Designing Asynchronous Circuits using NULL Convention Logic by Jia Di

By Jia Di

Designing Asynchronous Circuits utilizing NULL conference common sense (NCL) starts off with an creation to asynchronous (clockless) good judgment often, after which specializes in delay-insensitive asynchronous good judgment layout utilizing the NCL paradigm. The publication info layout of input-complete and observable dual-rail and quad-rail combinational circuits, after which discusses implementation of sequential circuits, which require datapath suggestions. subsequent, throughput optimization concepts are awarded, together with pipelining, embedding registration, early finishing touch, and NULL cycle relief. as a consequence, low-power layout recommendations, reminiscent of wavefront steerage and Multi-Threshold CMOS (MTCMOS) for NCL, are mentioned. The publication culminates with a finished layout instance of an optimized maximum universal Divisor circuit. Readers must have previous wisdom of simple good judgment layout innovations, similar to Boolean algebra and Karnaugh maps. After learning this ebook, readers must have a great realizing of the diversities among asynchronous and synchronous circuits, and may have the ability to layout arbitrary NCL circuits, optimized for quarter, throughput, and tool. desk of Contents: creation to Asynchronous good judgment / review of NULL conference good judgment (NCL) / Combinational NCL Circuit layout / Sequential NCL Circuit layout / NCL Throughput Optimization / Low-Power NCL layout / complete NCL layout instance

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Additional info for Designing Asynchronous Circuits using NULL Convention Logic (NCL) (Synthesis Lectures on Digital Circuits and Systems)

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From these equations, the synchronous state machine can be directly implemented as shown in Fig. 4. 2: Minimal state diagram for non-resetting Mealy machine to detect 010 or 101. 3: Mealy machine K-maps. 2 and the D-type flip-flops replaced with a three-stage NCL register, as shown in Fig. 5. 1. 4: Synchronous Mealy machine implementation. 8V 180nm process), since this allows the DATA and NULL wavefronts to propagate more independently. To optimize the design, input-incomplete AND/NAND/OR/NOR functions should be used whenever possible.

3. QUAD-RAIL NCL DESIGN 27 A represents a quad-rail signal. 14: Quad-rail PP generation component. 15: K-maps for quad-rail PP generation component. complete would increase PPH’s worse-case delay from 1 gate to 2 gates; therefore, additional terms are added to PPL to make it input-complete with respect to both A and B, as shown in the PPL0 equations. Since the first product term, A0 , is missing B, B is added to the product term by ANDing it with logic 1, formed by ORing all rails of B together.

1. 4: Synchronous Mealy machine implementation. 8V 180nm process), since this allows the DATA and NULL wavefronts to propagate more independently. To optimize the design, input-incomplete AND/NAND/OR/NOR functions should be used whenever possible. , for an n-input function, one THnn and one TH1n gate are required). , an input-complete 4-input AND function will require 3 inputcomplete 2-input AND functions, totaling 6 gates and 2 gate delays). In this case, the inherently input-complete XOR function is input-complete with respect to X and QC , such that using an input-complete AND function to generate Z makes Z input-complete with respect to X, QB , and QC .

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