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23 | Hardware Description
3.7
DAP Interface
ECU
2. ECU: supply
the voltage of the ED RAM
Fig. 3-6
The BR_XETK-S1.0 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.
3.8
Trigger Modes: Overview
The BR_XETK-S1.0 supports the following trigger modes:
- Pinless triggering
- Timer triggering
The trigger mode "Pinless Triggering" uses the microcontroller's internal Develop-
ment Trigger Semaphore (DTS) for triggering. See also chapter "Pinless Trigger-
ing" on page 24.
The trigger mode "Timer Triggering" uses four internal timers of the XETK for trig-
gering. See also chapter "Timer Triggering" on page 24.
ETAS BR_XETK-S1.0 | User Guide
permanent power supply
1. XETK: supply and monitor
the voltage of the ED RAM
2.XETK: monitor
the voltage of the ED RAM
OR
TMS
/TRST
TCK
TDO
TDI
Aurix
/PORST
ESR0
Equivalent Circuitry of the ECU DAP Interface (ECU)
1
Ubatt
CAL WAKEUP
(12V)
GND
VDDPSTBY
(1,25V) (I/O)
VDDPSTBY
sense (I)
Power supply of the ED RAM:
Option 1: provided by XETK
Option 2: provided by ECU
2
TCK
GND
TDO
/TRST
TDI
TMS
VDDP
/WGDIS
(Sense)
10
9
/PORST
/RSTOUT
/WGDIS circuit
BR_XETK
ETAM2
ETAM3
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