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參數(shù)資料
| 型號： | 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） |
| 文件頁數(shù)： | 10/18頁 |
| 文件大小： | 233K |
| 代理商： | 23380A |
10
SDRAM Performance Monitors with the élanSC520 Microcontroller Application Note
The ADDIE starts with an initial value of 50%. As the
input data is sampled, the ADDIE’s counter value
moves toward the expected value. After about 500
samples, the ADDIE closely tracks the input data
stream. This indicates that after as little as 500 sam-
ples, the counter is read to produce an estimate of the
performance parameter being measured.
The data shown in Figure 3 indicates the average of
over 250 inputs and ADDIE streams. Keeping this ratio
small helps one to observe temporary fluctuations in
both the generated test data and ADDIE response.
Figure 4 shows the 8-bit ADDIE used to measure a
78% probability. The 8-bit counter was initially at a
value of 128, which represents a probability of 50%.
After about 500 samples, the measuring instrument
converges on the desired value.
Figure 4.
8-Bit ADDIE Measuring 78% (200/255)
200
100
300
400
600
500
700
800
0
0
30
90
60
150
210
255
180
900
120
Measured Value
Input Test Data
240
100%
Probability: 100% = 255/255
Data Samples
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