ETAS
Hardware Description
XETK-S22.0 - User’s Guide
26
4.10
XETK-S22.0D: JTAG and Aurora Interface
Fig. 4-9
Equivalent Circuitry of the ECU JTAG & Aurora Interface (ECU)
The ECU part of the JTAG and Aurora XETK interface is depicted in Fig. 4-9.
The use of both JTAG and Aurora requires the ECU to use a 34 pin Samtec
connector for interfacing to the XETK-S22.0D. The same JTAG interface
described in section 4.9 is used with mapping to the 34pin Samtec in Fig. 4-9. It
is recommended to use 1nF capacitors on the ECU PCB for the /-
signals.
Additional Aurora Design Recommendations:
• Debug and trace connectors should be placed as close to the microcon-
troller as possible
• PCB trace lengths should be as short a possible for the TX0_P, TX0_N,
AUR0-, ClockP, and ClockN signals
• PCB trace lengths should be matched for the differential pairs TX0_P
and TX0_N. PCB trace lengths should also be matched for the differen-
tial pairs ClockP and ClockN.
• It is not recommended to T (fork/split) any Aurora Trace PCB signals
• All signals on the ETAN2 and ETAN7 cables are 50 ohm impedance
except the Aurora Trace signals (1, 3, 26, 28), it is recommended to
match the PCB impedance to the cable impedance
• Aurora Trace signals on the ETAN2 and ETAN7 cables are 100 ohm dif-
ferential pairs
ETAN2/7
ETAM2/5/9
TMS
TCK
/RES_IN
VDDPSTBY
(ECU
interface)
GND
VDDSTBY
(ERAM)
CAL
Wakeup
RH850
TDO
TX0_N
VDD(Sense)
TMS
TCK
TX0_P
GND
TDO
TDI
TDI
/RES_OUT
1
2
EM
U
V
D
D
/TRST
/DRDY
1.
XETK:
supply
and
monitor
the
voltage
of
the
ERAM
R
X
ET
K
=
0
R
E
C
U
=
0
2.
ECU:
supply
the
voltage
of
the
ERAM
OR
Permanent
Power
supply
(External
supply
of
UBATT,
if
not
available
internal))
UBATT1
Power
supply
of
the
ERAM:
Option
1:
provided
by
XETK
Option
2:
provided
by
ECU
/TRST
GND
MD0
UBATT2
6
Notes:
‐
ETAM9
does
not
provide
pin
6
‐
ECU
connection
is
5
pin
Molex
or
solder
points
Permanent
Power
supply
(Internal
UBATT,
else
internal
ignition)
1
FLMD0
EVTO
GND
/PORST
GND
GND
WDGDIS
AURORA_RST
Clock_P
GND
Clock_N
GND
/RSTOUT
RDY
VSTBY
19
20
09
10
30
29
34
33
>=
1
0
0
k
If
a
pull
down
is
present,
it
must
be
>=
100k
AURCLK
‐
AUR0+
AUR0
‐
VDD
VDD
VDD
1nF
1nF
Содержание XETK-S22.0
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