ETAS
Hardware Description
FETK-T1.1
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User
Guide
28
Application running
To generate triggers, the ECU software sets bits in the trigger register
"CBS_TRIG" by writing the associated bits in the trigger setting register
"CBS_TRIGS".
Each bit of the trigger setting register "CBS_TRIGS" corresponds to a bit in the
same position in the trigger register "CBS_TRIG", each of them corresponding
to an FETK hardware trigger.
The FETK periodically polls the trigger register "CBS_TRIG" via IO_READ_TRIG
for detecting triggers. The polling rate is determined by the fastest measure
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ment raster and is configurable with a 50 µs default.
Active bits in trigger register "CBS_TRIG" are automatically cleared by the CPU
when the register is read by the FETK-T1.1 via IO_READ_TRIG. For generating
triggers, the ECU software sets bits in the trigger register "CBS_TRIG" by writing
the associated bits in the trigger setting register "CBS_TRIGS".
4.10.4
Timer Triggering
The trigger mode "Timer Triggering" uses four internal timers of the FETK-T1.1
for triggering. A fixed configurable period is used for triggering.
The time intervals between trigger events are in accordance with the config
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ured timer values. This values and their resolution have to be defined in the A2L
file. Available settings are:
• Minimum time interval 100
µs
• Maximum period duration 1
s
• Timer resolution 1
µs
The timers work in an asynchronous manner to the ECU.
4.11
Reset
The requirement for the FETK-T1.1 reset mechanism is to ensure that power-
up and power-down behavior of ECU is clean and smooth. The FETK-T1.1 gen
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erates a /PORST on user request, only. In case of a reconfiguration of the FETK-
T1.1 INCA asks the user if a reset shall be performed
The signals /PORST and /ESR0 of the microcontroller are used by the FETK-
T1.1 to detect when the ECU is in reset.
The FETK-T1.1 senses the switched ECU power supply. This allows it to detect
when the ECU is off and forward this information to INCA. In addition, it allows
the FETK to enter the power save mode with the calibration system unplugged.
NOTE
The reset signal /PORST can be hold or pulled low while the FETK-T1.1 is
booting depending on the use the adapter ETAM8A or the adapter ETAM8B
(see chapter “ETAM8 Adapter” on page
68). The FETK-T1.1 has to be config
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ured in the XCT tool according to the needed reset signal characteristic
during FETK-T1.1 standby.