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MAX II TDO Problem

Altera_Forum
Honored Contributor II
‎04-19-2009 01:21 PM
1,134 Views

Hello! 

 

I use EPM2210GF256. It seems, like it's TDO signal is constantly in high- Z. Of course, i cannot connect to the device with JTAG. 

 

I can see voltage around 300-400 mV on the TDO net and nothing helps. I have 1.2k pull down resistor on the TCK and 8.2k pull up on TMS. 

 

Please, help :) 

 

Thank you in advance!
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Altera_Forum
Honored Contributor II
‎04-19-2009 02:47 PM
445 Views

Oh, i know what was that. 

 

The device's grounds were disconnected from board's common GND plane. 

 

Thanks anyway!
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