參數(shù)資料
型號(hào): ST92F150JD
英文描述: ST9 - 8/16-BIT SINGLE VOLTAGE FLASH MCU FAMILY WITH RAM. E3 TM (EMULATED EEPROM). CAN 2.0B AND J1850 BLPD
中文描述: ST9 - 16位產(chǎn)品單電壓閃存微控制器的RAM家庭。 E3類商標(biāo)(模擬的EEPROM)。的CAN 2.0b和J1850 BLPD
文件頁(yè)數(shù): 240/324頁(yè)
文件大?。?/td> 3655K
代理商: ST92F150JD
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J1850 Byte Level Protocol Decoder (JBLPD)
J1850 BYTE LEVEL PROTOCOL DECODER
(Cont’d)
10.8.3 Functional Description
10.8.3.1 J1850 protocol symbols
J1850 symbols are defined as a duration (in micro-
seconds or clock cycles) and a state which can be
either an active state (logic high level on VPWO)
or a passive state (logic low level on VPWO).
An idle J1850 bus is in a passive state.
Any symbol begins by changing the state of the
VPW line. The line is in this state for a specific du-
ration depending on the symbol being transmitted.
Durations, and hence symbols, are measured as
time between successive state transitions. Each
symbol has only one level transition of a specific
duration.
Symbols for logic zero and one data bits can be ei-
ther a high or a low level, but all other symbols are
defined at only one level.
Each symbol is placed directly next to another.
Therefore, every level transition means that anoth-
er symbol has begun.
Data bits of a logic zero are either a short duration
if in a passive state or a long duration if in an active
state. Data bits of a logic one are either a long du-
ration if in a passive state or a short duration if in
an active state. This ensures that data logic zeros
predominate during bus arbitration.
An eight bit data byte transmission will always
have eight transitions. For all data byte and CRC
byte transfers, the first bit is a passive state and
the last bit is an active state.
For the duration of the VPW, symbols are ex-
pressed in terms of Tv’s (or VPW mode timing val-
ues). J1850 symbols and Tv values are described
in the SAE J1850 specification, in
Table 1
and in
Table 2
.
An ignored Tv I.D. occurs for level transitions
which occur in less than the minimum time re-
quired for an invalid bit detect. The VPW encoder
does not recognize these characters as they are
filtered out by the digital filter. The VPW decoder
does not resynchronize its counter with either
edge of “ignored” pulses. Therefore, the counter
which times symbols continues to time from the
last transition which occurred after a valid symbol
(including the invalid bit symbol) was recognized.
A symbol recognized as an invalid bit will resyn-
chronize the VPW decoder to the invalid bit edges.
In the case of the reception of an invalid bit, the
JBLPD peripheral will set the IBD bit in the ER-
ROR register. The JBLPD peripheral shall termi-
nate any transmissions in progress, and disable
receive transfers and RDRF flags until the VPW
decoder recognizes a valid EOF symbol from the
bus.
The JBLPD’s state machine handles all the Tv
l.D.s in accordance with the SAE J1850 specifica-
tion.
Note:
Depending on the value of a control bit, the
polarity of the VPWI input can be the same as the
J1850 bus or inverted with respect to it.
Table 45. J1850 Symbol definitions
Table 46. J1850 VPW Mode Timing Value (Tv)
definitions (in clock cycles)
Symbol
Definition
Passive for Tv1 or
Active for Tv2
Passive for Tv2 or
Active for Tv1
Active for Tv3
Passive for Tv3
Passive for Tv4
Data Bit Zero
Data Bit One
Start of Frame (SOF)
End of Data (EOD)
End of Frame (EOF)
Inter Frame Separation
(IFS)
IDLE Bus Condition (IDLE) Passive for > Tv6
Passive for Tv6
Normalization Bit (NB)
Active for Tv1 or
Tv2
Active for Tv5
Break (BRK)
Pulse
Width or Tv
I.D.
Ignored
Invalid Bit
Tv1
Tv2
Tv3
Tv4
Tv5
Tv6
Minimum
Duration
Nominal
Duration
Maximum
Duration
0
>7
>34
>96
>163
>239
>239
>280
N/A
N/A
64
128
200
280
300
300
<=7
<=34
<=96
<=163
<=239
N/A
N/A
N/A
9
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