Bus Blaster v4 (http://www.seeedstudio.com/depot/bus-blaster-v4-p-1416.html) is a redesign of v3/v2

that supports SWV, an obscure extension to a reduced pincount JTAG protocol most people will never

use. Unless you need it, stick with v3 and save a few bucks!

◾ 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 v4 available here (http://www.seeedstudio.com/depot/bus-blaster-v3-p-1415.html?

cPath=63_69)

◾ Fitted in a DP9056 (90x56 mm) standard PCB

◾ Added series resistors to input and output pins to protect against damage and noise

Each unit is tested with a real JTAG target before it ships.

Read about the design below.

Contents

◾ 1 Overview

◾ 2 Parts Layout Guide

◾ 3 Hardware

◾ 3.1 FT2232H

◾ 3.2 Buffered interface

◾ 3.2.1 Reprogramming logic

◾ 3.2.2 CPLD

◾ 3.3 Buffer logic

◾ 3.3.1 JTAGkey compatible

◾ 3.3.2 KT-link compatible

◾ 3.4 Pinout

◾ 4 PCB

◾ 4.1 Partslist

◾ 5 Taking it further

◾ 6 Get one!

◾ 7 Links

◾ 8 License

Overview

The Bus Blaster is used to program and debug

devices with a JTAG interface like ARM

processors, CPLDs, flash memory, and more. A

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