By Steve Kilts
This publication offers the complicated problems with FPGA layout because the underlying subject matter of the paintings. In perform, an engineer quite often should be mentored for numerous years ahead of those ideas are properly applied. the subjects that might be mentioned during this publication are necessary to designing FPGA's past reasonable complexity. The aim of the booklet is to provide functional layout strategies which are in a different way in simple terms to be had via mentorship and real-world adventure.
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Extra info for Advanced FPGA Design: Architecture, Implementation, and Optimization
By using a different reset than what was available on this device, however, a signiﬁcant amount of logic was created around it to implement the asynchronous reset. 4 Resetting RAM There are reset resources in many built-in RAM (Random Access Memory) resources for FPGAs, but similar to the DSP resource described in the previous sections, often only synchronous resets are available. Attempting to implement an asynchronous reset on a RAM module can be catastrophic to area optimization because there are not smaller elements that can be optimally used to construct a RAM (like a multiplier and an adder can be stitched together to form a MAC module) other than smaller RAM resources, nor can the synthesis tool easily add a few gates to the output to emulate this functionality.
Again, the only variation we will consider in the above code is the type of reset: synchronous versus asynchronous. In Xilinx Virtex-4 devices, for example, BRAM (Block RAM) elements have synchronous resets only. 9. 10. 4. Improperly resetting a RAM can have a catastrophic impact on the area. 5 31 Utilizing Set/Reset Flip-Flop Pins Most FPGA vendors have a variety of ﬂip-ﬂop elements available in any given device, and given a particular logic function, the synthesis tool can often use the set and reset pins to implement aspects of the logic and reduce the burden on the look-up tables.
Impact of FPGA resources that lack set capability. Impact of FPGA resources that lack asynchronous reset capability. Impact of RAM reset. Optimization using set/reset pins for logic implementation. Advanced FPGA Design. By Steve Kilts Copyright # 2007 John Wiley & Sons, Inc. 1 ROLLING UP THE PIPELINE The method of “rolling up the pipeline” is the opposite operation to that described in the previous chapter to improve throughput by “unrolling the loop” to achieve maximum performance. When we unrolled the loop to create a pipeline, we also increased the area by requiring more resources to hold intermediate values and replicating computational structures that needed to run in parallel.