Very-large-scale Integration - Structured Design

Structured Design

Structured VLSI design is a modular methodology originated by Carver Mead and Lynn Conway for saving microchip area by minimizing the interconnect fabrics area. This is obtained by repetitive arrangement of rectangular macro blocks which can be interconnected using wiring by abutment. An example is partitioning the layout of an adder into a row of equal bit slices cells. In complex designs this structuring may be achieved by hierarchical nesting.

Structured VLSI design had been popular in the early 1980s, but lost its popularity later because of the advent of placement and routing tools wasting a lot of area by routing, which is tolerated because of the progress of Moore's Law. When introducing the hardware description language KARL in the mid' 1970s, Reiner Hartenstein coined the term "structured VLSI design" (originally as "structured LSI design"), echoing Edsger Dijkstra's structured programming approach by procedure nesting to avoid chaotic spaghetti-structured programs.

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Other articles related to "structured design, structured, design":

Application-specific Integrated Circuit - Structured Design
... Structured ASIC design (also referred to as "platform ASIC design"), is a relatively new term in the industry, resulting in some variation in its definition ... However, the basic premise of a structured ASIC is that both manufacturing cycle time and design cycle time are reduced compared to cell-based ASIC, by virtue of there being pre-defined metal layers (thus ... One definition states that In a "structured ASIC" design, the logic mask-layers of a device are predefined by the ASIC vendor (or in some cases by a third party) ...
Larry Constantine - Work - Structured Design
... While still an undergraduate at MIT he began work on what was to become structured design, formed his first consulting company, and taught in a postgraduate program at the ... The core of structured design, including structure charts and coupling and cohesion metrics, was substantially complete by 1968, when it was presented at the National Symposium on Modular Programming ... As part of Structured Design, Constantine developed the concepts of cohesion (the degree to which the internal contents of a module are related) and coupling (the ...

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