MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ
Username:
 Password:
Save Password
Forgot your Password?

 All Forums
 MCUmall Forums
 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 Jtag		  New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

macgyver655

14 Posts
Posted - 11/21/2009 :  21:24:53  Show Profile  Reply with Quote
With a GQ-4X and jtag adapter, would I be able to jtag and read the embedded logic of a PLD?
Reply #1

ZLM

2945 Posts
Posted - 11/23/2009 :  08:36:07  Show Profile  Reply with Quote
Yes. As long as you have a JTAG port on your PLD target board.
Go to Top of Page
Reply #2

macgyver655

14 Posts
Posted - 11/23/2009 :  09:51:29  Show Profile  Reply with Quote
Yes. I have identified the JTAG pins on the chip. They are just floating so I will have to connect direct.

I should also be able to use pwr and gnd from the JTAG adapter to power the chip for the read, Correct?

Using the correct voltage of course.
Go to Top of Page
Reply #3

ZLM

2945 Posts
Posted - 11/23/2009 :  10:09:36  Show Profile  Reply with Quote
Yes.
Power the chip from your target board only.

Only connect signal and ground pin to programmer.
Go to Top of Page
Reply #4

macgyver655

14 Posts
Posted - 11/23/2009 :  10:28:25  Show Profile  Reply with Quote
Wait. Your answer is not clear. I plan on using this JTAG adapter.

http://www.mcumall.com/comersus/store/comersus_viewItem.asp?idProduct=4310

So your saying DONT use power from this adapter to power the chip?
Go to Top of Page
Reply #5

ZLM

2945 Posts
Posted - 11/23/2009 :  10:38:05  Show Profile  Reply with Quote
It is better not to power the chip from the programmer. That because the programmer only can provide limited power source. We do not know how much power is needed to power your target board.

There is a power selection jumper on the adapter, you can try both way.
Go to Top of Page
Reply #6

macgyver655

14 Posts
Posted - 11/23/2009 :  11:04:24  Show Profile  Reply with Quote
Ok. Great. Thanks

One last question. On the chip I have there are 2 pins with different names then usual. Can you identify? I have TCK, TDI, TDO, TENA1 and VST. I was assuming the TENA1 is TMS. TENA meaning test enable? What do you think?
Go to Top of Page
Reply #7

ZLM

2945 Posts
Posted - 11/23/2009 :  11:22:15  Show Profile  Reply with Quote
Not sure what those pins are. Check the chip datasheet.
Go to Top of Page
Reply #8

macgyver655

14 Posts
Posted - 11/23/2009 :  11:41:12  Show Profile  Reply with Quote
That is from the very, very limited datasheet I have.

They are all marked test pins and in their own group. On the target board, VST is tied to gnd.

This is an older chip (1997) and not available anywhere and no other info available which is why I'm trying to get a read on the logic. I have nothing to loose.
Go to Top of Page
Reply #9

macgyver655

14 Posts
Posted - 11/23/2009 :  11:44:30  Show Profile  Reply with Quote
I'm thinking VST to mean VSS(Gnd) test.

Then thinking tena to mean test enable for TMS: test mode select.
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
MCUmall EPROM BIOS Chip Burner Forum © Copyright 2003 - 2009 Mcumall Electronics Inc. Go To Top Of Page
Generated in 0.09 sec. Snitz Forums 2000