AR# 15060

Virtex-II Pro RocketIO - If I have a single REFCLK driving two or more MGTs on opposite sides of the chip, will REFCLK be routed through a BUFG to minimize skew?

Description

If I have a single REFCLK driving two or more MGTs on opposite sides of the chip, will REFCLK be routed through a BUFG to minimize skew?

Solution

The ideal solution in this case is to bring REFCLK in through two separate input pins. If this is not possible, a BUFG can be used to distribute a single REFCLK input throughout the chip. However, be aware that routing REFCLK through a BUFG can lead to excessive jitter.

AR# 15060
Date 12/15/2012
Status Active
Type General Article