參數(shù)資料
型號(hào)： TSS461E
廠(chǎng)商： Atmel Corp.
英文描述： VAN Data Link Controller
中文描述： 凡數(shù)據(jù)鏈路控制器
文件頁(yè)數(shù)： 20/57頁(yè)
文件大小： 817K
代理商： TSS461E
20
TSS461E
4194B–AUTO–12/04
Status bits give permanent information on the diagnosis performed, whatever the pro-
grammed operating mode. This is encoded over three bits: Sa, Sb and Sc. Sa and Sb
bits indicate the four possible states of the VAN bus.
Table 3.
Status Bits Sa and Sb
Notes:
1. Sc bit sets to 1 as soon as one of the three inputs (RXD2, RXD1, RXD0) differs from
the others in the input comparison analysis performed by the diagnosis system, S2 is
set.
2. The only way to reset this status bit is through the RI signal or a general reset.
Internal Operations
Digital Filtering
If several spurious pulses occur during one bit, the diagnosis for defective conductor
may be corrupted. To avoid such errors, digital filters are implemented.
Filtering operation is based on sampling of the comparator output signals. A transition is
taken into account only if it is observed over five samples (1/16th of timeslot).
Transition Analyses
These analyses are continuously done on the effective edges on comparators after digi-
tal filtering.
Asynchronous diagnosis:
The asynchronous diagnosis is done by comparing the number of edges on DATA
and DATA.
If four edges are detected on one input and no edges on the other during the same
period, the second input is considered faulty and the diagnosis mode will change to
one of the degraded modes.
Synchronous diagnosis:
The synchronous diagnosis counts the number of edges on the data input
connected to the reception logic during one SDC period.
Sa
Sb
Communication
0
0
Mode
nominal
Fault
no fault on VAN bus
Status
differential communication DATA and DATA
0
1
Mode
degraded on DATA
Fault
fault on DATA
Status
communication on DATA
1
0
Mode
degraded on DATA
Fault
fault on DATA
Status
communication on DATA
1
1
Mode
major error
Fault
fault on DATA and DATA
Status
no communication on DATA and DATA (attempt to
communicate alternatively on DATA then
DATA
every
SDC period.
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相關(guān)代理商/技術(shù)參數(shù)
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TSS461E_06 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:VAN Data Link Controller
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