348 CHAPTER 12 RDI
J-Link / J-Trace (UM08001) ©
2004-2017 SEGGER Microcontroller GmbH & Co. KG
12.4.4.3 JTAG tab
JTAG speed
This allows the selection of the JTAG speed. There are basically three types of speed
settings (which are explained below):
• Fixed JTAG speed
• Automatic JTAG speed
• Adaptive clocking
For more information about the different speed settings supported by J-Link, please
refer to
JTAG Speed on page 184.
JTAG scan chain with multiple devices
The JTAG scan chain allows to specify the instruction register organization of the tar-
get system. This may be needed if there are more devices located on the target sys-
tem than the ARM chip you want to access or if more than one target system is
connected to one J-Link at once.
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