Zynqberry different voltages at VCCO and constraints

[hasanthesyrian]

How is the voltage set to 2.5V in the MIPI constraints but the VCCO bank voltage is 3.3v in the Zynqberry?

I know that XAPP894 requires 1.8V or 2.5V but can you just set the voltage in the constraints different than the VCCO bank voltage? Doesn't VCCO set the bank logic level?

[JH]

Hi,

Bank Voltage is fix 3.3V.
you can use LVDS_25 as input also if VCCO 3.3V as long as CM Level and Swing is in range. But this works only as input, see:
https://adaptivesupport.amd.com/s/article/43989?language=en_US

br
John

[hasanthesyrian]

Hi,

Bank Voltage is fix 3.3V.
you can use LVDS_25 as input also if VCCO 3.3V as long as CM Level and Swing is in range. But this works only as input, see:
https://adaptivesupport.amd.com/s/article/43989?language=en_US

br
John

Hello, thanks for your reply.

I will be using only MIPI inputs (cameras). What do you mean by CM level? VICM? The voltage swing is not mentioned in that article.

Also, termination is required. Do/es the resistors that are part of the XAPP passive implementation count?

[JH]

Hi,
sorry for late replay.
yes VICM is CM --> Common Mode level.

And yes external termination on the board is used like on xapp894.
AR43989 I mentioned show only that it's possible to use LVSD on 3.3V bank power, but in this case internal termination can't be used.

br
John