BeagleBoard XM C2, Reference Manual

Page: 130 / 163

REF: BB_SRM_xM
BeagleBoard-xM System
Reference Manual
Revision C2
Page 130 of 163
8.8 JTAG
Figure 70 is the JTAG connector pin out showing the pin numbering.
Figure 70. JTAG Connector Pinout
Table 39 gives a definition of each of the signals on the JTAG header.
Table 39. JTAG Signals
Pin Signal Description I/O
1 JTAG_TMS Test mode select I/O
3 JTAG_TDI Test data input I
7 JTAG_TDO Test Data Output O
9 JTAG_RTCK ARM Clock Emulation O
11 JTAG_TCK Test Clock I
2 JTAG_nTRST Test reset I
13 JTAG_EMU0 Test emulation 0 I/O
14 JTAG_EMU1 Test emulation 1 I/O
5 VIO Voltage pin PWR
4,8,10,12,14 GND Ground PWR
All of the signals are 1.8V only. The JTAG emulator must support 1.8V signals for use
on the BeagleBoard.