Jlink V9 Schematic ((exclusive))
Overview of J-Link V9
The J-Link V9 is a USB-based debugger and programmer that supports a wide range of microcontrollers, including ARM-based devices, Cortex-M, and others. It is designed to work with various development environments, such as Keil, IAR Systems, and SEGGER's own Embedded Studio.
Key Features of J-Link V9
- Supports a wide range of microcontrollers, including ARM-based devices and Cortex-M
- High-speed USB 2.0 interface for fast data transfer
- Supports JTAG, SWD, and SWV interfaces for debugging and tracing
- Voltage range: 1.8V to 3.3V
- Current consumption: <100mA
J-Link V9 Schematic
The J-Link V9 schematic is based on a combination of components, including:
- Microcontroller: The J-Link V9 uses a USB microcontroller, such as the Atmel SAM3X8E or equivalent, to manage the USB interface and handle communication with the host PC.
- FPGA: A Field-Programmable Gate Array (FPGA), such as the Xilinx Spartan-6 or equivalent, is used to implement the JTAG, SWD, and SWV interfaces, as well as other logic functions.
- Voltage Regulators: The J-Link V9 uses voltage regulators, such as the Texas Instruments TPS63050 or equivalent, to provide stable voltage outputs for the various components.
J-Link V9 Pinout
The J-Link V9 has a 10-pin or 20-pin connector that provides access to the JTAG, SWD, and SWV interfaces. The pinout is as follows:
- 10-pin connector:
- Pin 1: VCC (3.3V)
- Pin 2: GND
- Pin 3: TCK (JTAG clock)
- Pin 4: TMS (JTAG mode select)
- Pin 5: TDI (JTAG data in)
- Pin 6: TDO (JTAG data out)
- Pin 7: SWCLK (SWD clock)
- Pin 8: SWDIO (SWD data)
- Pin 9: SWO (SWD output)
- Pin 10: GND
- 20-pin connector:
- Pin 1: VCC (3.3V)
- Pin 2: GND
- Pin 3: TCK (JTAG clock)
- Pin 4: TMS (JTAG mode select)
- Pin 5: TDI (JTAG data in)
- Pin 6: TDO (JTAG data out)
- Pin 7: SWCLK (SWD clock)
- Pin 8: SWDIO (SWD data)
- Pin 9: SWO (SWD output)
- Pin 10: TRST (JTAG reset)
- Pin 11: RTCK (JTAG return clock)
- Pin 12: GND
- Pin 13: VCC (3.3V)
- Pin 14: Key (not connected)
- Pin 15: Key (not connected)
- Pin 16: Key (not connected)
- Pin 17: Key (not connected)
- Pin 18: Key (not connected)
- Pin 19: Key (not connected)
- Pin 20: GND
Design Considerations
When designing a board that interfaces with the J-Link V9, consider the following: jlink v9 schematic
- Voltage levels: Ensure that the voltage levels on the J-Link V9 interface match the voltage levels on your board.
- Signal integrity: Ensure that the signal integrity of the JTAG, SWD, and SWV signals is maintained, using techniques such as signal buffering and termination.
- Power supply: Ensure that the power supply to the J-Link V9 is adequate and meets the required voltage and current specifications.
Software Support
The J-Link V9 is supported by various software tools, including:
- SEGGER's J-Link software: This software provides a comprehensive set of tools for debugging and programming microcontrollers using the J-Link V9.
- Keil µVision: This is a popular integrated development environment (IDE) that supports the J-Link V9 for debugging and programming.
- IAR Systems' IAR Embedded Workbench: This is another popular IDE that supports the J-Link V9 for debugging and programming.
Conclusion
The J-Link V9 is a powerful debugging and programming tool for microcontrollers. By understanding the J-Link V9 schematic, designers and developers can create boards that interface seamlessly with the J-Link V9, enabling efficient debugging and programming of their microcontrollers.
is a widely used legacy debug probe from known for its high performance in programming and debugging ARM-based microcontrollers. While official schematics for these devices are proprietary, detailed community-driven schematics and "mini" versions are available for repair or DIY purposes. Key Hardware Features
The V9 represented a significant upgrade over previous versions (like V8) by introducing a more powerful processor and faster interface capabilities: : Features an
(Dual-core ARM Cortex-M4/M0) or similar high-performance MCU, which handles the complex JTAG/SWD timing and USB communication. USB Interface : Supports USB 2.0 High-Speed
(480 Mbps) in later revisions, though some early V9 units were limited to Full-Speed. Target Voltage Support : Typically operates across a range of 1.2V to 5V Overview of J-Link V9 The J-Link V9 is
, making it compatible with most modern low-power microcontrollers. Debug Speeds : Supports JTAG/SWD speeds up to (some sources suggest even higher for specific models). Schematic Breakdown Community schematics, such as those found on , generally include the following sections: Power Regulation : Linear regulators (like AMS1117-3.3
) to convert USB 5V to the 3.3V required by the internal MCU. Protection Circuitry : Level shifters or buffers (often
series) to protect the internal MCU from voltage spikes or mismatches on the target side. Interface Port : A standard 20-pin IDC connector
(0.1" pitch) providing access to JTAG, SWD, and SWO (Serial Wire Output) signals. Status Indicators
: LED circuits to indicate power, connection status, and active debugging activity. Common Technical Issues Firmware Loss
: Some V9 units (particularly clones or early versions) can suffer from corrupted flash memory, requiring a re-flash using a separate programmer like an Schematic Errors
: DIY schematic versions occasionally have known bugs, such as incorrect pin mappings (e.g., PB8 accidentally connected to PB9), which require manual verification during PCB design. uglyduck.vajn.icu or a specific pinout guide for the 20-pin connector? J-Link BASE V9 - SEGGER Knowledge Base
You're looking for information on the J-Link V9 schematic. Unfortunately, I don't have direct access to proprietary or specific hardware schematics, including the J-Link V9, as they are typically reserved for internal use or shared under specific agreements. J-Link V9 Schematic The J-Link V9 schematic is
However, I can guide you on where you might find more information or how you could approach putting together a piece related to the J-Link V9 or similar devices.
The FPGA Question
There is a long-standing debate in the community: Does the J-Link V9 use an FPGA?
Looking at the PCB layouts and "leaked" reference schematics:
- Standard J-Link V9: Usually relies entirely on the high-speed MCU (LPC43xx) to handle JTAG state machines in software/hardware mix. The GPIO switching speed of the LPC4300 is fast enough to handle JTAG clocks well above 50MHz without a dedicated FPGA.
- J-Link Ultra+ / Pro: These models likely incorporate a small FPGA or CPLD to offload the bit-banging from the main CPU to achieve even higher sustained transfer rates, though this is rarely visible on standard V9 schematics.
2. Voltage Level Shifters
The target microcontroller might run at 5V, 3.3V, or 1.8V. The J-Link V9 uses a combination of dual-supply bus transceivers (like the 74LVC2T45 or TXB0108) to bi-directionally shift logic levels without distorting the SWD clock (SWCLK) and data (SWDIO) signals.
1. The Main MCU: LPC4322 (or LPC4330)
Unlike the V8 which used an Atmel AT91SAM7S, the V9 upgraded to an NXP LPC4322 (ARM Cortex-M4 with an M0 co-processor). This chip was chosen for its high-speed USB 2.0 High Speed (480 Mbps) capability and its massive internal RAM.
- Voltage: 3.3V core, 5V tolerant I/O.
- Key features: 264 kB SRAM, 1 MB Flash (on some variants), and a unique Serial Wire Debug (SWD) interface.
Legal and Ethical Considerations
You will notice that no actual PNG or PDF of the J-Link V9 schematic is included in this article. Why? Because distributing it violates:
- Segger’s intellectual property (copyright on PCB layout).
- The DMCA anti-circumvention provisions (if the schematic is derived from decapped chip analysis).
Several GitHub repositories hosting J-Link V9 schematics have received DMCA takedown notices. Segger actively prosecutes resellers of cloned hardware in Germany and China.
For hobbyists: Building one clone for personal education is legally gray but practically ignored. Selling 1,000 units will result in a lawsuit.
