UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 11621

Virtex-II Configuration - What voltage should be applied to Vcco_4 and Vcco_5?

Description

When I configure a Virtex-II device, what voltage should I apply to Vcco_4 and Vcco_5?

Solution

Vcco_4 must meet the POR condition. Beyond this, Vcco_4 and Vcco_5 are dependent upon Configuration modes, and characteristics of the device.

1. POR:

Vcco_4 must be > 1.5V

If Power-up is at room temperature, Vcco_4 > or = 1.5V is acceptable.

2. Clamp diodes

Every I/O pin has intrinsic clamp diodes to Vcco and GND. Over or undervoltage will cause these diodes to turn on. While transient over or undershoot in this fashion will not cause reliability concerns, it will cause signal integrity problems. Such problems might result in functional errors, such as configuration failure.

3. Configuration:

Configuration Vcco requirements
Configuration Vcco requirements

AR# 11621
Date Created 08/29/2007
Last Updated 12/15/2012
Status Active
Type General Article