日韩视频在线精品视频免费观看-日韩视频在线观看中字-日韩视频在线观看一区-日韩视频在线观看免费-日韩视频在线观看-日韩视频在线播放

產品分類

當前位置: 首頁 > 工業電子產品 > 半導體產品 > 微處理器MPU > Cortex

類型分類:
科普知識
數據分類:
Cortex

Which ARM Cortex CPU is Right for Your Next MCU-Based Application?

發布日期:2022-05-18 點擊率:110

       
ARM-based CPUs are ubiquitous in the MCU world and often there are several available from the same MCU supplier. Each ARM CPU has been optimized for a class of specific processing requirements, from low-end power-constrained applications to high-power performance-optimized, dual-core applications. The most popular ARM CPU today in MCU devices seems to be the Cortex CPU. How do you decide which ARM Cortex CPU is the right one for your application? Let’s explore the primary differences between some of the more popular Cortex-based MCUs by looking at example implementations that will help you decide which one is just right for your next design.

Many options

It’s not unusual to find many different ARM Cortex CPUs within a single MCU family. The Cortex CPU and its optional extensions address a variety of application needs, but all have backward-compatible instruction sets, as illustrated in Figure 1. Starting with the Cortex-M0/M0+/M1 family, the instruction set is targeted for general-purpose data processing and IO tasks. The Cortex-M3 CPU adds advanced-data processing and bit-field manipulation instructions that speed up more complex control and general-purpose computational tasks. The Cortex-M4 CPU adds Digital-Signal processing (DSP) instructions and offers Single-Instruction Multiple-Data (SIMD) operations where the same data-processing instruction can operate on multiple-data sources at the same time. These specialized capabilities can dramatically accelerate complex data-processing tasks, like those found in audio and video applications. The Cortex-M4 CPU can also add a Floating Point Unit (FPU) when performance and precision are both important elements for the target algorithm. Analog sensing and motor control, for example, often use floating point for its precision, but high performance is required for fast-control loop closure.

Image of ARM Cortex MCUs instruction set compatibility


Figure 1: ARM Cortex MCUs instruction set compatibility. (Courtesy of ARM and STMicroelectronics) 


One key advantage of this regular- and backward-compatible instruction set is that MCU manufacturers can create devices optimized for specific applications, while “covering all bets” by having upward compatibility if the algorithm grows in complexity during the lifetime of the target system. For example, how many times have you needed to add more complex functions in order to satisfy new requirements during development? The upward compatibility of the Cortex Instruction Set Architecture (ISA) makes this easy. In some cases it is possible to simplify the target architecture too, since downward compatibility allows you to reduce cost if lower performance is acceptable.

STMicroelectronics has used several ARM Cortex CPUs within its STM32 MCU family. Figure 2 illustrates the various Cortex CPUs and the key hardware features associated with each MCU series. Notice that the Cortex-M0 CPU is used on the entry-level STM32F030/50/051 devices while the Cortex-M4 with DSP and FPU is used on the high-performance STM32F4xx (such as the STM32F401RCT6) and STM32F3xx devices. The mid-range devices use the Cortex-M3 CPU where the more complex DSP and FPU instructions are not required to have the highest possible performance. (These instructions can be implemented with multiple instructions if needed and most compilers provide a fairly transparent method for switching between hardware implementations and multi-cycle “soft” implementations.)

Image of STMicroelectro<em></em>nics STM32F MCU family Cortex CPUs


Figure 2: STM32F MCU family Cortex CPUs and key hardware features. (Courtesy of STMicroelectronics) 


Other vendors also support multiple flavors of ARM Cortex MCUs, often over wide performance and cost ranges. Silicon Labs, for example, has the EFM32 family of MCUs (e.g., the EFM32ZG222F32-QFP48) that use the ARM Cortex-M CPU. The low-end low-power GZ series uses the Cortex-M0+ CPU while the mid-range TG, G, LG, and GG series use the Cortex-M3 CPU. The high-end WG series uses the Cortex-M4 CPU with DSP and FPU enhancements. There are 10 different package options making it possible, with a little up-front planning, to migrate from one CPU type to another, making it easier to adapt to changing requirements or to offer different products using the same base design.

The Cortex-A architecture

The Cortex-M architecture is a very popular one with MCU manufacturers, but the Cortex-A architecture is also showing up in vendors’ devices as well, often in MPUs, where large external memories are used for instructions and data. The Cortex-A CPU is optimized for very-high-performance applications, often with requirements for features like video playback and advanced security. The Atmel Cortex-A5-based SAMA5D4 MPUs, for example (Figure 3), use the Cortex-A5 CPU with a 2 x 32 kb Level 1 cache and a 128 kb Level 2 cache to speed processing performance. An on-chip DDR2/LPDDR/LPDDR2 controller accesses instructions and data from an external memory so very large programs and data sets can be used. Video processing algorithms, for instance, can require very large data sets and also very large programs. Hardware subsystems provide significant capabilities for security, connectivity, control, and user interfaces to simplify the creation of complex human machine interfaces and the associated control systems.

Image of Atmel SAMA5D4 MPU block diagram


Figure 3: Atmel SAMA5D4 MPU block diagram. (Courtesy of Atmel) 


The SAMA5D4 also supports two important Cortex extension functions – Trust Zone and NEON. Trust Zone supports secure code execution. Typically a processor needs to execute some security-related functions (such as secure PIN entry, or password protection) as well as some normal program functions (such as a graphic display or menu-selection routines). Trust Zone hardware extensions allow the programmer to protect security-related functions from normal accesses and potential security attacks. Even debug capabilities can be limited to just the normal program to further protect the secure routines from snooping and similar attacks.

The NEON extensions provide significant processing performance improvements for SIMD-based algorithms. Common targets for the NEON extension are multimedia, signal processing 2D/3D graphics, video encode/decode, and sound synthesis. NEON has its own independent pipeline and register file and can support signed/unsigned 8-, 16-, 32-, 64-bit, and single-precision floating-point operations on 32 registers that are treated as 64- or 128-bits wide depending on the instruction. NEON can typically provide a significant performance boost over non-SIMD implementations; a 60-150 percent performance boost on complex video codecs is a typical example.

Multi-core CPU solutions

ARM Cortex CPUs are also showing up in multi-core MCU implementations. These devices sometimes have two different performance CPUs, one very-high performance for the “heavy lifting” of the target application functions, and a slower-performance CPU for managing communications ports, user interfaces, and similar low-level control functions. Other multi-core devices have the same type of CPU, just replicated, to make it easy to partition and allocate less-specialized processing functions to achieve the right balance of processing and power efficiency. For example, one CPU could be put in a low-power wait state if it is not required to meet the performance requirement (perhaps during a “slow” data period) and then turned on when additional processing is required.

Texas Instruments, in its Concerto MCU family illustrated in Figure 4 (as an example see the F28M35H52C1RFPT) has added an ARM Cortex-M3 processor to its popular C28x CPU to provide an easy solution for both control and connectivity in a single device. The C28x CPU has been optimized for real-time control and it can leverage its 15+ years of DSP-application experience. The ARM Cortex-M3 CPU is optimized for communications applications and it can leverage the extensive ARM ecosystem for communications drivers (Ethernet, USB, CAN, SPI, etc.) as well as robust scheduling and O/S support.

Image of Texas Instruments dual CPU core Concerto? MCU family


Figure 4: Dual CPU Core Concerto? MCU family from Texas Instruments. (Courtesy of Texas Instruments) 


Matching your application to the right ARM Cortex CPU

You can find ARM Cortex CPUs in a wide variety of MCU families from just about every MCU manufacturer. In order to match the right Cortex CPU with your application you should start by determining which instruction set is the best fit for your application. In particular, look to see if advanced-data-processing capabilities like floating point or DSP are required. Do you need even more advanced features like NEON or Trust Zone? Perhaps your application is more control oriented and low power is a key requirement? If so, the simpler M0 architecture might be the right fit. Mid-range designs can take advantage of the Cortex-M3 CPU and select the device based on connectivity requirements and other key peripherals – you typically have the most choice in mid-range devices from your MCU manufacturer.

If your requirements change during the design phase you may want to be able to migrate to a more feature-rich device or to a more feature-lean device. In this case it may be important to select an MCU family that supports easy migration between devices. You can also use the large ARM Cortex ecosystem to leverage proven drivers, an RTOS, function-specific libraries and development-tool chains. No matter what ARM Cortex CPU you select you can be sure there will be a robust ecosystem available to simplify your design.

For more information on the parts discussed in this article, use the links provided to access product pages on the Digi-Key website.

下一篇: 斷路器、隔離開關、接

上一篇: 索爾維全系列Solef?PV

推薦產品

更多
主站蜘蛛池模板: 久久夜色精品国产欧美一区麻豆 | 邻居少妇张开腿让我爽视频 | 午夜精品久久久久久99热软件 | 亚洲精品乱码久久久久久按摩 | 国产精品伦一区二区在线 | 日一日射一射 | 亚洲天堂免费在线观看视频 | 影音先锋天堂网 | 天天干一干 | 欧美美女一区二区三区 | 强奷乱码中文字幕 | 秋霞午夜鲁丝一区二区老狼 | 中文字幕乱码一区av久久不卡 | 国产精品99久久久久 | 国产精品爽爽久久久久久 | 淫片一级国产 | 亚洲欧美在线视频观看 | 日韩香蕉视频 | 国产精品久久久久久久久久98 | 99国产精品久久久 | 亚洲偷自拍另类图片二区 | 大桥未久av在线 | 欧美在线视频播放 | 超碰色人阁 | 国产偷人妻精品一区二区在线 | 韩国三级hd中文字幕叫床浴室 | 在线免费观看av的网站 | 久久久www成人免费毛片女 | 日韩在线观看你懂的 | 天天弄 | 色版视频 | 亚洲.www| 色婷婷综合在线 | 精品国产av色一区二区深夜久久 | 亚洲最大成人综合网 | 欧美一区二区网站 | 邻居少妇张开双腿让我爽一夜 | 69精品视频 | 靴奴—视频丨vk | 福利社91| 深夜福利在线观看视频 | 日韩免费精品视频 | а√天堂资源中文在线官网九色 | 日韩成人福利 | 成人日韩在线观看 | 亚洲蜜臀av乱码久久精品蜜桃 | 十八岁污网站在线观看 | 欧美午夜在线 | 国产精品沙发午睡系列990531 | 韩国少妇bbb毛毛片 韩国少妇xxxx搡xxxx搡 | 中文字幕乱码人妻一区二区三区 | 在线草 | 国产日韩在线观看一区 | 日韩中文无| 超碰爱爱 | 夜夜嗨一区二区 | 777777777少妇流水视频 | 三级在线视频 | 久久99国产综合精品 | 国产永久免费无遮挡 | 男人免费视频 | av永久天堂一区二区三区 | 中文天堂在线资源 | 美腿丝袜高跟三级视频 | 亚洲 中文 欧美 日韩 在线 | 中文字幕一区二区人妻性色 | 国产区亚洲区 | 中国极品少妇xxxx做受 | 欧美又大又硬又粗bbbbb | 黑人性较视频免费视频 | 一区二区三区四区蜜桃 | 91精品国产乱码久久久竹菊 | 97人人模人人爽人人少妇 | 久久久免费看片 | 台湾绝版午夜裸体写真秀 | 午夜精品久久久久久久久久蜜桃 | 国产sm调教视频在线观看 | 国产女主播喷出白浆视频 | 天天躁日日躁狠狠躁欧美老牛 | 中文字幕在线视频一区二区三区 | 51成人做爰www免费看网站 | 女人下边被添全过视频 | 日韩亚洲一区二区三区 | 日韩欧美亚洲在线 | 一本色道无码道dvd在线观看 | www.激情网| 国产老头与老太xxxxx看看吧 | 国产精品无码一区二区三区 | 99热在线这里只有精品 | 明神亚贵在线免费观看 | 精品国产一区二区三区性色av | 国产成人无码一二三区视频 | 激情综合婷婷 | 午夜爱爱福利 | 美女野外找人搭讪啪啪 | 日本熟女毛茸茸 | 亚洲男人第一av网站 | 日韩精品在线第一页 | 国产精品二区一区二区aⅴ污介绍 | www91免费视频| 欧美成人片一区二区三区 | 蜜桃啪啪 | 日本在线一区二区 | 亚洲成熟少妇视频在线观看 | 国产精品无码不卡一区二区三区 | 偷拍夫妻性生活 | 男人的天堂在线视频 | 精品欧美一区免费观看α√ | 亚洲国产精品va在线看黑人 | 十八禁无码免费网站 | 体内精69xxxxxx | 国产精品爽爽爽爽爽爽在线观看 | 一区二区三区视频免费 | 老女人任你躁久久久久久老妇 | 日韩在线精品成人av在线 | 狠狠色婷婷丁香综合久久韩国 | 在线一区二区三区 | 最新精品在线 | 亚洲精品国产av成拍色拍 | 人体做爰aaaa免费 | 波多野结衣在线视频免费观看 | 成人精品免费在线观看 | 十八18禁国产精品www | 性折磨bdsm虐乳欧美激情另类 | 关秀媚三级露全乳视频 | 美女性生活视频 | 国产精品美女一区二区 | 伊人久久久久久久久久久久久 | 亚洲精品成人av在线观看爽翻天 | 中文久久乱码一区二区 | www97超碰| 日韩视频在线观看一区 | 无码免费一区二区三区 | 久久国产精品久久久久久久久久 | 亚洲人亚洲人成电影网站色 | 国产视频97 | 男女裸体无遮挡做爰 | 欧美爱爱视频 | 亚洲另类伦春色综合妖色成人网 | 日韩av无码免费播放 | 国产午夜精品一区二区三区嫩草 | 成人午夜又粗又硬又长 | caoporm超碰国产精品 | 真实的国产乱xxxx在线91 | 少妇伦子伦情品无吗 | 中文字幕一区二区三区四区久久 | 欧美久久久久久久久久久 | 成年人激情网 | 精品少妇久久久久久888优播 | 在线视频欧美日韩 | 亚洲欧美综合精品久久成人网无毒不卡 | 色伊人影院 | 无码人妻精一区二区三区 | 艳情五月| 丰满女人与性猛交视频 | 亚洲天码中字 | 日本少妇做爰全过程毛片 | www.激情五月.com | 午夜国产一级片 | 欧洲av片 | 999久久欧美人妻一区二区 | 久久久久久久久久久国产 | 国产男女无套 | av无码av天天av天天爽 | 国产精品视频网址 | 中文不卡视频 | 97精品在线视频 | 日本免费高清一本视频 | 97色碰碰公开视频 | 亚洲综合网国产精品一区 | 水蜜桃一二三区 | 中文字幕日韩专区 | 亚洲国产日韩av | 亚洲精品v日韩精品 | 国产成人综合色在线观看网站 | 精品国产成人av在线免 | 日本视频www | av免播放器在线观看 | 天天躁夜夜躁狠狠眼泪 | 国产精品高潮呻吟久久av无 | 91久久国产露脸精品国产闺蜜 | 影院一区 | 青青草视频播放 | 伊人久久青青草 | 国产91在线高潮白浆在线观看 | 成人久久大片91含羞草 | 亚洲午夜国产 | 高清精品一区二区三区 | 日韩av无码中文无码电影 | 欧美精品久久久久久久久久久 | 无码国模国产在线观看 | 国产成人免费视频精品含羞草妖精 | 日本a视频在线观看 | 国产一区二区欧美 | 草草夜色精品国产噜噜竹菊 | 我们的2018在线观看免费高清 | 99久久无色码中文字幕人妻 | 色哒哒影院 | 夜精品a片一区二区三区无码白浆 | 日韩亚洲一区二区三区 | 日本特黄特黄刺激大片 | 欧美精品久久久久久久久老牛影院 | 日韩一级黄色大片 | 91丨国产丨捆绑调教 | 国内精品视频一区二区三区 | 疯狂做受xxxx欧美肥白少妇 | 久久夜色精品国产噜噜av小说 | 亚洲人成777 | 一级一级特黄女人精品毛片 | 亚洲四区在线 | 欧美精品xxxxx| 国产亚洲日韩av在线播放不卡 | 丝袜视频一区 | 国产成人精品无码一区二区 | 免费观看理伦片在线播放 | 精品三级视频 | 亚洲国产精品久久久久 | 国产精品伦视频看免费三 | 亚洲伊人网站 | 女人毛片av | 狠狠色网 | 日本黄色片段 | 欧美一级黄色片在线观看 | 欧州一区二区三区 | 女女同性女同一区二区三区九色 | 国产精品久久久久久久久久99 | 黄色特级视频 | 色嗨嗨av一区二区三区 | 欧美3p两根一起进高清免费视频 | 色天天干 | 久久久久青草线综合超碰 | 国产最新进精品视频 | 在线播放av片 | 国产女s调教男m免费网站 | 一区二区三区视频免费看 | 日日干夜夜草 | 麻麻张开腿让我爽了一夜 | 91n视频| 91精品国产乱码久久久久久久久 | 免费国产黄网站在线观看可以下载 | 98国产精品综合一区二区三区 | 女人舌吻男人茎视频 | 国产欧美日韩小视频 | 日本激情吻胸吃奶呻吟视频 | 亚州福利 | 成人免费乱码大片a毛片软件 | 潮喷大喷水系列无码久久精品 | 18禁免费观看网站 | 91在线免费视频观看 | a级片在线免费观看 | 欧美性大战久久久久久 | 一二三四日本高清社区5 | 国产又白又嫩又紧又爽18p | 日本va欧美va精品发布 | 国产精品xnxxcom | 91成人免费观看 | 国产视频一区二区在线播放 | 成年男人裸j网站 | 中国性受xxxx免费 | 波多野结衣av无码久久一区 | 日韩一二三区在线观看 | 羞羞的网站在线观看 | 国产精品丝袜高跟鞋 | 国产精品亚洲一区二区三区喷水 | 国产精品久久久久久久久久妇女 | 欧美在线免费观看 | 欧日韩不卡视频 | 国产真实老熟女无套内射 | 西方裸体在线观看 | 2025av在线播放 | 日韩精品视频在线播放 | 日韩美女免费视频 | 少妇的丰满3中文字幕 | 国产成人精品一区二区秒拍 | 亚洲色成人中文字幕网站 | 色欲色av免费观看 | 日本理伦片午夜理伦片 | 亚洲精品女人 | 少妇人妻无码永久免费视频 | 伊人久艹 | 成人深夜小视频 | 国产精品久久久久久人妻精品动漫 | 日本天天操 | 国产干干干| 亚洲综合精品一区二区三区 | 日韩激情综合 | 亚洲日韩久久综合中文字幕 | 毛片基地免费观看 | 视频一区二区欧美 | 成人动漫在线免费观看 | 国产乱淫av片免费 | 亚洲精品一区二区三区蜜桃久 | 国产亚洲精品久久久久四川人 | 成人午夜视频免费观看 | 5a级毛片 | 国产色播av在线 | 色www国产亚洲阿娇 色爱av综合 | 久久99亚洲精品久久99果 | 久久网中文字幕日韩精品专区四季 | 极品女神无套呻吟啪啪 | 亚洲 精品 主播 自拍 | 在线观看国产精品视频 | 8×8x8×8人成免费视频 | 精品国产精品一区二区夜夜嗨 | 99精品视频免费 | 视频福利在线 | 狠狠色综合网站久久久久久久 | 久久久人成影片一区二区三区 | 性猛交xxxxx按摩中国 | 我要看免费黄色片 | 无码吃奶揉捏奶头高潮视频 | 狠狠躁日日躁夜夜躁影院 | av无码精品一区二区三区四区 | 日日摸日日添日日碰9学生露脸 | 黄色片在线 | www91麻豆 | 狠狠色噜噜狠狠狠狠av不卡 | 国产亚洲美女精品久久久2020 | 亚洲天堂网在线观看视频 | 国内三级在线 | 成人av男人的天堂 | 综合激情亚洲丁香社区 | sm国产在线调教视频 | 中文无码av一区二区三区 | 中文字幕日韩在线观看 | 欧美日韩国产麻豆 | 风流僵尸艳片a级 | 少妇裸体淫交免费视频网站 | 欧美最猛黑人xxxx黑人猛交 | 99av国产精品欲麻豆 | 亚洲欧美在线视频免费 | 亚洲香蕉av在线一区二区三区 | 男女啪啪做爰高潮无遮挡 | 中文不卡在线 | 激情视频国产 | 国产一区在线免费观看 | 欧美日韩在线中文字幕 | 国产精品18久久久 | 久久综合九色综合欧洲98 | 巨乳美女在线 | 制服.丝袜.亚洲.中文.综合懂色 | 欧美成人性影院 | 亚洲国产欧美自拍 | 奶头挺立呻吟高潮视频 | 国产午夜精品福利视频 | 成人高清视频免费观看 | 国产无遮挡吃胸膜奶免费看 | 免费黄色短片 | 日韩av手机在线 | 骚五月| 国产激情免费 | 成人精品一区二区三区视频播放 | 亚洲国产中文在线 | 日本丰满熟妇videossexhd 午夜福利影院私人爽爽 | 日本高清视频色wwwwww色 | 国产又白又嫩又爽又黄 | 精品久久久久久无码人妻 | 真多人做人爱视频高清免费 | 国产欧美综合一区二区三区 | 丰满人妻一区二区三区免费视频 | 亚洲国产精品无码av | 亚洲a无码综合a国产av中文 | 6080yyy午夜理论片中无码 | 国产精品黄在线观看免费软件 | 国产精品久久久久久无毒不卡 | 女教师交换乱淫 | 黄色av网| 久久国产精品99精国产 | 91丨九色丨国产在线观看 | 亚洲国产精品婷婷 | 催眠调教后宫乱淫校园 | 国产亚洲欧美在线 | 亚洲男男网站 | 人人干免费 | 99国产精品久久久久久久日本竹 | 免费看美女被靠到爽的视频 | 日产国产亚洲精品系列 | 综合色区亚洲熟妇另类 | 中文字幕一区二区三区人妻少妇 | 日韩欧美在线视频免费观看 | 国产精品久久一区性色av图片 | 日韩精品在线观看网站 | 日本熟妇hdsex视频 | 日韩在线免费视频观看 | 国产精品久久久久久久妇女 | 国产成人精品无码短视频 | 天天综合干 | 国产精品久久久久9999高清 | 香蕉久久一区二区不卡无毒影院 | 日韩精品久久久久久久酒店 | 成人小视频在线观看 | 99热导航| 甄宓高h荡肉呻吟np 正在播放国产老头老太色公园 | 男女猛烈xx00免费视频试看 | 福利小视频在线观看 | 91偷拍精品一区二区三区 | 色屁屁www | 99爱免费| 成人欧美日韩一区二区三区 | 一区精品在线 | 国产成人精品亚洲午夜麻豆 | 99操| 好了av四色综合网站 | 色爱综合 | 国产精品太长太粗太大视频 | 四虎色视频 | 久久撸视频 | 九九影院最新理论片 | 性与爱午夜视频免费看 | 国产精品白浆一区二小说 | 综合自拍亚洲综合图区高清 | 少妇人妻无码永久免费视频 | 中文字幕在线观看线人 | 欧美综合视频在线 | 2020无码专区人妻系列日韩 | 久久久免费看 | √天堂资源在线中文最新版 | 无码人妻av一二区二区三区 | 黄色网免费看 | 67194国产| 亚洲视频网站在线观看 | 欧美激情婷婷 | 国产超碰在线观看 | 国产精品一区二区三 | xxx毛片| 欧美色欧美亚洲高清在线视频 | 美女胸18大禁视频网站 | 调教性瘾双性高清冷美人 | 熟妇高潮一区二区三区 | 狼人社区91国产精品 | 亚洲视频一区在线观看 | 欧美色插 | 污视频网站在线 | 亚洲老妈激情一区二区三区 | 九九影院最新理论片 | 风韵丰满熟妇啪啪区老老熟妇 | 人人玩人人添人人澡超碰 | 香蕉视频黄在线观看 | 女人的精水喷出来视频 | 视频在线一区二区 | 亚洲欧美日韩在线不卡 | 日本中文字幕第一页 | 伊人导航 | 午夜av网址 | 激情综合激情五月俺也去 | 成人在线观看亚洲 | 四川丰满少妇毛片新婚之夜 | 成人免费毛片明星色大师 | 成人动漫在线播放 | 成人免费看吃奶视频网站 | 亚洲欧美综合视频 | 色婷婷5月天 | 欧美精品乱码99久久影院 | 日日碰狠狠添天天爽超碰97 | 密桃成熟时在线观看 | 日本午夜免费福利视频 | 粉嫩粉嫩一区性色av片 | 成年性生交大片免费看 | 国产精品秘入口18禁麻豆免会员 | 私色综合网 | 日韩不卡在线观看 | 日韩美女亚洲99久久二区 | 国产一级做a爱片 | 天天综合久久综合 | 国产农村妇女毛片精品 | 亚洲精品久久久久久久蜜桃 | 久久久久久久久久影院 | 91精品国产日韩91久久久久久360 | 日本久久爱 | 女人14毛片毛片毛片毛片区二 | 日韩 欧美 综合 | 国产一级做a爰片在线看免费 | 久久久一级黄色片 | 色噜噜狠狠色综合成人网 | 国产伦精品一区二区三区免费迷 | 好男人中文资源在线观看 | 久操视频在线播放 | 欧美艹逼视频 | 亚洲精品乱码久久久久久按摩 | 少妇浴室精油按摩2 | 国产一级淫片a直接免费看 国产一级淫片免费放大片 国产一级影院 | 日韩一级淫片 | 欧美jizz18 | 小镇姑娘国语版在线观看免费 | 日本少妇色 | 国产福利99 | 27美女少妇洗澡偷拍 | jzzijzzij亚洲成熟少妇18 jzzijzzij亚洲农村妇女 | 偷拍一区二区三区在线婷婷 | 五月丁香色综合久久4438 | 久久精品亚洲国产奇米99 | 久热在线中文字幕色999舞 | 一级aaa毛片| 久久伊人色av天堂九九小黄鸭 | 91久久嫩草影院一区二区 | 999精品嫩草久久久久久99 | 午夜看毛片 | 国产精品 视频一区 二区三区 | 丰满双乳峰白嫩少妇视频 | 日韩欧美一区二区三区四区 | 欧美精品网 | 黄色av一区 | 超h高h肉h文教室学长男男视频 | 亚洲欧美综合网 | 伊人久久噜噜噜躁狠狠躁 | 国产成人手机视频 | 中文字幕乱码熟妇五十中出 | 亚洲精品国产一区二区精华液 | 九九精品视频在线观看 | 国产精品久久久久影院嫩草 | 欧美午夜激情影院 | 久久人人爽人人爽人人片av高清 | 女同av亚洲女人天堂 | 国产精品点击进入在线影院高清 | 丰满肥臀大屁股熟妇激情视频 | 午夜看片在线 | 色屁屁www影院入口免费 | 亚洲第一天堂无码专区 | 国产成人午夜福利在线观看 | 蜜桃色一区二区三区 | 精品国产乱码久久久久久虫虫 | 极品少妇一区二区三区 | 哪里看毛片 | 欧美性视频一区二区 | 小蜜蜂www视频在线观看高清 | 99久久精品国产一区二区三区 | 国产怡红院 | 男人猛躁进女人免费视频夜月 | 亚洲精品久久久中文字幕痴女 | heyzo久久| 亚洲精品丝袜字幕一区 | 久久人妖 | 亚洲视频自拍偷拍 | 亚洲不卡免费视频 | 成人午夜黄色 | www.68av蜜桃亚洲精品 | 久久精品夜色噜噜亚洲a∨ 国产精品人人做人人爽 | 亚洲欧美激情另类校园 | 不卡三区| 牛鞭伸入女人下身的真视频 | 国产又粗又硬又大爽黄 | 三级黄色片网站 | 国产影视一区 | 人成免费在线视频 | 国产 欧美 视频一区二区三区 | 国产一级一级片 | 国产精品高潮呻吟久久av免费动漫 | 777精品国产乱码久777 | 久久久欧美精品sm网站 | 在线看av网址 | 2020自拍偷拍| 四虎永久在线精品免费网站 | 真实亲伦对白清晰在线播放 | 88av网| 91久久夜色精品国产网站 | 一级生活毛片 | 97国产精品欲 | 91九色丨porny丨肉丝 | 亚洲欧美国产精品专区久久 | 九九热这里只有精品6 | 亚洲国产成人一区二区精品区 | 女人裸体偷拍全过程 | 性久久久久久久久久久久 | 日本乱人伦片中文三区 | 男女av在线 | 精品国产老女人乱码 | 日韩欧美自拍 | 无码人妻黑人中文字幕 | 国产精品国产三级国产专区53 | 日本国产乱弄免费视频 | 中国女人真人一级毛片 | 我和岳疯狂性做爰全过程视频 | 午夜精品久久久久久久99热浪潮 | av在线播放一区 | 永久免费看片在线播放 | 亚洲资源av无码日韩av无码 | 69久久夜色精品国产69蝌蚪网 | 狠狠操狠狠色 | 亚洲欧美日韩国产成人精品 | 日日噜噜夜夜狠狠 | 一久久久久 | 亚州av久久精品美女模特图片 | 玖草影院| 色老头在线一区二区三区 | 国产乱对白刺激视频 | 久久狠狠一本精品综合网 | 在线网站免费观看入口 | 女人精69xxxⅹxx视频 | 四虎影在永久在线观看 | 国产美女在线观看免费 | 中文字幕成人在线视频 | 亚洲国产一区二区三区四区 | 天天干天天综合 | 国产精品99久久久久久人 | 91精品国产91久久久久福利 | 伦为伦xxxx国语对白 | 无码国产精品一区二区免费i6 | 国产成人亚洲综合青青 | 熟妇人妻无乱码中文字幕 | 在线天堂√8 | 欧美一进一出抽搐大尺度视频 | 天堂网www在线资源网 | 昭和冢本农村中文字幕 | 少妇丰满尤物大尺度写真 | 免费啊v在线观看 | 欧美激情 国产精品 | 91麻豆精品久久久久蜜臀 | 少妇性色av | 亚洲精品国偷拍自产在线观看 | 国产成人三级一区二区在线观看一 | 亚洲人色婷婷成人网站在线观看 | 黑人添美女bbb添高潮了 | 色屁屁ts人妖系列二区 | 欧美又粗又深又猛又爽啪啪九色 | 久久久久久影视 |