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width="150"><br />掃碼關(guān)注<br />獲取最新最全汽車(chē)電子<br />技術(shù)方案與實(shí)用技巧</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="1611611" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="6166111" class="content" id="contentDiv" style="position:relative;"> <div id="6116666" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;">補(bǔ)償工作電壓的降低帶來(lái)的速度下降[26，27]。多電壓技術(shù)，是針對(duì)不同的性能要求，系統(tǒng)中各部分也采用不同的工作電壓以節(jié)省功耗，但這需要額外的片內(nèi)電壓轉(zhuǎn)換器。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">③編碼優(yōu)化</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">常用的二進(jìn)制編碼中，采用所有空閑的高位作符號(hào)擴(kuò)展位，這將增加耗能的跳變。符號(hào)-數(shù)值編碼(如格雷碼等)方法只用最高位代表符號(hào)，如果用它來(lái)代替二進(jìn)制編碼，可以減少由于數(shù)據(jù)符號(hào)改變而產(chǎn)生的功耗。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">2)動(dòng)態(tài)功耗管理技術(shù)</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">是系統(tǒng)級(jí)功耗優(yōu)化中的一個(gè)有效手段。根據(jù)負(fù)載的請(qǐng)求，子系統(tǒng)可以分為工作和空閑模式。在空閑模式下，可以將子系統(tǒng)關(guān)斷，進(jìn)入低功耗的待機(jī)(Standby)</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">和不消耗能量的睡眠(Sleep)狀態(tài);反之，則將子系統(tǒng)喚醒，進(jìn)入正常的工作模式。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">這種有選擇地關(guān)斷空閑的子系統(tǒng)，降低功耗的效果十分顯著，如在PC系統(tǒng)級(jí)功耗管理中，最常見(jiàn)的是將無(wú)執(zhí)行任務(wù)的硬盤(pán)和顯示器關(guān)斷以節(jié)省功耗。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">這種方案的局限性在于，在功耗狀態(tài)切換過(guò)程中，通常有延遲，喚醒處于睡眠狀態(tài)的子系統(tǒng)也需要更多的能量。因此，DPM技術(shù)需要解決以下問(wèn)題：一是何時(shí)將子系統(tǒng)關(guān)斷，關(guān)斷多久;二是是否值得關(guān)斷，即恢復(fù)狀態(tài)是否需要更多的能量。這些都是判決策略需要研究的內(nèi)容，目前最常用的方法可分為三種：基于超時(shí)(Timeout)的方法、基于預(yù)估算(Predictive)的方法、基于隨機(jī)理論(Stochastic)的方法。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">和上述改變子系統(tǒng)的功耗狀態(tài)不同，動(dòng)態(tài)電壓等比例變化(Dynamic Voltage Scaling， DVS)技術(shù)是根據(jù)系統(tǒng)的工作狀態(tài)，基于區(qū)間(Interval-based)或基于線程(Thread-based)來(lái)預(yù)測(cè)系統(tǒng)負(fù)載[33，34]，動(dòng)態(tài)地改變系統(tǒng)的工作電壓。動(dòng)態(tài)電壓和頻率等比例變化(Dynamic Voltage and Frequency Scaling)技術(shù)則是同時(shí)改變工作電壓和頻率，獲得最低的系統(tǒng)功耗。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">和靜態(tài)低功耗設(shè)計(jì)相比，DPM技術(shù)由于要預(yù)測(cè)系統(tǒng)和負(fù)載、系統(tǒng)和電源的關(guān)系，動(dòng)態(tài)地調(diào)整工作狀態(tài)、電壓和頻率，對(duì)系統(tǒng)工作狀態(tài)的建模、預(yù)測(cè)算法都更復(fù)雜，有更多的工作急待開(kāi)展，但是可以肯定的是，DPM技術(shù)降低功耗的效果也更顯著。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">2寄存器傳輸級(jí)</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">作為綜合(排序和分配)的高層次結(jié)構(gòu)，RTL層次將包含一個(gè)控制部分(也稱控制器)和一個(gè)操作部分(也稱數(shù)據(jù)通路)，如圖2.1. 3所示。</P><CENTER style="WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; FONT: 12px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px"><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" style="BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; BORDER-TOP: 0px; BORDER-RIGHT: 0px; PADDING-TOP: 0px" alt="鋰離子電池管理芯片的研究及其低功耗設(shè)計(jì) — 數(shù)?；旌想娐返牡凸? src="http://editerupload.eepw.com.cn/fetch/20140213/228868_3_0.jpg" width=500 height=178></CENTER><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">數(shù)據(jù)通路以寄存器為特征，而控制器是由組合邏輯來(lái)實(shí)現(xiàn)，因此，RTL級(jí)低功耗設(shè)計(jì)的對(duì)象將是時(shí)序和組合邏輯，這可以采用硬件描述語(yǔ)言VHDL和VERILOG來(lái)實(shí)現(xiàn)。另外，RTL的抽象層次決定了它不可能涉及電源電壓和電容，因此降低功耗的途徑主要是降低開(kāi)關(guān)活動(dòng)因子，即減小寄存器和組合邏輯的跳變頻率。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">1)操作數(shù)</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">在RTL層次，操作數(shù)分離(Operand Isolation )是針對(duì)組合邏輯最常用的低功耗技術(shù)，其本質(zhì)是在組合邏輯模塊間加入一個(gè)鎖存器，當(dāng)鎖存器的使能無(wú)效時(shí)，寄存器保存值不加以更新，組合路徑被隔斷[36，37]。只有在進(jìn)行有效運(yùn)算時(shí)，組合邏輯才有耗能的跳變產(chǎn)生，這樣便降低了此模塊的功耗。</P><P style="TEXT-ALIGN: left; PADDING-BOTTOM: 0px; WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 2em; MARGIN: 10px 25px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT: 14px/22px 宋體, Georgia, verdana, serif; WHITE-SPACE: normal; ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(68,68,68); WORD-SPACING: 0px; PADDING-TOP: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px">操作數(shù)變形(Operand Transformation)有時(shí)也稱為數(shù)據(jù)通路的重排序，即是指在不影響邏輯功能的條件下，以翻轉(zhuǎn)頻率最低為策略，對(duì)電路單元重新排序來(lái)降低功耗的技術(shù)。</P><P style="TEXT-AL </span>  <div 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