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# 21480

Spartan-3/-3E, DCM - What is the functionality of the DSSEN pin?

Description

What does the DSSEN pin on the DCM do?

Solution

The DSSEN pin and the DSS_MODE attribute were prepared to support the Digital Spread Spectrum (DSS) feature in the DCM. This feature is not supported. However, the DSSEN pin remains an input pin in the DCM primitive to maintain compatibility with all DCM library versions.

For all designs using DCM, please connect the DSSEN pin to GND and leave DSS_MODE at its default value. If you are using Architecture Wizard (DCM/Clocking Wizard), this connection has been done automatically.

AR# 21480
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article