Answers Database Virtex: What is an IBUFG and what can I use it for? Record #5304 Product Family: Hardware Product Line: Virtex Product Part: V300 Problem Title: Virtex: What is an IBUFG and what can I use it for? Problem Description: Urgency: Standard General Description: What is the IBUFG primitive in Virtex and what can I use it for? Solution 1: The IBUFG is a dedicated clock input pin for a DLL or associated BUFG. There are four of these pins , one for each DLL/BUFG. They are input only and can use one of the many input voltage standards available. Banking rules will need to be followed and the associated bank number can be found on the Virtex datasheets for that particular device/package comibination. The IBUFG has a dedicated route to it's associated DLL. This ensures smallest delay and increased accuracy in use of the DLL. However, the DLL inputs can be driven by other device pins. Similarly, the IBUFG can be routed to user logic and does not have to be routed to a DLL. Please keep in mind that by not using the IBUFG for an input to the DLL, you are introducing additional delay. End of Record #5304 - Last Modified: 01/12/99 14:05

For the latest news, design tips, and patch information on the Xilinx design environment, check out the Technical Tips!