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

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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
54 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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20 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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63 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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26 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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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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106 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 ...
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49 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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22 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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45 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 ...
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78 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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42 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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55 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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95 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
193 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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60 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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36 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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94 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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479 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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84 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 ...
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66 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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84 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
726 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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83 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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292 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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161 views

What do these OpenOCD CPU states mean?

Here is what the documentation has to say: ...
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153 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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71 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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94 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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217 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 ...
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2answers
187 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! ...
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1answer
218 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 ...
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231 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 ...
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60 views

Troubles sharing GPIO and JTAG on MC56F8006

This is my first time with freescale (DSC MC56F8006) and I am having some troubles related to GPIOD3 and GPIOD0 configured as digital output/input respectively shared with the JTAG. When I try to ...
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88 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 ...
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80 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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784 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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296 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. ...
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163 views

Best JTAG adapter for ARM Cortex A8?

I am bringing up a new board soon based on TI's AM335x cortex A8 CPU. Development environment is Ubuntu 12.04 running in a VM. Can anyone suggest a good reliable JTAG adapter what will work with ...
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213 views

JTAG Programming with LPC4330

Because the Example Virtual Serial Device project from NXPUSBLib contains a space in it's directory structure (specifically Example_VirtualSerialDevice/LPC43xx M4/...) I can not successfully download ...
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301 views

Readying a New Design, would appreciate som feedback

I designed a Arduino shield compatible board around the NXP LPC4337JBD144. so far I have been unable to get the first revision to program. In the first design the JTAG header was not setup ...
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244 views

TI MSP430 JTAG Interface

I am working on interfacing a JTAG interface to a MSP430BT5190. Below is a showing of how it should be connected. Looking at the pin out of the JTAG, I see there is a TDO and TDI. When connecting ...
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2answers
320 views

What are the typical uses for a non-inverting quad buffer IC?

Do excuse my lack of knowledge on the subject, but on the Opendous JTAG schematic there are two 74LCX125 IC's. The datasheet refers to them as Low Voltage Quad Buffers, but I don't fully understand ...
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409 views

Is the FT232H a single channel version of the FT2232H?

I'm looking at the Opendous JTAG Project, and would like to integrate a this JTAG debugger circuit on my ARM Cortex M3 experiment board I'm designing. I noticed that Channel B, on the FT2232H chip is ...
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259 views

What's the difference between the ST-LINK/V2 and STX-RLINK programmers? [closed]

Do both support full on debugging with the ability to set breakpoints etc? ST-LINK/V2 STX-RLINK
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3answers
961 views

Is there an open source USB to JTAG circuit I can include in my PCB design?

Im trying to find out if it would be possible to build/include a USB to JTAG circuit on my experiment circuit board I'm designing. My aim is not to reinvent the wheel, but use something that is ...
3
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2answers
347 views

Where does JTAGSEL connect to on a JTAG header?

I'm busy working on a PCB design for an Atmel SAM3S ARM chip. The following image is a screenshot of the JTAG 20 pin header schematic: On the CPU, there's a pin for JTAGSEL, and looking through the ...
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345 views

Low priced universal USB ARM JTAG that works with a broad range of devices and SDK's?

Can someone recommend a reliable USB JTAG programmer/debugger for ARM processors, mostly Cortex-M3/M4, from a variety of manufactures like ST, TI, Atmel, and NXP, that will work with Keil, IAR, etc. ...
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684 views

Wifi Module over UART with STM32 mcu

I am trying to integrate an off the shelf wifi module with STM32f2 mcu over UART interface. I need to test the board after laying out the board. Is there a way I can test this UART interface before ...
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166 views

JTAG basic question

I'm trying to understand how a JTAG connector looks. To successfully interface with a board, are there any alternatives to JTAG? Will all the pins of the JTAG be clumped together, or can they be ...