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| 型號(hào)： | 23380A |
| 英文描述： | SDRAM Performance Monitors with the ?lan?SC520 Microcontroller? 233KB (PDF) |
| 中文描述： | SDRAM的性能監(jiān)視器的？蘭？SC520微控制器？ 233KB（PDF格式） |
| 文件頁(yè)數(shù)： | 9/18頁(yè) |
| 文件大?。?/td> | 233K |
| 代理商： | 23380A |
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SDRAM Performance Monitors with the élanSC520 Microcontroller Application Note
9
differ, a difference in probability exists. This information
is fed back into the data stream to increase or decrease
the counter value. Consequently, with each new
comparison, the counter is adjusted to produce a
probability stream (from the comparator) which
matches the input data stream.
The ADDIE device effectively integrates the probability
stream. The result is that the probability stream is con-
verted into a digital value that is held in the counter,
which represents the probability of the parameter being
measured.
This method of measuring probability is very different
from the dual-counter method. No potential overflow
exists, and an overflow interrupt handler is not required.
The counter can be read at any time to give a measure
of the current probability.
8-bit ADDIE
As the number of bits used by the counter and random
number generator increase, the probability resolution is
improved. For example, an 8-bit counter provides for a
probability resolution of 0.39% (1/255). However,
increasing the resolution slows down the integration
process. This results in a greater number of samples
being required before a good estimate of probability
can be obtained. Figure 3 shows an 8-bit ADDIE used
to measure a probability of 25%.
Figure 3.
8-Bit ADDIE Measuring 25% (64/255)
160
80
240
320
480
400
560
640
720
0
0
30
90
60
150
210
255
180
800
120
Measured Value
Input Test Data
240
100%
Probability: 100% = 255/255
Data Samples
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