XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 502
XC908AS60ACFU
Manufacturer Part Number
XC908AS60ACFU
Description
MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
Manufacturer
Motorola Semiconductor Products
Datasheet
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Byte Data Link Controller (BDLC)
Technical Data
502
Valid EOF and IFS Symbol
Idle Bus
ACTIVE
PASSIVE
ACTIVE
PASSIVE
In
beginning the SOF symbol of the next message occurs between a
and b, the current symbol will be considered a valid end-of-frame
(EOF) symbol.
See
beginning the SOF symbol of the next message occurs between c
and d, the current symbol will be considered a valid EOF symbol
followed by a valid inter-frame separation symbol (IFS). All nodes
must wait until a valid IFS symbol time has expired before beginning
transmission. However, due to variations in clock frequencies and bus
loading, some nodes may recognize a valid IFS symbol before others
and immediately begin transmitting. Therefore, any time a node
waiting to transmit detects a passive-to-active transition once a valid
EOF has been detected, it should immediately begin transmission,
initiating the arbitration process.
In
beginning the start-of-frame (SOF) symbol of the next message does
not occur before d, the bus is considered to be idle, and any node
wishing to transmit a message may do so immediately.
Figure
Figure
Figure
Byte Data Link Controller (BDLC)
27-8(1), if the passive-to-active received transition
27-8(2), if the passive-to-active received transition
Figure 27-8. J1850 VPW Received Passive
27-8(2). If the passive-to-active received transition
280 µ s
EOF and IFS Symbol Times
300 µ s
a
b
c
MC68HC908AZ60A — Rev 2.0
d
(1) VALID EOF SYMBOL
(2) VALID EOF+
IFS SYMBOL
MOTOROLA
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