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电子发烧友网>电子资料下载>电子书籍>Asic design guide&nb

Asic design guide&nb

2006-03-27 | rar | 1777 | 次下载 | 免费

资料介绍

ICs are made on a wafer. Circuits are built up with successive mask layers. The number of
masks used to define the interconnect and other layers is different between full-custom
ICs and programmable ASICs

Full-Custom ASICs
All mask layers are customized in a full-custom ASIC.
It only makes sense to design a full-custom IC if there are no libraries available.
Full-custom offers the highest performance and lowest part cost (smallest die size) with the
disadvantages of increased design time, complexity, design expense, and highest risk.
Microprocessors were exclusively full-custom, but designers are increasingly turning to
semicustom ASIC techniques in this area too.
Other examples of full-custom ICs or ASICs are requirements for high-voltage (automobile),
analog/digital (communications), or sensors and actuators.

Standard-Cell–Based ASICs

A cell-based ASIC (CBIC—“sea-bick”)
• Standard cells
• Possibly megacells, megafunctions, fullcustom
blocks, system-level macros (SLMs),
fixed blocks, cores, or Functional Standard
Blocks (FSBs)
• All mask layers are customized—transistors and
interconnect
• Custom blocks can be embedded
• Manufacturing lead time is about eight weeks.

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