Segger J-Link User Manual page 78

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5.2.1.1 Single color indicator (J-Link V7 and earlier)
Indicator status
GREEN, flashing at 10 Hz Emulator enumerates.
GREEN, flickering
GREEN, constant
GREEN, switched off for
10ms once per second
GREEN, flashing at 1 Hz
Table 5.1: J-Link single color main indicator
5.2.1.2 Bi-color indicator (J-Link V8)
Indicator status
GREEN, flashing at 10 Hz Emulator enumerates.
GREEN, flickering
GREEN, constant
GREEN, switched off for
10ms once per second
ORANGE
RED, flashing at 1 Hz
Table 5.2: J-Link single color LED main color indicator
J-Link / J-Trace (UM08001)
CHAPTER 5
Emulator is in operation. Whenever the emulator is exe-
cuting a command, the LED is switched off temporarily.
Flickering speed depends on target interface speed. At
low interface speeds, operations typically take longer and
the "OFF" periods are typically longer than at fast
speeds.
Emulator has enumerated and is in Idle mode.
J-Link heart beat. Will be activated after the emulator
has been in idle mode for at least 7 seconds.
Emulator has a fatal error. This should not normally hap-
pen.
Emulator is in operation. Whenever the emulator is exe-
cuting a command, the LED is switched off temporarily.
Flickering speed depends on target interface speed. At
low interface speeds, operations typically take longer and
the "OFF" periods are typically longer than at fast
speeds.
Emulator has enumerated and is in Idle mode.
J-Link heart beat. Will be activated after the emulator
has been in idle mode for at least 7 seconds.
Reset is active on target.
Emulator has a fatal error. This should not normally hap-
pen.
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Working with J-Link and J-Trace
Meaning
Meaning