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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)： | 11/18頁(yè) |
| 文件大小： | 233K |
| 代理商： | 23380A |
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SDRAM Performance Monitors with the élanSC520 Microcontroller Application Note
11
12-bit ADDIE
The time taken by the ADDIE’s counter to move from its
current position to the desired value is dependent on
the number of bits used by the counter. An 8-bit counter
takes only 256 clock pulses to increment through its full
range. A 12-bit counter takes 4096 clock pulses to
cover its complete range. The extra 4 bits of probability
resolution requires 16 times more clock pulses to scan
its complete counting range. This condition directly
relates to the number of samples required to measure
a performance parameter. Greater resolution requires
a greater number of samples to achieve a
measurement with similar results. Figure 5 shows a
12-bit ADDIE used to measure a 78% probability. The
counter was initiated with a 50% probability. The results
show that about 10,000 samples where required before
the input and measured probability streams converge.
The larger ADDIE offers greater measurement resolu-
tion. However, for measuring on-chip performance
parameters, an 8-bit counter appears adequate. The
smaller ADDIE provides the benefit of more quickly
converging on the required value and better tracking
local fluctuations of the input data stream.
Figure 5.
12-Bit ADDIE Measuring 78% (3200/4095)
4,000
2,000
6,000
8,000
12,000
10,000
14,000
0
0
400
1200
800
2000
2800
3600
2400
1600
Measured Value
3200
100%
Probability: 100% = 4095/4095
Data Samples
Input Test Data
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