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Section 2
Hardware
2.1
2.1.1
JTAG Connector
A SAM-ICE connector is a 20-way Insulation Displacement Connector (IDC) keyed box header (2.54 mm
male) that mates with IDC sockets mounted on a ribbon cable.
Pinout
Table 2-1 lists the SAM-ICE JTAG pinout.
Table 2-1. Pinout
Pin
Signal
Type
Description
This is the target reference voltage.
1
VTref
Input
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.
This pin is not connected in SAM-ICE.
2
Vsupply
NC
It is reserved for compatibility with other equipment.
Connect to Vdd or leave open in target system.
JTAG Reset. Output from SAM-ICE to the Reset signal on the target JTAG port.
3
nTRST
Output
Typically connected to nTRST on the target CPU. This pin is normally pulled HIGH on the target
to avoid unintentional resets when there is no connection.
4
GND
-
Common ground
JTAG data input of target CPU.
5
TDI
Output
It is recommended that this pin is pulled to a defined state on the target board. Typically
connected to TDI on target CPU.
6
GND
-
Common ground
JTAG mode set input of target CPU.
7
TMS
Output
This pin should be pulled up on the target.
Typically connected to TMS on target CPU.
8
GND
-
Common ground
JTAG clock signal to target CPU.
9
TCK
Output
It is recommended that this pin is pulled to a defined state on the target board. Typically
connected to TCK on target CPU.
10
GND
-
Common ground
Input Return test clock signal from the target. Some targets must synchronize the JTAG inputs to
internal clocks. To assist in meeting this requirement, a returned and retimed TCK can be used
11
RTCK
NC
to dynamically control the TCK rate. SAM-ICE supports adaptive clocking which waits for TCK
changes to be echoed correctly before making further changes. Connect to RTCK if available,
otherwise to GND.
AT91SAM-ICE User Guide
2-1
6206C–ATARM–13-Feb-12
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