Цитата(KPiter @ Mar 4 2011, 19:32)

Зачем BUFH нужен? Почему нельзя обойтись BUFG, BUFR?
Так вроде же у супостата
тут всё уже написано:
Цитата(awillen)
Цитата(yjgao)
There is a BUFH in Virtex-6 device which is not available in Virtex-4 and Virtex-5. Can you tell me the function of it and when to use it and how to use it?
From the Xilinx Virtex-6 Libraries Guide: "The BUFH primitive is provided to allow instantiation capability to access the HCLK clock buffer resources. The use of this component requires manual placement and special consideration and thus is recommended for more advanced users. Please refer to the Virtex-6 FPGA Clocking Resources User Guide (UG362) for details in using this component."
You usually don't have to bother with this module, unless you know what you're doing.
...Обращаю особое внимание на последную приведённую строчку.
Если есть какие-то конкретные вопросы - их надо конкретно задавать, иначе вряд ли кто что ответит, акромя:
You usually don't have to bother with this module, unless you know what you're doing.