要不要上拉？

9054的DataBook上说：

All Local Bus internal pull-ups go through a 100k-ohm
resistor. All Local Bus internal pull-downs go through a
50k-ohm resistor.
All Local I/O pins should have external pull-ups or
pull-downs, which depend upon the application and
pin polarity. (Use approximately 3k to 10k ohms.) This
is recommended due to the weak value of the internal
pull-ups and pull-downs.

怎么local端的所有引脚有都要加上拉或下拉？？？
真的要把所有的local pins都加吗？

已给分，谢谢回答！
但能不能说得更清楚些？跟什么应用有关？
我看9054RDK上的LD[31..0]就没有接上下拉。其它local pins都接了的！不知道为什么。