Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
Announcements
Need Forum Guidance? Click here

Search our FPGA Knowledge Articles here.
19320 Discussions

Hi All, I have some doubt regarding FPGA I/O banks.

NKuma10
Beginner
898 Views

I'm working on FPGA with I/O banks configured as 3.3-V LVCMOS with current strength of 2ma.

I have a requirement to change the current strength to 16ma for some of the signals in this I/O bank which is not supported with 3.3-V LVCMOS. Can i change the I/O bank configuration to 3V LVCMOS? What will be impact on other signals in this I/O bank?

 

Thanks in advance

0 Kudos
4 Replies
SreekumarR_G_Intel
121 Views
Hello Andrew , Thank you giving opportunity to look at issue, Can I assume few things from your input , i) You are not plan to use LVDS in the board using FPGA. Correct ? ii) The VCCIO of bank 5 and 6 connected to the 3.3V. Also Can I assume VREFBx pin is not used for reference voltage ? Correct If my above assumption yes , I don’t think so there is issue to connect the 3.3V bank 5 and bank 6 . In the datasheet can you refer page 7 for the max apply VCCIO ? Note : VCCA must connected to the 2.5V. May I know why you think bank 5 and 6 need to use only for LVDS ? Thank you, Regards, Sree
SreekumarR_G_Intel
121 Views
Hello Naveen , I am sorry , can you please omit above answer that is not with respect to your question . Now about yours . Can I know which device you are plan to use ? it would be good if you provide part number . Thank you , Regards, Sree
NKuma10
Beginner
121 Views

Hi Sree,

 

Please find the device and the part number below.

Cyclone IV E : EP4CE55F23C8

And the I/O bank in question is BANK 3.

 

Thanks

Naveen

SreekumarR_G_Intel
121 Views

Hello Naveen ,

Apologizes for delay ,I think you can use it as long as your voltage compatibility analysis (VIL/VIH and VOL/VOH) satisfy the requirement. Also make sure trough IBIS model you are getting sufficient current strength and check the signal integrity as well.

 

Thank you ,

 

Regards,

Sree

Reply