Q: Which CPUs are supported?
A: J-Link can be used with any ARM7 / ARM9 core.

Q: What is the maximum JTAG speed supported by J-Link / J-Trace?
A: J-Link?s/J-Trace?s maximum supported JTAG speed is 12MHz.

Q: What is the maximum download speed?
A: The maximum download speed is currently about 720 Kbytes/second when downloading into RAM; Communication with a RAM-image via DCC can be a lot faster.
However, the actual speed depends on various factors, such as JTAG, clock speed, host CPU core etc.

Q: Can I access individual ICE registers via J-Link / J-Trace?
A: Yes, you can access all individual ICE registers via J-Link / J-Trace.

Q: I want to write my own application and use J-Link / J-Trace. Is this possible?
A: Yes. We offer a dedicated Software Developer Kit (SDK). See section J-Link Software Developer Kit (SDK).

Q: Can I use J-Link / J-Trace to communicate with a running target via DCC?
A: Yes. The DLL includes functions to communicate via DCC. However, you can also program DCC communication yourself by accessing the relevant ICE registers through J-Link / J-Trace.

Q: Can J-Link / J-Trace read back the status of the JTAG pins?
A: Yes, the status of all pins can be read. This includes the outputs of J-Link / J-Trace as well as the supply voltage, which can be useful to detect hardware problems on the target system.

Q: J-Link / J-Trace is quite inexpensive. What is the advantage of some more expensive JTAG probes?
A: Some of the more expensive JTAG probes offered by other manufacturers support higher download speeds or an ethernet interface. The functionality is similar, there is no real advantage of using more expensive probes. J-Link / J-Trace is a suitable solution for the majority of development tasks as well as for production purposes. Some features that are available for J-Link / J-Trace, such as a DLL, exposing the full functionality of the emulator, flash download and flash breakpoints are not available for most of these emulators.

Q: Does J-Link support the embedded trace macro (ETM)?
A: No. ETM requires another connection to the ARM chip and a CPU with built-in ETM. Most current ARM7 / ARM9 chips do not have ETM built-in.

Q: Why does J-Link / J-Trace - in contrast to most other JTAG emulators for ARM cores - not require the user to specify a cache clean area?
A: J-Link / J-Trace handles cache cleaning directly through JTAG commands. Unlike other emulators, it does not have to download code to the target system. This makes setting up J-Link / J-Trace easier. Therefore, a cache clean area is not required.