MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
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T O P I C    R E V I E W
macgyver655 Posted - 11/21/2009 : 21:24:53
With a GQ-4X and jtag adapter, would I be able to jtag and read the embedded logic of a PLD?
9   L A T E S T    R E P L I E S    (Newest First)
macgyver655 Posted - 11/23/2009 : 11:44:30
I'm thinking VST to mean VSS(Gnd) test.

Then thinking tena to mean test enable for TMS: test mode select.
macgyver655 Posted - 11/23/2009 : 11:41:12
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.
ZLM Posted - 11/23/2009 : 11:22:15
Not sure what those pins are. Check the chip datasheet.
macgyver655 Posted - 11/23/2009 : 11:04:24
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?
ZLM Posted - 11/23/2009 : 10:38:05
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.
macgyver655 Posted - 11/23/2009 : 10:28:25
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?
ZLM Posted - 11/23/2009 : 10:09:36
Yes.
Power the chip from your target board only.

Only connect signal and ground pin to programmer.
macgyver655 Posted - 11/23/2009 : 09:51:29
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.
ZLM Posted - 11/23/2009 : 08:36:07
Yes. As long as you have a JTAG port on your PLD target board.

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