Download Design of Interconnection Networks for Programmable Logic by Guy Lemieux PDF

By Guy Lemieux

Programmable common sense units (PLDs) became the foremost implementation medium for nearly all of electronic circuits designed this day. whereas the highest-volume units are nonetheless equipped with full-fabrication instead of box­ programmability, the fad in the direction of ever fewer ASICs and extra FPGAs is obvious. This makes the sphere of PLD structure ever extra very important, as there's more advantageous call for for swifter, smaller, more cost-effective and lower-power programmable common sense. PLDs are ninety% routing and 10% common sense. This booklet specializes in that ninety% that's the programmable routing: the way during which the programmable wires are attached and the circuit layout of the programmable switches themselves. an individual looking to comprehend the layout of an FPGA must develop into lit­ erate within the complexities of programmable routing structure. This publication builds at the state of the art of programmable interconnect through supplying new equipment of investigating and measuring interconnect buildings, in addition to new programmable change uncomplicated circuits. The early component of this ebook presents a great survey of interconnec­ tion constructions and circuits as they exist at the present time. Lemieux and Lewis then offer a brand new approach to layout sparse crossbars as they're utilized in PLDs, and exhibit that the strategy works with an empirical validation. this is often certainly one of a couple of routing structure works that hire analytical the way to take care of the routing archi­ tecture layout. The research allows fascinating insights now not often attainable with the traditional empirical approach.

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These are indicated by small, open dots in the figure. The capacity of a crossbar, c, is the largest number of signals which are always routable for any assignment of signals to inputs. Clearly, 0 :::; c :::; m. The term population refers to the number of switches in the crossbar, p, such that 0 :::; p :::; n· m. This can also be expressed as a density. The capacity c is determined by p as well as the precise location of switches within the crossbar. The number of switches connecting to an input (or output) wire is itsjan-out (jan-in).

3. The LUT inputs are chosen from among a set of I shared cluster inputs. In these figures, SRAM bits are shown to represent the configuration state of the PLD. In practice, however, any memory technology can be used. The idea of clustering N BLEs into a CLB is explored in [BR97a]. Using a heuristic algorithm to pack lookup tables into fixed-size clusters, [BR97a] determines that architectures with N > 1 use less area than an unclustered architecture (N = O. In particular, clusters of size N = 4 are shown to require Models, Methodology and CAD Tools 29 10% fewer transistors.

Description minimum poly gate to contact separation minimum contact size minimum diffusion extent past contact minimum transistor gate length minimum contactable transistor width minimum separation between similar transistor types minimum separation between complementary transistor types minimum overall transistor length This area of one T includes the diffusion area, W x L, plus the separating space to an adjacent transistor, X, in both dimensions. Hence, the area of one Tis: T = (WminT+X) x (Z+X).

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