User manual

14
SAM4S-WPIR-RD [USER GUIDE]
42060A–ATARM–12/2012
4.3.2 USB Micro AB
Figure 4-11. USB Device Micro-B Connector J1
Table 4-4. USB Device Micro-B Connector J1 Signal Descriptions
10 GND Common ground
11
RTCK - 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 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.
12 GND Common ground
13
TDO JTAG TEST DATA OUTPUT - Serial
data input from the target.
JTAG data output from target CPU. Typically connected to TDO on target CPU.
14 GND Common ground
15 nSRST RESET Active-low reset signal. Target CPU reset signal.
16 GND Common ground
17 RFU This pin is not connected in SAM-ICE.
18 GND Common ground
19 RFU This pin is not connected in SAM-ICE.
20 GND Common ground
Pin Mnemonic Description
Pin Mnemonic Description
1 Vbus 5v power
2 DM Data minus
3 DP Data plus
4 ID Not used
5 GND Common ground