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Definition
Computer chips of today are synchronous. They contain a main clock, which controls
the timing of the entire chips. There are problems, however, involved with these
clocked designs that are common today.One problem
is speed. A chip can only work as fast as its slowest component. Therefore, if
one part of the chip is especially slow, the other parts of the chip are forced
to sit idle. This wasted computed time is obviously detrimental to the speed of
the chip. New problems with speeding up a
clocked chip are just around the corner. Clock frequencies are getting so fast
that signals can barely cross the chip in one clock cycle. When we get to the
point where the clock cannot drive the entire chip, we'll be forced to come up
with a solution. One possible solution is a second clock, but this will incur
overhead and power consumption, so this is a poor solution. It is also important
to note that doubling the frequency of the clock does not double the chip speed,
therefore blindly trying to increase chip speed by increasing frequency without
considering other options is foolish. The
other major problem with c clocked design is power consumption. The clock consumes
more power that any other component of the chip. The most disturbing thing about
this is that the clock serves no direct computational use. A clock does not perform
operations on information; it simply orchestrates the computational parts of the
computer. New problems with power consumption
are arising. As the number of transistors on a chi increases, so does the power
used by the clock. Therefore, as we design more complicated chips, power consumption
becomes an even more crucial topic. Mobile electronics are the target for many
chips.
These chips need to be even more conservative
with power consumption in order to have a reasonable battery lifetime.The
natural solution to the above problems, as you may have guessed, is to eliminate
the source of these headaches: the clock.
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