ETAS
Hardware Description
BR_XETK-S3.0
-
User Guide
22
4.6
DAP Interface
Fig.
4
-
7
Equivalent Circuitry of the ECU DAP Interface (ECU)
The BR_XETK-S3.0 operates the Device Access Port (DAP) interface in the 2-pin
or in the 3-pin DAP mode.
The XETK hardware incorporates 22 Ohm series termination resistors for the
output ports DAP0, DAP1, DAP2 and /TRST.
Similar termination should be considered on the ECU board - depending both
on the layout and on the DAP interface clock rate.
NOTE
Power Supply of the ED RAM: Use only with supported controllers
BR_XETK
ETAM8
ETAM2
/TRST
DAP1
/PORST
Ubatt
GND
VDDSTBY
DAP2
/TRST
/WDGDIS
DAP0
TDI
DAP2
GND
DAP1
/PORST
VDDP
(Sense)
/RSTOUT
DAP0
ESR0
1
2
9
10
VDDSB
TDI
XETK: supplies
and
monitors
the voltage of the ED RAM
R
XE
TK
=
0
permanent power supply
Power supply of the ED RAM
provided by XETK
ECU
/WDGDIS circuit
Aurix
e.g. to VEXT via 200 ohm resistor
VEXT
Pullups
1
(12V)
CAL WAKEUP