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AR# 7383

Virtex Configuration - How many loads can the configuration pin CCLK drive?

Description

Urgency: Standard

General Description:

How many loads can CCLK drive? In a daisy chained application, there could be multiple PROMs and FPGAs driven by a single CCLK.

Solution

The rule of thumb is 8 loads maximum on a single CCLK. A separate driver might be necessary for more than 8 loads. In addition, the faster the configuration rate is, the greater the possibility a driver will be needed for multiple loads.

An alternative would be to break up one long configuration chain into two(or more) smaller chains so there will be multiple Masters. This will effectively reduce the load on CCLK.

AR# 7383
Date Created 08/21/2007
Last Updated 12/15/2012
Status Active
Type General Article