AR# 15083: 7.1i XST - How do I prevent the tools from using the global clock network (BUFG)?
7.1i XST - How do I prevent the tools from using the global clock network (BUFG)?
Keywords: routing, route, IBUF, clock_buffer
General Description: I do not want to use the BUFGs or global routing resources on my device. How do I prevent the tools from utilizing these resources?
To prevent a clock signal from being automatically routed to a global clock net, use the "buffer_type" attribute on the signal. For more information on using the "buffer_type" attribute, refer to the latest version of the XST User Guide and the Constraints Guide at: http://www.xilinx.com/support/software_manuals.htm.