DSQC 662,3HAC026254-001
DSQC 662,3HAC026254-001聯(lián)系人:李先生
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DSQC 662,3HAC026254-001
存儲(chǔ)器加速器
意法半導(dǎo)體的自適應(yīng)實(shí)時(shí)(ART)存儲(chǔ)器加速器(如下圖所示)可讓Cortex-M3內(nèi)核釋放最高的處理性能,雖然閃存本身需要等待狀態(tài),但是,引入這項(xiàng)技術(shù)后,STM32-F2以120 MHz的速度從閃存執(zhí)行代碼無等待狀態(tài)。
存儲(chǔ)器接口是128位寬,每次可取4-8條THUMB2指令。如果執(zhí)行線性代碼,因?yàn)轭A(yù)取指功能,即便閃存速度只是內(nèi)核的四分之一,代碼執(zhí)行也不會(huì)出現(xiàn)等待狀態(tài)。
然而,如果執(zhí)行轉(zhuǎn)移或跳轉(zhuǎn)指令,需要立即取出轉(zhuǎn)移或跳轉(zhuǎn)目標(biāo)地址的數(shù)據(jù),這樣,存儲(chǔ)器的等待狀態(tài)會(huì)增加系統(tǒng)開銷,這就是ART及其64項(xiàng)高速指令緩存發(fā)揮作用的地方。如果非順序指令第一次出現(xiàn),這條指令將從存儲(chǔ)器中取出并保存在64 項(xiàng)高速緩存的一個(gè)存儲(chǔ)項(xiàng)內(nèi)。在下一次出現(xiàn)時(shí),該指令將從高速緩存中直接取出,沒有等待狀態(tài)。
這個(gè)指令高速緩存還有一個(gè)LRU即最近不常用機(jī)制,因此,假如一個(gè)應(yīng)用軟件的轉(zhuǎn)移指令超過64條,最近常用的新指令將取代最近不常用的指令。這個(gè)架構(gòu)的優(yōu)點(diǎn)是,即便中斷服務(wù)處理程序被加速器覆蓋,這個(gè)機(jī)制仍然能夠支持各種轉(zhuǎn)移指令。
最常用的8行數(shù)據(jù)項(xiàng)目像高速指令緩存一樣,但是用于暫存最常用的數(shù)據(jù)庫(kù),可以使D-bus總線立即充滿數(shù)據(jù)。
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