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參數(shù)資料
| 型號(hào)： | 21928 |
| 英文描述： | Low-Frequency, Spread-Spectrum EconOscillator |
| 中文描述： | 的AMD - K6 - 2E處理器數(shù)據(jù)手冊(cè)3DNow?。考夹g(shù)手冊(cè) |
| 文件頁(yè)數(shù)： | 69/72頁(yè) |
| 文件大?。?/td> | 845K |
| 代理商： | 21928 |
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21928G/0—March 2000
3DNow! Technology Manual
Chapter 3
Division and Square Root
59
3
Division and Square Root
Division
The 3DNow! instructions can be used to compute a very fast,
highly accurate reciprocal or quotient.
Consider the quotient q = a/b. An on-chip, ROM-based table
lookup can be used to quickly produce a 14–15 bit precision
approximation of 1/b (using just one two-cycle latency
instruction—PFRCP). A full-precision reciprocal can then
quickly be computed from this approximation using a
Newton-Raphson algorithm.
The general Newton-Raphson recurrence for the reciprocal is as
follows:
Z
i +1
←
Z
i
(2 – b Z
i
)
Given that the initial approximation is accurate to at least 14
bits, and that full IEEE single precision contains 24 bits of
mantissa, just one Newton-Raphson iteration is required. The
following shows the 3DNow! instruction sequence to produce
the initial reciprocal approximation, to compute the
full-precision reciprocal from this, and lastly, to complete the
required division of a/b.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 2192VE | 3.3V In-System Programmable SuperFAST⑩ High Density PLD |
| 21934 | CAPACITIVE SENSOR |
| 21A | Low-Frequency Dual EconOscillator |
| 21B | Low-Frequency Dual EconOscillator |
| 21C | Low-Frequency Dual EconOscillator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 219-2-8235-1 | 制造商:Airpax 功能描述:CIRCUIT PROTECTOR HYD MAGNETIC 制造商:Airpax 功能描述:CIRCUIT BREAKER MAG-HYDR LEVER 制造商:Sensata Technologies 功能描述:219-2-8235-1 /Pole # 2 /Prod Family: 0209 |
| 219-2-8696-1 | 制造商:Airpax 功能描述:CIRCUIT BREAKER MAG-HYDR LEVER 制造商:Sensata Technologies 功能描述:219-2-8696-1 /Pole # 2 /Prod Family: 0209 |
| 21-9290 | 制造商:Tenma 功能描述:Soldering Iron Pencil 25W 制造商:TENMA 功能描述:PENCIL SOLDERING IRON 25 WATT |
| 219-2-9344-1 | 制造商:Airpax 功能描述:CIRCUIT PROTECTOR HYD MAGNETIC 制造商:Sensata Technologies 功能描述:219-2-9344-1 /Pole # 2 /Prod Family: 0209 |
| 21-9295 | 制造商:Tenma 功能描述:Soldering Iron Pencil 45W 制造商:TENMA 功能描述:PENCIL SOLDERING IRON 40 WATT |
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