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Bus Blaster v4 is an experimental, high-speed JTAG debugger from Dangerous Prototypes.

Thanks to a reprogrammable buffer, a simple update over USB makes Bus Blaster compatible with many different JTAG debugger types in the most popular open source software.

Based on FT2232H with high-speed USB 2.0
Buffered interface works with 3.3volt to 1.8volt targets
Reprogrammable buffer is compatible with multiple debugger types
Compatible with 'jtagkey', 'KT-link' programmer settings in OpenOCD, urJTAG, and more
ships with JTAGkey compatible buffer image pre-programmed
Should support Serial Wire Debug when available
Mini-CPLD development board: self programmable, extra CPLD pins to header
Open source (CC-BY-SA)

Bus Blaster Manual
Bus Blaster design overview
Bus Blaster forum
CPLD buffer logic overview
V4 uses a larger CPLD than previous versions. It can now support the SWV feature of Cortex microcontroller for advance debugging when software support is available
SWV is little used and not currently supported in software, most users will be better off with Bus Blaster v3 available here
Fitted in a DP9056 (90×56 mm) standard PCB
Added series resistors to input and output pins to protect against damage and noise

Updates in v4:

Each unit is tested before it ships.

This open source hardware and software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Techsupport

This product is designed by Dangerous, If you encounter any problems when using this product, please request technical support in the forum.