Timer Triggering; Trace Triggering; Reset - ETAS FETK-S1.1 User Manual

ETAS
4.11

Timer Triggering

The trigger mode "Timer Triggering" uses four internal timers of the FETK-S1.1
for triggering. A fixed configurable period is used for triggering.
The time intervals between trigger events are in accordance with the config-
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.
4.11.1

Trace Triggering

The FETK-S1.1 provides support for up to 255 trace triggers. The trace triggers
are defined within a section of RAM covered by a trace window. Both the trace
window and trace triggers are defined in the FETK-S1.1 configuration and/or
A2L file. A write by the microcontroller software to a trace trigger location
causes a trace trigger. The trace trigger events to the FETK-S1.1 are synchro-
nous to the microcontroller software. Variables assigned to a measurement
raster using a trace trigger are acquired from the FETK-S1.1 trace mirror, not
directly via DAP. The FETK-S1.1 supports value based data trace trigger up to
255 value.
Requirements for trace triggering by the FETK-S1.1:
• the triggers for different rasters/events have same address, but use dif-
ferent values
• the address must be 32 bit aligned
• the write must be 32 bit width (the upper 24 bits must be '0')
• the value 0x0 is not a valid trigger number
NOTE
It is not possible to use the FETK-S1.1 configured with trace triggers and a
debugger with program / data trace simultaneously.
4.12

Reset

The requirement for the FETK-S1.1 reset mechanism is to ensure that power-
up and power-down behavior of ECU is clean and smooth. The FETK-S1.1 nor-
mally drives /PORST low or upon INCA request.
The signals /PORST and /ESR0 of the microcontroller are used by the FETK-
S1.1 to detect when the ECU is in reset.
The FETK-S1.1 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.
FETK-S1.1 - User's Guide
Hardware Description
27