668 CHAPTER 13 / ALTERNATIVE SYNCHRONOUS FSM ARCHITECTURES
considerable knowledge of the use and interpretation of this software is needed before
reliable designs can result. But even with that knowledge, the designer must still deal
with a variety of timing problems. In some system-level designs timing is everything and
improper routing delays can cause malfunction of the system. Fortionately, Xilinx Corp.
has taken this into account and has provided generous routing resources in their XC4000E
and XC4000XV series FPGAs and have made them reprogrammable an unlimited number
of times. The section on Futher Reading at the end of this chapter cites relevant sources of
information on this subject.
If it is the designer’s intent to use a so-called programmable ...