Forum Discussion

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

Input pins are driven down

Hello, I wish everyone have happy new year. In my case, it's not. I have connected input pins of CPLD(MAX II, EPM570C5N) and CMOS image sensor output pins. But, there are a problem with the...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

--- Quote Start ---

The programming mode is JTAG, and Quartus II version is 10.0.

My USB-Blaster is from terasic.

--- Quote End ---

Hi,

are you sure that the programming is succesful ? Have a look into the <project_name>.pin file and double check your pin assignments.

Quartus has a default setting for unused pins, which is "Output driven ground". You should change the setting to " As tri-stated input with weak-pull up" and run a new compilation.

You can change the setting by:

Assignments -> Device -> Device and pin options -> unused pins

Kind regards

GPK