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XC4000E加法器和计数器的性能评估.pdf
消耗积分:5 |
格式:rar |
大小:333 |
2009-05-15
h1654155275.3132
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In most LCA designs, performance cannot be estimated
with any accuracy until after implementation. This is
because the performance is affected by routing delays;
and, prior to implementation, these are not known. However,
in adders and counters using the XC4000E dedicated
carry logic, delay estimation is possible.
The carry path in an adder uses dedicated interconnects
between CLBs. These interconnects introduce a fixed
delay, even when the carry passes from one CLB column to
the next at the top or bottom of the array. This permits the
routing delay to be incorporated into the CLB specifications
published in the data book. Consequently, the propagation
delay through an adder can be calculated directly from the
data book specifications.
with any accuracy until after implementation. This is
because the performance is affected by routing delays;
and, prior to implementation, these are not known. However,
in adders and counters using the XC4000E dedicated
carry logic, delay estimation is possible.
The carry path in an adder uses dedicated interconnects
between CLBs. These interconnects introduce a fixed
delay, even when the carry passes from one CLB column to
the next at the top or bottom of the array. This permits the
routing delay to be incorporated into the CLB specifications
published in the data book. Consequently, the propagation
delay through an adder can be calculated directly from the
data book specifications.
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