君正T21和T31的区别？接下来有北京君正代理商小编来介绍一下它们的区别在哪里。
君正T21，采用28nm工艺，主频高达900MHz, BGA封装，君正T21是更经济型的SOC，广泛用于摇头机，枪机，球机等产品上，极致型200万像素编码处理器，Smart H.264编码引擎，超低码流控制，BOM成本控制，低功耗技术，内置以太网PHY。
| CPU | XBurst single core, up to 1GHz. 16KB L1 I-cache and 16KB L1 D-cache. 64KB L2 unified cache. Hardware floating point unit. |
| Encoder engine | H.264 high profile Smart H.264 features MJPEG/JPEG Baseline |
| Encoder Performance | Max resolution 2048*2048 Up to H.264 1080P@60fps encode H.264 multiple streams: 1080P@30fps+D1@30fps+JPEG@15fps ABR/VBR/CBR/CQP 8 ROIs, 5-layer OSD with hardware |
| ISP | AE, AWB, AF Lens shading correction Advanced spatial noise reduction Motion-adaptive temporal noise reduction (3D de-noise) Multi-exposure HDR image fusion (WDR) Space-variant HDR processing Host tuning tools |
| Memory | Capacity of 512Mbit and 1Gbit |
| Computer Vision | Motion Detection/Perimeter Protection Face Detection Human Detection Dynamic Tracker |
| Video Input | Supports 8/10/12-bit parallel input |
| Audio | Integrated 92dB audio codec AAC, G726, G711, PCM encoding Echo cancellation |
| Connectivity & Peripherals |
POR, RTC, WDT, ADC, UART, I2C, SPI, GPIO, SDIO, PWM, USB-OTG, EMAC，ETH-PHY AES/DES/3DES |
| Physical Feature | Typical less than 400mW power consumption including DDRII TFBGA152 ROHS, ball pitch of 0.65mm,body size of 9mmx9mm |
君正T31系列芯片相比前代而言做出了全面的升级，支持H.265/H.264主频高达1.5GHz，采用的是22nm工艺，QFN/BGA多种封装，功耗极低，T31(H.265+AI)全能均衡视频处理器，星光增强级ISP，支持5M@30fps HEVC视频编码，超低码流，可快速落地轻智AI算法，更加先进的工艺，利于产品的丰富拓展接口。
北京君正T31系列芯片支持500万分辨率实时视频，支持快速启动，支持人形侦测、人脸侦测/识别、哭声侦测、车辆侦测、动物侦测等丰富算法，极大的扩展了搭载设备的应用场景。
| CPU | Ultra high frequency, up to 1.5GHz . Vector Deep Learning accelerator base on SIMD128 64KB + 128KB L1/L2 Cache RiscV independent lite core |
| Video Encoder |
H.264/H.265/MJPEG encoder Maximum 2592*1920@30fps World class advanced encoder engine Support multiple streaming and various features |
| Starlight ISP | Dedicated optimizations for low light and surveillance scenarios Upgraded 2D / 3D noise reduction Sharpening enhancement, ROI-AE Advanced WDR, DRC Distortion correction |
| Memory | Capacity of 512Mbit or 1Gbit |
| Security | AES/RSA/SHA/TRNG/OTP Support secure boot |
| AI algorithm | Support deep learning algorithm with high precise and good flexibility Human detection, Facial detection/recognition Cry detection, Vehicle detection, Pets detection |
| Package | 22nm process Package：QFN / BGA |
| Fast Boot | Support Fast Boot - Dual boot - Fast AE / AWB - ~200ms stable video output |
| Wide extension | Support 4-channel digital MIC array Support IoT-WIFI / BT / 4 Support SLCD Display Support UVC / UAC |
| Audio | Integrated Audio Codec Support Rate 8K/12K/16K/24K/32/44.1K/48K/96K Support I2S Interface Echo cancellation |
| Connectivity & Peripherals |
WDT, ADC, UART, I2C, SPI, GPIO, SDIO, PWM, USB-OTG, GMAC |
北京君正代理商，还有更多精彩文章分享《君正T30开发指南，君正原厂开发资料》《君正T30Z所生产的360门铃》
