2006-07-05 18:11:04     About JTAG solutions

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2006-07-05 18:11:04     About JTAG solutions

Engin AYDOGAN (UNITED STATES)

Message: 10236    Hello,

 

There are three JTAG solutions whom cost varies from 25$ to 300$. Any of them has advantages over the other ? Could someone shed some light on what could be JTAG used for and what not ?

 

From what I know it's main purpose is debugging.

 

Can I use the JTAG for:

 

1) Download programs to the board faster (than serial cable 5kb/sec)

2) Terminal communication so I can spare the serial port for touchpad. (BF533 EZKIT-LITE has one serial port)

 

From the manual of the 300$ JTAG solution it says it can transfer files at ~150kb/sec. And also it's highligting software products which has great debugging capabilities + register/memory read/write which might be quite usefull. But I guess those products will work the same way with the other JTAG solutions, right ?

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2006-07-06 02:03:42     RE: About JTAG solutions

Jerry Zeng (CHINA)

Message: 10254    Hi Engin,

 

> 1) Download programs to the board faster (than serial cable 5kb/sec)

 

Maybe or not. I tried IGLOO, and it is slower than serial. I don't know the download speed of another two.

 

>2) Terminal communication so I can spare the serial port for touchpad. (BF533 EZKIT-LITE has one serial port)

 

No, It cannot ne used for that purpose.

 

We maily use IGLOO, so I cannot give a comparation between them.

 

 

-Jerry

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2006-07-07 10:26:48     RE: About JTAG solutions

Viet Hoang (VIET NAM)

Message: 10343    Hi all,

I want to buy an JTAG cable for my BF537 STAMP board. I found this link:

http://www.excelpoint.com/news04.html

Is this right? Any one could confirm for me?

Thanks.

Viet.

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2006-07-07 11:54:01     RE: About JTAG solutions

Jie Zhang (UNITED STATES)

Message: 10346    Yes.

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2006-07-10 06:41:42     RE: About JTAG solutions

Star Bravo (SINGAPORE)

Message: 10416    How this JTAG is different from HPUSB-ICE JTAG Emulator from ADI (which is VERY expensive).

 

Can this JTAG do everything what ADI HPUSB-ICE can? Should be ...

 

Why so much price difference?

 

- Bravo

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2006-07-10 08:37:13     RE: About JTAG solutions

Jerry Zeng (CHINA)

Message: 10421    Hi Star,

 

IGLOO is mainly supported by ucLinux.

HPUSB-ICE JTAG is mainly supported by VDSP.

 

 

-Jerry

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2006-07-10 16:15:32     RE: About JTAG solutions

Wojtek Skulski (UNITED STATES)

Message: 10444    Engin:

 

You asked whether you could use the JTAG for:

 

1) Download programs to the board faster (than serial cable 5kb/sec)

2) Terminal communication so I can spare the serial port for touchpad. (BF533 EZKIT-LITE has one serial port)

 

Have a look at BlackStamp CPLD solution, in particular the text about the SPI flash programming. Then think of combining the power of the Xilinx CPLD with Blackfin. I am using the CPLD for SPI flash programming because it was my goal, but you can use it for something else if you are fluent with VHDL. I suspect there is nothing that would prevent you from using this CPLD as a memory-mapped UART.

 

Of course I should qualify my answer with the kind of JTAG we are talking about. Both the Blackfin and the CPLD have their own JTAG ports. I am talking of the CPLD JTAG here, which is different from the ADI JTAG. My understanding is that ADI JTAG is meant for talking to the Blackfin and nothing else. If you really know what you are doing, you can connect chips from different vendors in one JTAG chain. Then you need to deal with BSDL files and what not. I would not advise going this way.

 

To summarize, if you want to have a very powerful general purpose IO port which doubles as a Xilinx JTAG port, then look at what I did. But if you want to use the ADI JTAG port, then its general-purpose use may be possible, but I would not bet on it.

 

Hope it helps -- W.

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2006-07-11 01:25:45     RE: About JTAG solutions

Jerry Zeng (CHINA)

Message: 10465    Hi Engin/Wojtek,

 

I think JTAG solution can be viewed as three parts: Hardware interface, Adaptor, and Software. JTAG standard (IEEE 1149.1) designates the same four signals (and the fifth is optional) for test purpose. But it seems no designation of the order of these signals. Sometimes you shold also support power supply for JTAG hardware interface. The software is related with the target to be tested. Since JTAG only standardize the means of testing and some public instructions, not standardize the testing content, as well some private instructions.

 

For eample, STAMP-537 has onboard CPLD and Blackfin, both has JTAG interface. But they have different signal order, so IGLOO has two adaptors, one for Blackfin, one for CPLD.

 

-Jerry

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2006-07-11 04:25:43     RE: About JTAG solutions

Engin AYDOGAN (UNITED STATES)

Message: 10478    Wojtek,

 

Yes I'm aware that you've used CPLD with your design. And, as a matter of fact, we already had the Xilinx CPLD starter kit and one of our engineer is working on it, figuring out VHDL etc.

He knows about your design and I'm sure he's using it as reference. Thanks for the advices.

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2008-09-04 16:11:21     RE: About JTAG solutions

Ed Sutter (UNITED STATES)

Message: 61636   

 

Is the JTAG Blue download cable available anywhere?  I went to the Renaelectronics website, they have something that looks identical for Xilinx, but they don't seem to have the JTAG Blue cable.  I sent them a query, but figured I'd ask here also.  Anyone know?

 

Thanks

 

Ed

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2008-09-04 16:29:45     RE: About JTAG solutions

Mike Frysinger (UNITED STATES)

Message: 61638   

 

best to ask them ... we really dont pay attention to any parallel port solutions

 

why not just get a USB gnICE instead ?

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2008-09-04 16:36:25     RE: About JTAG solutions

Ed Sutter (UNITED STATES)

Message: 61639   

 

In the nutshell... about $275.00 !  :-)

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2008-09-04 16:42:23     RE: About JTAG solutions

Ed Sutter (UNITED STATES)

Message: 61640   

 

Wait, my mistake, the ICEBear is $300.00.  This one looks like its about $80.00 (US).  I missed that one.  I assume this is compatible with the JTAG tools you guys support right?

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2008-09-04 16:58:51     RE: About JTAG solutions

Mike Frysinger (UNITED STATES)

Message: 61641   

 

right, the gnICE is cheap ... it should be supported by us seeing as how we designed it

 

we use Bluetechnix as the board house so we dont have to build/stock it ... if $80 is too much, the full schematics and such are online if you want to make it yourself

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2008-09-05 08:19:52     RE: About JTAG solutions

Ed Sutter (UNITED STATES)

Message: 61700   

 

Ok, thanks...

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