參數(shù)資料
型號(hào)： MC68HC705V8CFN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數(shù)： 41/172頁
文件大?。?/td> 615K
代理商： MC68HC705V8CFN
MOTOROLA
SECTION 15: MESSAGE DATA LINK CONTROLLER
Page 124
MC68HC705V8 Specification Rev. 2.1
15.5.4.4
Valid EOD Symbol
If the passive to active transition beginning the next data bit or symbol occurs between
c
and
d, the current symbol would be considered a valid EOD symbol. See Figure 15-12(4).
15.5.4.5
Valid EOF & IFS Symbol
If the passive to active transition beginning the SOF symbol of the next message occurs
between
a and b, the current symbol will be considered a valid EOF symbol. If the passive
to active transition 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 IFS symbol.
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, anytime 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. See Figure 15-13(1&2).
15.5.4.6
Idle Bus
If the passive to active transition beginning the 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.
cd
(2) Valid EOF+
IFS Symbol
280
s
580
s
ab
(1) Valid EOF
Symbol
Figure 15-13:
J1850 VPW EOF and IFS Symbols
Active
Passive
Active
Passive
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