Forum Discussion

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

Voltage level issue on MAX10

Hello, i'm trying to test my MAX10 using clock of 1MHz on some pins. one of the HW pins is not output the signal as expected, the clock goes high to 3.3v and then down to 1.6v instead of 0v. t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

I have a similar issue.. I am creating a 150MHz clock from the internal PLL using using a 25MHz external clock.

I changed the clock assignment to 100Mhz and the output looks great. I am using 10M02SCE144C8G

My 25MHZ clock is applied to pin 27

My 150MHZ clock comes out on pin 141,

I have a TP at pin 31, where I send a copy of the signal.

On pin 141 I have a series termination resistor. which I have lifted one side...

Not understanding why the frequency is ok but voltage levels are off..

my PLL outputs are:

C0 100MHZ internal

C1 100MHz external

C2 150MHz external

C3 FPGA_PIN31

Any help would be great..