JTAG is an interface that allows 1) testing of inter-chip connections 2) programming of Flash, microcontroller and FPGA devices.

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Selfbuilt USB-JTAG programmer for FPGA's [closed]

I want to program an FPGA (XILINX Spartan III), with USB port of my laptop, and I want to design the programming circuit myself (not using the XILINX's cable). So, I want to build a USB-JTAG ...
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21 views

winIDEA and iTAG Fifty

I'm currently working on connecting the iTAG Fifty with winIDEA to establish a debugging session with an ARM processor. I followed the steps described in the manual. But if I try to reset the CPU ...
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1answer
42 views

What kind of JTAG connector is this?

I have two circuit boards that are almost identical. One has a JTAG socket, and one does not. I want to add a socket to the one that doesn't have one, but I don't know which part to get. This is the ...
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2answers
126 views

Loading firmware via JTAG without soldering on headers every time?

Is there a good way to load firmware onto a PCB that has a 2x5 arrangement of JTAG headers that doesn't involve soldering on pins every time? I tried getting come pogo pins in the hopes of being able ...
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3answers
117 views

What is this socket name and where can I buy the female counterpart?

I have this socket on a PCB which is half inch wide (1.27 centimeters) with pins being close together (I think 0.05") and not uniformly spaced like in a normal IDC connector. I need to create a ribbon ...
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1answer
57 views

AVR ATmega breakpoints and BREAK instruction

I use AVR Studio 4, JTAGIce MkII-CN, gcc for debugging. It works generally OK but sometimes happens after some unspecific interruption (reset, power cycle, etc.) that AVR Studio breakpoint remains ...
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1answer
171 views

About spring loaded solderless connector for JTAG pads

The 14-pin JTAG header on a PCB, JTAG pads without holes, no other holes on PCB around JTAG connection area. Does it exist a special solderless JTAG connector for connecting JTAG cable to such JTAG ...
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2answers
45 views

Is there a way to prevent code being read from an MSP430 without blowing the fuse?

I was recently involved at a project in a small company where we had fears of someone taking the code from the master chip, an MSP430F2419, and using it for a competing product. We ended up blowing ...
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2answers
60 views

Grounding JTAG Lines

I'm working with a board design that uses a Xilinx CoolRunner II CPLD (XC2C256-7VQ100I). We're currently working with the customer, and setting up the pins they'll be using external from our board to ...
2
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1answer
359 views

What is the difference between Atmel ICE, Atmel SAM-ICE and Atmel JTAGICE mkII?

What is the difference between Atmel ICE, Atmel SAM-ICE and Atmel JTAGICE mkII? From what I understand, Atmel ICE is cheaper and better in every way, support more families, thus why would one buy the ...
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1answer
60 views

Is it possible do download a programm FROM a microprocessor? [closed]

I really don't find anything on this topic. I'm not sure if JTAG may give such possibilities. [Edit]:I found out, that for example with AVR Processors it's possible, as long as the corresponding fuse ...
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1answer
60 views

Different JTAG debug options for ATmega1281

Background: I've inherited my first ATMEL project. It's using an ATmega128A, coded in AVR Studio 4, with the Olimex AVR-JTAG-USB debugger. I've learned how to use these tools, although I'm still ...
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46 views

JTAG an LG T320 [closed]

I have this old cellphone, an LG T320. I could sell it for less than $30 (at best). (yeah it's crap, even it's touchscreen isn't very good) So under the pretense of hacking, I went on ahead and ...
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1answer
80 views

ATmega dual pin function JTAG and analog input

I need measure temperature to adjust ticks as temperature changes. I suppose thermistor nearby crystal (10ppm) as low cost solution. I'm using AT90USBxxx but I have allocated PF0-3 for more important ...
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1answer
197 views

Problem with Xilinx SDK - Failed to Scan JTAG Chain

I am having an issue with running a simple Hello World program on the Trenz TE0720-01 board with a Zync 7020 FPGA. I have been following the tutorial to setup and run the Hello World program given ...
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63 views

Beginner programming of Zynq TE0720

I am attempting to cross compile a program in c++ and put it on the ARM of the Zynq TE0720 board. I am very new to this stuff, and I have downloaded Vivado and the sdk tools. I have also looked up a ...
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1answer
90 views

In-System Programming of FPGA by MCU

Let me know if this is the wrong place for this, but I am looking to program an FPGA (Spartan 6, I believe) using a microcontroller. Right now the way I am thinking about doing this is I will load ...
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1answer
128 views

JTAG adapter without VTREF

I am designing a USB JTAG adapter using FT2232D. Most JTAG reference designs use a level translator to drive JTAG pins with VREF. I understand VREF is used because different voltage levels at target ...
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24 views

How are 1 and 0 represented by AC JTAG pulse Generator?

I am currently working with the AC-JTAG boundary scan testing where I came to know that for Ac coupled lines the AC JTAG generates pulses to represent the binary 1 or 0. However, I am little confused ...
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1answer
125 views

Powering the MCU (basic), is this circuit suitable?

Shown is a basic circuit diagram to power a MCU. I am using the recommended caps for the test circuit for the regulator. Should I put a diode between the +ve terminal of the power source and the ...
2
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1answer
62 views

More info about J-link v8

I have a J-link v8 and want to use it, but I can't find its name in Segger homepage, I want to know what ARM core it support and is it support BeagleBone or RPi.
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23 views

What is JTAG TCE signal designed for and what effect does it have on the boundary scannable IC?

I know for fact that some boundary scannable ICs don't have this JTAG TCE input signal but some does. Does any one know why?
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1answer
71 views

JTAG/SWD Data Logging

I would like to automatically poll and log certain memory locations on the STM32 I'm working with through the j-link debugger I am using to debug the system. Is this possible through the JTAG or SWD ...
0
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1answer
113 views

problems using atmega644pv jtag pins as gpio [closed]

I've been trying to use port C pins on an atmega644pv as gpio, and have been running into some trouble. as far as i can discern, it seems like the middle four pins (PORTC 2,3,4,5) are stuck in a high ...
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48 views

JTAG Bus Length

Could anyone tell me if JTAG requires to have the same bus(wire) length for TDI, TDO, TMS, and TCK?
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85 views

Atmel Studio JTAG Debugger Behaviour

The qeustion: I would like to know what is different about the way JTAG treats the "step over" and "step into" commands. Background: I am trying to set a GPNVM bit on a SAM3N (ARM Cortex M3) chip ...
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1answer
135 views

Silicon Labs USB Debug Adapter and other MCUs

Recently a friend donated a Silicon Labs C8051F devkit to me. It has this USB Debug Adapter. For me this device looks like a JTAG adapter or I'm wrong? Is it possible to debug other MCUs like ARM ...
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1answer
348 views

What is the difference between JTAG and EJTAG?

I want to know what is the difference between JTAG and EJTAG? I know about JTAG as it's a hardware tool used to examine the memory and registers. Correct me if I'm wrong.
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85 views

Embedded Pi JTAG program cable

I bought an Embedded Pi as an add-on for my Raspi. Seems that I should have also bought the ColinkEx programming cable too. I happen to have a Northmicro Blaster JTAG cable from when I was working on ...
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1answer
48 views

Connecting Atmel AVRISP to JTAGICE header

I have an AVR board with 10-pin JTAGICE header and a 6-pin ISP. Can I somehow connect the ISP to program this board without having JTAG functionality?
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0answers
122 views

OpenOCD w/ ARM-USB-OCD-H+ARM_JTAG_SWD

Has anyone been able to debug/program using SWD over a Olimex USB-JTAG programmer and the ARM-JTAG-SWD adapter? If so, please share how you did it :) Specifically, I'm looking for what the OpenOCD ...
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1answer
672 views

DIY AVR JTAG programmer using AVR

I have an AVR Dragon and several AVR MCUs. I recently purchased a BeagleBone Black (Cortex-A8). I'm trying to write my own bootloader. However, this would require a programmer. Can I use an AVR MCU ...
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1answer
94 views

Embedded software app testing

The software app being developed runs on the embedded hardware and spits the debug output through a serial port during various functionality of the app. Following are the questions. Can I use the ...
2
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1answer
81 views

Difference between Test mode and Functional mode in JTAG

Hi while reading the datasheet for an ethernet controller chip, I came across the terms functional mode and test mode in relation to JTAG. Can someone kindly explain these terms.
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112 views

Why no JTAG connection?

This used to work before I installed Quartus v10 to ensure backward-compatibility. Now I get no hardware found in Quartus both v13 and v10. The USB-Blaster used to show up, then I installed Quartus ...
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3answers
1k views

Laying out a 10-pin JTAG/SWD connector on a final design

I'm designing a board with an ARM microcontroller on it (LPC1347FBD48) and I want to include a 10 pin jtag/swd connector, as is standard, for in-circuit debugging of my final design. Here is the ...
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1answer
117 views

openOCD : how do I know if my LPT-JTAG adapter is in sync?

My openocd config file has the following content ...
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1answer
438 views

openOCD flash 'erase_sector' command NOT erasing lpc1768?

I am trying to debug LPC1768 using a JTAG debugger and openOCD(version 0.7.0). My os is Win7 . I'm connetced to the openOCD via telnet(port 4444) commands like halt, flash info, resume etc do work ...
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202 views

What do these OpenOCD CPU states mean?

Here is what the documentation has to say: ...
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1answer
190 views

Strange error when connecting JTAG

My setup: Common) CPU: at91sam7x512, JTAG: olimex-arm-usb-tiny-h, proprietary single-CPY board 1) Windows 7, OpenOCD 0.0.4 <- works 2) Ubuntu 13.04, OpenOCD 0.7.0 <- strange error There ...
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1answer
80 views

What is In-circuit debugger and In system programmer

On many boards I have found that there is a circuitry called In-circuit debugger and In system programmer. What are these and how they are related to JTAG? I understand JTAG is also a kind of hardware ...
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1answer
100 views

what is JTAG and its real time applications [closed]

what is JTAG , how it differ from ISP, ICD .It will really helpful for me if someone explains with real time examples .
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1answer
225 views

Running JTAG chain over busy backplane

We are busy designing a large system with around four PCBs slotting into a backplane. Each PCB could contain a DSP as well as a large FPGA. We would like to run 2 JTAG chains through the system, one ...
3
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2answers
233 views

What is an MCU program trace?

I have read in a few places about Atmel's support of program traces on their high-end debugger/MCUs. It seems to be that some of the AVR32 processors can be 'traced' by the AVROne! ...
2
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1answer
270 views

JTAG Design for altera cyclone 3

I am designing the JTAG for a Altera Cyclone 3 (EP3C5E144C8N). I was only aiming at normal JTAG, and do not need Active Serial. I have attached the schematic and board in the *.zip file ...
3
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2answers
272 views

Developing for TI's CC430F5137 MCU

I'm developing an embedded systems project (I'm quite new to the area) and I have determined that I want to use the CC430F5137, my problem is: How can I develop for it? From cross-compilation, to ...
2
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1answer
100 views

Program speed with and without JTAG debugger

I have some custom boards with an ARM processor (marvell78100, armv5 compliant), some SDRAM and some Flash. I'm trying to investigate timings problem with the SDRAM, since it seems the layout was not ...
2
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1answer
83 views

Connecting with only JTAG

I've been wanting try out new microcontrollers and microprocessors other than the very mainstream Arduino and similar. So I want to start by making a inexpensive test board with a minimal test of ...
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1k views

Consensus on proper wiring for Cortex M 10 Pin JTAG Connector

For the past few weeks I have been working with the new revision of my ARM Cortex M4 design that I posted about a month ago, thanks again to everyone who provided me with much needed guidance and ...
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1answer
353 views

Segger J-Link GDB-Server / STM32100B-EVAL / Debugging hangs at first instruction

I'm using a J-Link and the corresponding Linux GDB-Server from Segger. When I start debugging with Eclipse the program is automatically halted at the first instruction in the startup assembler code. ...