1.Wuxi Hope Microelectronics Co.,， Ltd.， Wuxi 214035,， China,； 2.China Key System & Integrated Circuit Co.， Ltd.,， Wuxi 214072， China
Abstract： In order to meet the requirements of testing the long-term read and write performance of eMMC storage particles, an eMMC life verification design method is studied based on FPGA. Combined with eMMC working principle and high speed DDR（double rate）bus mode, the core components of verification system are designed in detail. FPGA（xc7a50tffgg484-1）is adopted as main control chip and four pieces of eMMC（FEMDRW064G-88A19）are selected as verification objects. The initial configuration method of eMMC is analyzed, and the module of open read and write is designed. With the control commands of the eMMC monitoring software, 180 000 times of loop read and write based on the blocks is completed. All the test results are passed, and the average read/write speed can reach 31 MB/s.
Key words : eMMC,；lifetime verification,；high speed DDR bus；FPGA
引言
eMMC（Embedded Multi Media Card）存儲(chǔ)顆粒以其尺寸小,、速度高,、易開發(fā)的特點(diǎn)[1]，非常適合用作嵌入式數(shù)據(jù)存儲(chǔ)介質(zhì),。用在機(jī)載記錄裝置時(shí),，實(shí)時(shí)記錄大量飛行圖像數(shù)據(jù)，待飛行結(jié)束后再將數(shù)據(jù)卸載回收,，提供給相關(guān)機(jī)構(gòu)進(jìn)行研究,。用在汽車駕駛輔助系統(tǒng)時(shí)，實(shí)時(shí)記錄視頻攝像頭,、激光測距器等探測的環(huán)境數(shù)據(jù),，經(jīng)過控制器運(yùn)算，做出行駛路徑的預(yù)測與規(guī)劃[2],。雖然eMMC具備壞塊管理能力,，但如果長時(shí)間高密度讀寫，會(huì)出現(xiàn)數(shù)據(jù)記錄出錯(cuò)情況,。在系統(tǒng)研發(fā)階段,，需提前驗(yàn)證其實(shí)際使用壽命，靠近壽損之前及時(shí)更換芯片,，以確保數(shù)據(jù)記錄無誤,。本文設(shè)計(jì)的eMMC壽命驗(yàn)證方法，使用FPGA作為讀寫eMMC的主控器,，可同時(shí)驗(yàn)證4片eMMC壽命,，硬件結(jié)構(gòu)簡單、通用性好,、觀測性強(qiáng),。
