VLSI flashcards, diagrams and study guides
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A device having multiple electronic components and their interconnects manufactured on a single substrate.
Full Custom- Every gate is special. Basically not done anymore. ASIC- Gates all come from library, but connections all unique. SOC- Chip consists of blocks that were all created before. Silicon "printed circuit board". Real VLSI chips often use a little bit of all three styles in them. -Might be on custom analog block, ASIC gates, and a couple of larger "IP" blocks.
Gives the designer the most freedom. -Lots of rope -Can be clever -Can hang yourselves too For a specific function: -Can achieve best performance (speed, power, area, etc). -Most work/time per function. -Optimizations are at a low level. -Circuit better be important think assembler, only worse.
Static CMOS gates are very power efficient and they dissipate nearly zero power while idle. Power dissipation in CMOS is of 2 types namely 1.Static power dissipation 2.Dynamic power dissipation
1.Sub threshold condition through OFF transistors 2.Tunneling current through gate oxide 3.Leakage through reverse biased diodes 4.Contention current through ratioed circuits
1.Charging and discharging of load capacitance 2.Short circuit current while both pMOS and nMOS networks are partially ON