Segger J-Link User Manual page 291

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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
JTAG scan chain with multiple devices
The JTAG scan chain allows to specify the instruction register organization of the target
system. This may be needed if there are more devices located on the target system than
the ARM chip you want to access or if more than one target system is connected to one
J-Link at once.
J-Link / J-Trace (UM08001)
CHAPTER 12
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