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ETAS
Hardware Description
BR_XETK-S4.0
-
User
Guide
22
4.6
SWD Interface
Fig.
4
-
7
Equivalent Circuitry of the ECU SWD Interface (ECU)
The BR_XETK-S4.0 operates the Single Wire Debug (SWD) interface
The XETK hardware incorporates 22 Ohm series termination resistors for the
output ports SWCLK, SWDIO, TDO and /TRST.
Similar termination should be considered on the ECU board - depending both
on the layout and on the SWD interface clock rate.
/TRST
SWDIO
TDO
/TRST
/WGDIS
SWCLK
TDI
TDO
GND
SWDIO
/PORST
VDD
(Sense)
/RESETOUT
(ESR0)
SWCLK
ESR0
2
9
10
TDI
/WGDIS circuit
/PORST
VDD
1
STM
SR6
Ubatt1
CAL WAKEUP (12V)
GND
1
Ubatt1: Permanent power supply (e.g. K30)
(ECU internal or external)
powersupply of the ED RAM:
provided by BR_XETK
do not use with Sr6P7x Cut1
VDDSTBY (0,999V)
VDDPSTBY (3,3V)
Ubatt2: If permanent power supply is external,
connect to an additional ECU internal voltage (e.g. K15)
6
optional
Ubatt2
ECU
BR_XETK
ETAM8
ETAM2