J-Link is a powerful JTAG emulator developed by SEGGER, specifically designed to support the simulation and debugging of ARM core microcontrollers. It is compatible with a wide range of ARM architectures, including ARM7, ARM9, ARM11, Cortex-M0, M1, M3, M4, Cortex-A5, A8, A9, and more. The device seamlessly integrates with popular development environments such as IAR EWARM, ADS, Keil, WinARM, RealView, and others, making it an ideal tool for both learning and professional ARM development.
Key specifications include:
- Powered via USB (50mA current)
- Supports target board voltages from 1.2V to 3.3V, with 5V compatibility
- Can supply up to 300mA to the target board, featuring overcurrent protection
- Operating temperature: +5°C to +60°C
- Storage temperature: -20°C to +65°C
- Humidity: up to 90%
- Dimensions: 100mm x 53mm x 27mm (without cable)
- Weight: 70g (without cable)
- Complies with electromagnetic compatibility standards EN 55022 and EN 5502.
J-Link offers a variety of features that make it a top choice for developers. It supports high download speeds of up to 1 MB/s and operates at a maximum JTAG speed of 15 MHz. It automatically detects the optimal speed and monitors all JTAG signals and target board voltages. The device is fully plug-and-play, uses USB power (but does not power the target board), and comes with a USB cable and a 20-pin flat cable. It also supports multiple JTAG devices in serial connections and offers optional 14-pin JTAG connectors and 5V adapter options. Additionally, it includes a J-Link TCP/IP server, allowing remote access over a network.
**What's the difference between JTAG and J-Link?**
To debug ARM-based systems, you need to follow ARM's debug interface protocol. JTAG is one such protocol. When using development tools like IAR, Keil, or ADS, they typically use a common debugging interface called RDI. The challenge lies in converting RDI commands into the appropriate JTAG protocol.
There are two main approaches to achieve this:
1. **Software-based conversion**: This involves writing a service program on the computer that parses RDI commands from IAR, Keil, or ADS and converts them into the corresponding JTAG protocol. This conversion happens at the physical level, similar to how RS232 works. H-JTAG is an example of this approach. Its hardware is simple, just a physical level converter, while the software handles the protocol conversion.
2. **Hardware-based conversion**: This method involves building a dedicated board that receives debugging commands directly from the development environment and converts them into JTAG protocol. J-Link follows this approach. It uses a powerful CPU to handle the protocol conversion at the hardware level, resulting in faster performance, though the design is more complex.
In summary, H-JTAG relies on software for protocol conversion, making it simpler but slower, while J-Link uses hardware for faster and more efficient debugging. For developers who value speed and reliability, J-Link is the preferred choice.
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