By Steve Kilts
This booklet offers the complicated problems with FPGA layout because the underlying topic of the paintings. In perform, an engineer usually has to be mentored for numerous years earlier than those rules are properly applied. the subjects that would be mentioned during this ebook are necessary to designing FPGA's past reasonable complexity. The objective of the ebook is to give sensible layout recommendations which are in a different way simply on hand via mentorship and real-world event.
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Additional info for Advanced FPGA Design: Architecture, Implementation, and Optimization
This new clock net will require a low-skew path to all ﬂip-ﬂops in its domain, similar to the system clock from which it was derived. For the ASIC designer, these low-skew lines can be built in the custom clock tree, but for the FPGA designer this presents a problem due to the limited number and ﬁxed layout of the low-skew lines. A gated clock introduces a new clock domain and will create difﬁculties for the FPGA designer. The following sections address the issues introduced by gated clocks. 1 Clock Skew Before directly addressing the issues related to gated clocks, we must ﬁrst brieﬂy review the topic of clock skew.
SUMMARY OF KEY POINTS Rolling up the pipeline can optimize the area of pipelined designs with duplicated logic in the pipeline stages. Controls can be used to direct the reuse of logic when the shared logic is larger than the control logic. For compact designs where area is the primary requirement, search for resources that have similar counterparts in other modules that can be brought to a global point in the hierarchy and shared between multiple functional areas. An improper reset strategy can create an unnecessarily large design and inhibit certain area optimizations.
Here we were able to create a global 11-bit counter that satisﬁed the requirement of both module A and module B. For compact designs where area is the primary requirement, search for resources that have similar counterparts in other modules that can be brought to a global point in the hierarchy and shared between multiple functional areas. 4 25 IMPACT OF RESET ON AREA A common misconception is that the reset structures are always implemented in a purely global sense and have little effect on design size.
Advanced FPGA Design: Architecture, Implementation, and Optimization by Steve Kilts