Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

JTAG can’t find device

Hi all, I am a beginner of Altera's device. Today, When I use the JTAG mode of Quartus’ programmer to configure the device EP3C5E144, the programmer always says “Unable to scan device chain. Can...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

--- Quote Start ---

Well if your usb blaster is ok, all the connections are right and there's activity on all JTAG input signals, probably your device is broken.

Any chance you could post the schematics of your design?

-- Ton

--- Quote End ---

Dear Ton:

I have the same problem with ytggsitp when configuring the device EP3SL340H1152. the VVCCIO of

bank 1A is 2.5V.When the programmer tried to scan the chain, I test the TDI, TDO,TMS and TCK.

There is data wave on TCK ,TMS and TDI, but the TDO never change and always hold about 0 V(Why?I think the output of TDO should be at 2.5V at the begining,am I right?? ). All the power is OK.

Thank you very much!!!