ETAS
Hardware Description
FETK-T3.0 - User’s Guide
26
4.8.2
Measurement Data Access
The FETK-T3.0 is a serial FETK, so all data to be measured is located in the ECU
memory. It can be read out by the FETK-T3.0 using the JTAG interface in two
ways:
• Trace measurement using the Aurora trace interface
• Read accesses using the JTAG interface
4.8.2.1
Trace Measurement
The microcontrollers ability to send trace messages over the Aurora interface
is used to forward any write access to measurement data to the FETK-T3.0.
The FETK-T3.0 combines the processing of this data trace messages with an
initial direct read of the configured measurement data to an always up to date
mirror of the measurement data in the ECU.
The current values will be sent from the FETK to INCA every time the ECU soft-
ware issues the corresponding trace trigger. For details on trace trigger (refer
to chapter 4.10.2 on page 29). The FETK-T3.0 does the complete configuration
of the microcontroller for trace based measurement. No ECU software is
required for the configuration.
4.8.2.2
Direct Measurement
The FETK-T3.0 reads the measurement data through the JTAG interface.
The read action will be executed by the FETK-T3.0, when it is invoked by a hard-
ware trigger (refer chapter 4.10.4 on page 30).
Due to the throughput limitations of the JTAG interface, this method is not as
suitable for high speed measurement as the Trace Measurement.