldToken Packet

format:

5118Bits

CRCFrame NumberPIDFieldSOF Packet

format:

160-10238Bits

CRCDataPIDFieldData Packet

format:

8Bits

PIDField

Handshake

Packet format:

SIE Handles

error checking

ACK

NAK

SIE Handles

handshaking

Firmware

interfaces

The hardware inside the MCU handles the low level communications in

conformance with the USB specification. The integrated transceiver handles all of

the electrical requirements for the differential signaling and the pull-ups etc. The

Serial Interface Engine (SIE) is a powerful peripheral that provides all of the low

level error checking and packet handling. When the packets come in from the host

the SIE will determine if the packet is valid based on the address and endpoint

number specified. It will also automatically generate the appropriate handshake

packet based on the current state of the MCU. The USB peripheral integrated

provides two interface points: the USB FIFOs and the USB control, status and

interrupt interfaces to the C8051F core. That is where the firmware developer can

read and write the data to be transferred as well as set the state of the USB

peripheral and service interrupts.

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Silicon Laboratories Stepper Machine Specifications Page 21

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