ETAS
Hardware Description
XETK-S30.0 - User’s Guide
23
4.7
DAP Interface
Fig. 4-6
Equivalent Circuitry of the ECU DAP Interface (ECU)
The XETK-S30.0 operates the Device Access Port (DAP) interface in the 2-pin
mode. The XETK hardware incorporates 22 Ohm series termination resistors
for the output ports DAP0, DAP1, DAP2 and /TRST.
Similiar termination should be considered on the ECU board - depending both
on the layout and on the DAP interface clock rate.
XETK
ETAM3
ETAM2
Aurix
/ TRST
DAP1, TMS
>
=
10
0k
Ubatt1
CAL WAKEUP
( 12V)
GND
ECU
DAP2; TDO
/ TRST
/ WGDIS
DAP0, TCK
TDI
DAP2, TDO
GND
DAP1, TMS
/ PORST
VDD
( Sense)
/ RSTOUT
DAP0, TCK
ESR
0,/ HDRST
1
2
9
10
V
DDS
R
A
M
TDI
the
voltage
of
the
ED
RAM
R
XE
T
K
=0
R
EC
U
=0
the
voltage
of
the
ED
RAM
OR
permanent
power
supply
the
voltage
of
the
ED
RAM
Power
supply
of
the
ED
RAM:
Option
1:
provided
by
XETK
Option
2:provided
by
ECU
(or
XETK),
solder
pad
to
monitor
(VDDSRAM)
required!
Solder pad
/ WGDIS
circuit
/ PORST
VDDSTBY
(1 ,3V)
VDDPSTBY
(3 ,3V)
Ubatt2
2nd
power
supply
permanent
or
switched
6
optional
DAP 2
not
used
today
Aurix
2 .
ECU:
supply
1.
XETK:
supply
and
monitor
2. XETK:
monitor
