Max10 10m25 dual supply; jtag volatge

Altera_Forum · ‎07-19-2017

I'm working on a schematic with a 10M25DAF256I7G.

I'm going to power the FPGa with supply scheme as stated on Pin Connection Guide Line page 20:

VCC: 1.2V

VCCINT: 1.2V

VCCD_PLL: 1.2V

VCCA:2.5V

VCCA_ADC:2.5V

VCCIO:3.3V

I have a problem to understand the JTAG pull-up voltage.

As stated on Pin Connection Guide Line: "for configuration voltage of 2.5v, 3.0v or 3.3v, connect this pin through a 10kohm resistor to 2.5v (vccio bank 1 b) to prevent voltage overshoot..."

But my VCCIO is 3.3V for all banks. Why it says 2.5V?

Furthermore in the MAX10 Configuration User guide on page 3-3 the pull resistor are at VCCIO Bank 1B with clamp diode. So i think i can pull-up to 3.3V.

My question is:

If i use a configuration scheme as stated on page 20 of the Pin Connection Guide Line, how do i have to connect the jtag pull-up resistor for JTAG signals? Is it 2.5V or 3.3V with diode as stated in the Connection guide line?

Thanks

Altera_Forum · ‎07-20-2017

Yes, you can connect the pull-ups to 3.3V.

Refer to the 'max 10 fpga configuration user guide (https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/max-10/ug_m10_config.p...)', and figure 3-1 on page 3-3. Pull-ups are tied to VCCIO of bank 1 or 1B, depending on device.

Cheers,

Alex