ARM JTAG

[Peter (Gast)]

Weiss einer warum beim ARM JTAG Adapter 20 Pin Steckverbinder genutzt
werden. Sind doch die gleichen Signale wie beim AVR dran. 10 Pins tuns
doch auch, wegen dem Platzbedarf.

[Peter (Gast)]

Weil es bei dem ARM JTAG Stecker noch mehrer Signale, gibt, und dieser
einheitlich gehalten wird..
Wenn du keinen Platz hast kannst du aber auch gerne kleinere Stecker
nehmen mit TDI TDO TMS und TCK
Pin

Signal
Type
Description
1
VTref
Input
This is the target reference voltage.
It is used to check if the target has power to create the logic-level
reference for the input comparators and controls the output logic
levels to the target. It is normally fed from Vdd on the target board
and must not have a series resistor.

2
Vsupply
NC
This pin is not connected in J-Link.
It is reserved for compatibility with other equipment.
Connect to Vdd or leave open in target system.

3
nTRST
Output
JTAG designation: Test ReSeT output signal (optional signal).
Typically connected to nTRST on the target, this signal is not
mandatory and can be left unconnected.

4
GND
-
Common ground

5
TDI
Output
JTAG designation: Test Data In signal.
Typically connected to TDI on target, this signal is the data output
wire.

6
GND
-
Common ground

7
TMS
Output
JTAG designation: Test Mode Select signal input at target level.
Typically connected to TMS on target CPU.

8
GND
-
Common ground

9
TCK
Output
JTAG designation: Test ClocK signal.
Typically connected to TCK on target CPU.

10
GND
-
Common ground

11
RTCK
NC
This pin is not used by the SAM-ICE.
It is reserved for compatibility with other equipment to be used as
Return Test CloCK signal from target JTAG port. Connect to RTCK if
available, otherwise to GND.

12
GND
-
Common ground

13
TDO
Input
JTAG designation: Test Data Output signal.
Typically connected to TDO on target, this signal is the data input
wire.

14
GND
-
Common ground

15
RESET
I/O
RESET signal.
This reset is the system reset from the target.

16
GND
-
Common ground

17
DBGRQ
NC
This pin is not connected in SAM-ICE.
It is reserved for compatibility with other equipment to be used as a
debug request signal to the target system. Typically connected to DBGRQ
if available, otherwise can be left unconnected.

18
GND
-
Common ground

19
DBGACK
NC
This pin is not connected in SAM-ICE.
It is reserved for compatibility with other equipment to be used as
debug acknowledge signal from the target system. Typically can be left
unconnected.

20
GND
-
Common ground

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