Reference Manual

Self Test and Supervision
The Boot Test returns a state that indicates failure or success. However,
the test will terminate permanently if a Read/Write-memory failure is
detected. This causes a reset of the processor. The function can be
upgraded remotely by replacing parts of the boot software.
40.3.2 X-Bus Receiver Test
Purpose
To detect any faults on the X-Bus before the SW Power Boost is started.
Preconditions and Initiation
Initiated by the functionality administration when an AO TX instance
that is configured for SW Power Boost is enabled.
Description
The X-Bus receiver on the master TX and slave TX is tested by sending
a test message on the X-Bus. It is terminated by reporting the outcome
of the test.
40.4 Supervision of Memory
Purpose
Controlling the correctness of the memory contents.
Preconditions and Initiation
The Boot Test is carried out before any normal application processes
are started. The function Restart and Recovery invokes the test.
Description
There are two kinds of memory, Read/Write memory and a Read only
memory.
The Read/Write memory is supervised by parity checking. A parity bit
is added to the data and is chosen so that the number of 1 bits in the
data is even (or odd). For example, when using even parity the data
1011001 becomes 101101011 and the data 10110001 becomes
101100010. Parity bits are added when writing data to the memory and
these bits are checked when reading the same data from the memory. If
the parity bits are not even (or odd) a fault has occurred in the data.
The read only memory (and memory of non-volatile character such as
Flash and EEPROM) is supervised by continuous control checksum
(CRC-32). When copying a data burst from a non-volatile memory to a
volatile memory both the original data burst and the copy must be
checked. If a fault is detected the fault is reported to the fault handling
functions.
306 (421)
EN/LZT 720 0008 R1A
2001-06-26
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