DE0-NANO Pin Out Voltage Warning

[Altera_Forum]

Hallo 

 I am using DE0-NANO board for my project and i get the following warning from the pin out voltage. I am using 3.3 V LVTTL for all the pins and 8 mA  I am attaching my pin out file.   Warning (169177): 6 pins must meet Altera requirements for 3.3-, 3.0-, and 2.5-V interfaces.  Info (169178): Pin clk_enable uses I/O standard 3.3-V LVTTL at N9  Info (169178): Pin clk uses I/O standard 3.3-V LVTTL at R8  Info (169178): Pin reset uses I/O standard 3.3-V LVTTL at E1  Info (169178): Pin BCLK uses I/O standard 3.3-V LVTTL at B7  Info (169178): Pin WS uses I/O standard 3.3-V LVTTL at A7  Info (169178): Pin Input uses I/O standard 3.3-V LVTTL at C8    This warning doesn't have any effect on the complitation, i am just concerned if it has any effect on the hardware i am connecting to. The input coming from my external hardware to development board GPIO pins are 3.3 V LVTTL

[Altera_Forum]

Hi Shauk, 

   --- Quote Start ---   i am just concerned if it has any effect on the hardware i am connecting to. The input coming from my external hardware to development board GPIO pins are 3.3 V LVTTL  --- Quote End ---   1. Check the drive strength, That is your Voh>vih min & Vol< vil max and current requirement (Assuming your FPGA pins are output and hardware connecting are input) 2. And also the trace capacitance, Voltages may vary at higher frequency please check max load driving capability of output pins. If this has been taken care there will be no issues.   --- Quote Start ---  Warning (169177): 6 pins must meet Altera requirements for 3.3-, 3.0-, and 2.5-V interfaces. Info (169178): Pin clk_enable uses I/O standard 3.3-V LVTTL at N9  --- Quote End ---   1.This warning is automatically generated when we use voltage levels 2.5 & 3.3V.  For more information check below link http://www.altera.com/literature/an/an447.pdf (http://www.altera.com/literature/an/an447.pdf)  Best Regards, Anand Raj Shankar (This message was posted on behalf of Intel Corporation) 

[Altera_Forum]

--- Quote Start ---  Hallo  I am using DE0-NANO board for my project and i get the following warning from the pin out voltage. I am using 3.3 V LVTTL for all the pins and 8 mA  I am attaching my pin out file.   Warning (169177): 6 pins must meet Altera requirements for 3.3-, 3.0-, and 2.5-V interfaces.  Info (169178): Pin clk_enable uses I/O standard 3.3-V LVTTL at N9  Info (169178): Pin clk uses I/O standard 3.3-V LVTTL at R8  Info (169178): Pin reset uses I/O standard 3.3-V LVTTL at E1  Info (169178): Pin BCLK uses I/O standard 3.3-V LVTTL at B7  Info (169178): Pin WS uses I/O standard 3.3-V LVTTL at A7  Info (169178): Pin Input uses I/O standard 3.3-V LVTTL at C8    This warning doesn't have any effect on the complitation, i am just concerned if it has any effect on the hardware i am connecting to. The input coming from my external hardware to development board GPIO pins are 3.3 V LVTTL  --- Quote End ---    These are all completely normal INFO lines for this board. All the I/Os are in a 3.3V bank (not changeable). You can alter the class from LVTTL to LVCMOS, and change drive strength, etc as required via commands in the .qsf file for the design. 3.3V LVTTL at 8ma is the typical setup. Nothing to worry about.

[Altera_Forum]

ak6dn & Anand thanks to both of you for your help.