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VLSI & Computer Architecture (Hardcover)
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VLSI & Computer Architecture (Hardcover)
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Very-large-scale integration (VLSI) is the process of creating
integrated circuits by combining thousands of transistor-based
circuits into a single chip. The first semiconductor chips held one
transistor each. Subsequent advances added more and more
transistors, and as a consequence more individual functions or
systems were integrated over time. The first integrated circuits
held only a few devices, perhaps as many as ten diodes,
transistors, resistors and capacitors, making it possible to
fabricate one or more logic gates on a single device. Now known
retrospectively as "small-scale integration" (SSI), improvements in
technique led to devices with hundreds of logic gates, known as
large-scale integration (LSI), i.e. systems with at least a
thousand logic gates. Current technology has moved far past this
mark and today's microprocessors have many millions of gates and
hundreds of millions of individual transistors. As of early 2008,
billion-transistor processors are commercially available, an
example of which is Intel's Montecito Itanium chip. This is
expected to become more commonplace as semiconductor fabrication
moves from the current generation of 65 nm processes to the next 45
nm generations. Another notable example is Nvidia's 280 series GPU.
This microprocessor is unique in the fact that its 1.4 Billion
transistor count, capable of a teraflop of performance, is almost
entirely dedicated to logic (Itanium's transistor count is largely
due to the 24MB L3 cache). At one time, there was an effort to name
and calibrate various levels of large-scale integration above VLSI.
Terms like Ultra-large-scale Integration (ULSI) were used. But the
huge number of gates and transistors available on common devices
has rendered such fine distinctions moot. Terms suggesting greater
than VLSI levels of integration are no longer in widespread use.
Even VLSI is now somewhat quaint, given the common assumption that
all microprocessors are VLSI or better.
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