ZAMC4100 Datasheet, PDF (118/155 Pages) Integrated Device Technology – Actuator and Motor Controller

ZAMC4100 Datasheet
4.9.2. The BREAK/SYNC Field Detector
As described in the LIN standard, each transaction on the bus is initiated by the LIN master sending the header of
a LIN frame. This header consists of the BREAK field, the SYNC field, and the PID field. The first two fields are
used by the slave to determine the baud rate used for the rest of the transaction while the PID is used to
determine the type of the transaction (receive response; transmit response; do nothing). To enable the slave to
receive the PID, the baud rate must be detected before the START bit of the PID field. As a new BREAK and
SYNC field can occur at any time, an active transaction is interrupted when those fields are detected.
Figure 4.7 Structure of LIN Frame
FRAME
HEADER
RESPONSE SPACE
RESPONSE
BREAK
FIELD
SYNC
FIELD
PROTECTED
IDENTIFIER
FIELD
INTER-BYTE SPACE
DATA-1
DATA-2
DATA-N
CHECKSUM
INTER-BYTE SPACE
4.9.3. SW-LIN Data Unit
The data unit handles the reception and transmission of bytes (PID, DATA, and CRC as described in the LIN
standard). It contains all registers accessible by the user and generates the interrupt (Figure 4.8).
Figure 4.8 Block Diagram of the LIN Data Unit
LINIRQEN
LINCFG
LINSTATUS
BAUDRATE
LIN
CONTROL
LOGIC
RXD
TXD
IRQ
RXBIT
TXBIT
SHIFTREG
RxBUF TxBUF
LINDATA
© 2016 Integrated Device Technology, Inc.
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January 26, 2016