ETAS
Hardware Description
BR_XETK-S1.0 - User’s Guide
23
4.7
DAP Interface
Fig. 4-6
Equivalent Circuitry of the ECU DAP Interface (ECU)
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.
4.8
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 Devel-
opment Trigger Semaphore (DTS) for triggering. See also chapter “Pinless Trig-
gering” on page 24.
The trigger mode "Timer Triggering" uses four internal timers of the XETK for
triggering. See also chapter “Timer Triggering” on page 24.
BR_XETK
ETAM3
ETAM2
/TRST
TMS
/PORST
Ubatt
GND
CAL WAKEUP
(12V)
VDDPSTBY
(1,25V)
(I/O)
TDO
/TRST
/WGDIS
TCK
TDI
TDO
GND
TMS
/PORST
VDDP
(Sense)
/RSTOUT
TCK
ESR0
1
2
9
10
V
DDS
R
A
M
TDI
1.
XETK:
supply
and
monitor
the
voltage
of
the
ED
RAM
R
XETK
=
0
R
EC
U
=
0
2.
ECU:
supply
the
voltage
of
the
ED
RAM
OR
permanent
power
supply
VDDPSTBY
sense
(I)
2.XETK:
monitor
the
voltage
of
the
ED
RAM
Power
supply
of
the
ED
RAM:
Option
1:
provided
by
XETK
Option
2:
provided
by
ECU
ECU
/WGDIS
circuit
Aurix
