By Steve Kilts
This e-book presents the complex problems with FPGA layout because the underlying subject matter of the paintings. In perform, an engineer usually should be mentored for a number of years ahead of those ideas are effectively applied. the themes that may be mentioned during this publication are necessary to designing FPGA's past average complexity. The aim of the ebook is to offer useful layout innovations which are differently purely on hand via mentorship and real-world adventure.
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Extra resources for Advanced FPGA Design: Architecture, Implementation, and Optimization
Dynamic power dissipation drops off with the square of the core voltage, but reducing voltage will have a negative impact on performance. Because the core voltage on an FPGA will be rated from 5% to 10% of the speciﬁed value, great care must be given to this from a system perspective. Typically, power issues can be addressed with other techniques while keeping the core voltage well within the speciﬁed range. 4 DUAL-EDGE TRIGGERED FLIP-FLOPS Due to the fact that power dissipation is proportional to the frequency that a signal toggles, it is desirable to maximize the amount of functionality for each toggle of a high fan-out net.
For transmission lines with shunt termination at the load, a series termination may be used as an alternate depending on the requirements of the system. 6, there is not steady-state current dissipation with a series termination. There is no steady-state current dissipation with a series termination. The disadvantages are . An initial reﬂection from the load to the terminating resistor . 6 Termination types. 46 Chapter 3 Architecting Power If these performance characteristics are acceptable for a given system, the series termination approach will eliminate static power dissipation through the termination resistor.
Adding register layers improves timing by dividing the critical path into two paths of smaller delay. Separating a logic function into a number of smaller functions that can be evaluated in parallel reduces the path delay to the longest of the substructures. By removing priority encodings where they are not needed, the logic structure is ﬂattened, and the path delay is reduced. Register balancing improves timing by moving combinatorial logic from the critical path to an adjacent path. Timing can be improved by reordering paths that are combined with the critical path in such a way that some of the critical path logic is placed closer to the destination register.