ETAS
Hardware Description
XETK-S21.0B
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User
Guide
17
through the calibration and development system. Using an additional measure
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ment data memory area, the ECU microcontroller can provide data to the cali
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bration and development system by buffering the data (DISTAB13) and
triggering the XETK to read the data via JTAG. The XETK then reads, buffers,
processes and sends this measured data to the PC.
If no additional measurement data memory is available, the XETK-S21.0 can
alternatively read the data to be measured directly from the microcontroller’s
memory. This process is Triggered Direct Measurement (TDM) with DISTAB13.
The 100 Mbit/s XETK Ethernet interface provides communication with the PC.
The power supply for the XETK-S21.0 is provided by a switch mode power sup
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ply, to minimize power dissipation.
4.2
ECU Interface
The XETK-S21.0 is connected via connectors CON6 and CON7 to the ECU with
two adapter cables (refer to Fig.
17). The pin definition depends on
the application and the microcontroller type. In general the ECU interface con
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sists of
• 1 ECU voltage line, which is not used for XETK power supply, but only for
detection of the ECU status, therefore the power consumption on this
line is negligible (refer to chapter
20)
• 1 Reset line which allows the XETK to control the system reset of the
ECU
• 1 Reset line which allows the XETK to monitor the system reset of the
ECU
• 5 Debug line interfaces for the communication between the XETK-S21.0
and the microcontroller
• 2 ground lines for proper shielding of the ECU interface lines.
Fig.
4
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2
Location of the ECU Interfaces
CON6
CON7
