Forum Discussion
ContributorHow does Quartus know what is voltage on each FPGA I/O bank?
It is possible to connect different voltages to each bank of an FPGA. The I/O standard of the pins on the FPGA relies on what bank voltage has been connected to it.
Now my questions are:
1. How does Quartus know what voltage is connected to the banks?
2. If Quartus does not know the voltage on the banks, how does it know what I/O standard can be applied on the I/O pins?
3. What constraints exist on what voltage can be supplied to the banks in an FPGA?
I am using a MAX10 10M50DAF device. However, a general purpose answer is preferred on this website.
To New Contributor I,
In the Pin Planner you specify what voltage goes to each I/O bank. This is done on a pin-by-pin basis. It will give you a (compilation) error if you specify pins with two different voltages on the same bank. It's up to you to connect the correct voltage to each I/O bank on your circuit board.
10 Replies
AminT_IntelRegular Contributor
Hello,
Thank you for using out Intel® FPGA. That can all be done by using tools in Intel® Quartus®. Everything is done manually where you decide the I/O Standard of your design and then there will be a value(s) of voltage that is allowed on that particular I/O Standard that you have set.
You can refer to document from this link on page 9: https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/max-10/ug_m10_gpio.pdf
Like example from the table on page 9: If you pick 3.3V LVCMOS you are allowed to put 3.3V/3.0V/2.5V for Vccio input and 3.3V output. There is no guarantee that you device will be okay if you set beyond the recommended voltage from the document above.
I hope this answer helps.
Thank you.
gyuunyuuPlease check the attached image. It shows the available options for the pin I/O standards. The options are all over the place.
If Quartus knew that my I/O bank was lets say at 3.3V, it won't show me all those 1.0V and 2.5V options in the drop down menu. Do you understand my question now?
sstrellSuper Contributor
If you select an invalid I/O standard voltage for your device, you'll get an error during compilation.
