Answers Database

9500:CPLDs can not source logic with a global buffer


Record #3567

Product Family:  Hardware

Product Line:  9500

Problem Title:
9500:CPLDs can not source logic with a global buffer


Problem Description:
Keywords:  cpld, 9500, global, buffer, bufg

Urgency:  standard

General Description:  Internal logic (anything other than a clock pin) can not b
e driven with a global buffer.


Solution 1:

If you try to use a global buffer to drive logic it will use a regular IBUF inst
ead.

If you try to have a global buffer drive a CLK pin and also drive logic, it will
 use a BUFG for the CLK net and an IBUF for the logic.	(this will not use anoth
er pad)

GLOBAL CLOCK BUFFERS CAN ONLY DRIVE CLOCK PINS OF FLIP FLIPS IN 9500



End of Record #3567