参数资料
型号: MC68HC05V7CB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封装: SDIP-56
文件页数: 39/170页
文件大小: 980K
代理商: MC68HC05V7CB
SECTION 15: MESSAGE DATA LINK CONTROLLER
MOTOROLA
Page 119
MC68HC05V7 Specification Rev. 1.0
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
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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