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Cyclone 4 JTAG programming issue

Altera_Forum
Honored Contributor II
‎11-11-2015 12:52 PM
1,056 Views

Recently, we faced the following problem during the JTAG programming for the chip EP4CE40F23. The chip suddenly was not recognized by the cable. At startup, the FPGA loads from the EPCS. The older EPCS jic file works fine. We wanted to change the code stored on the EPCS flash by the JTAG like we always did. 

 

We noticed that the TDI pin voltage is not good. The JTAG debugging says that this pin may be shorted to gnd. We see small resistance value from this pin to the gnd using the Ohmeter.  

Using the oscilloscope, we noticed that the voltage on this does not raise up to 2.5V like other working boards. 

 

Thanks
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Altera_Forum
Honored Contributor II
‎11-12-2015 01:16 AM
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Perhaps you might want to check with your local FAE to see if your chip is still under warranty? Just click on contact us at Altera website

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