By Steve Kilts
This publication presents the complex problems with FPGA layout because the underlying topic of the paintings. In perform, an engineer in most cases should be mentored for numerous years sooner than those rules are properly applied. the subjects that would be mentioned during this booklet are necessary to designing FPGA's past reasonable complexity. The target of the booklet is to give sensible layout suggestions which are differently simply on hand via mentorship and real-world adventure.
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Extra resources for Advanced FPGA Design: Architecture, Implementation, and Optimization
In general, FPGAs are synchronous devices, and a number of difﬁculties arise when multiple domains are introduced through gating or asynchronous interfaces. For a more in-depth discussion regarding clock domains, see Chapter 6. 1 illustrates the poor design practice of simple clock gating. With this clock topology, all ﬂip-ﬂops and corresponding combinatorial logic is active (toggling) whenever the Main Clock is active. The logic within the dotted box, however, is only active when Clock Enable ¼ 1.
Thus, by allowing the synthesis tool to choose a ﬂip-ﬂop with a synchronous set, we are able to implement this function with zero logic elements. 15 Simple asynchronous reset. 16 Optimization without reset. We can take this one step further by using both synchronous set and reset signals. iDat3 & (iDat1 j iDat2) we can code this in such a way that both the synchronous set and reset resources are used: module setreset ( output reg oDat, input iClk, input iDat1, iDat2, iDat3); always @(posedge iClk) if(iDat3) oDat <= 0; else if(iDat1) oDat <= 1; else oDat <= iDat2; endmodule Here, the iDat3 input takes priority similar to the reset pin on the associated ﬂip-ﬂops.
It is important to note, however, that lowering the voltage will also decrease the performance of the system. If this method is used, ensure that the timing analysis takes into consideration the lowest possible voltage on the supply rail for worst-case maximum timing. 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.