【经验】serdes芯片技术总结
在无延时高清摄像头视频传输过程中,GMSL技术应用广泛,对应的有某厂家的Clockless-BD技术,而瑞萨有AHL模拟高清技术,类似的国产瑞盟科技,天津瑞发科的低频压缩低延时传输技术都是高清摄像头视频传输技术,本文主要总结市场中广泛使用的GMSL,以及ROHM的Clockless-BD技术,以及瑞萨AHL芯片。GMSL可以总结为如下芯片:
GMSL串行器-解串器
上图中GMSL目前分为GMSL1以及GMSL2,其中部分GMSL2产品兼容GMSL1。
MAX9296解串器,既可以接入MAX96701(GMSL1)也可以接入MAX96717(GMSL2);
MAX9295A串行器,既可以接入MAX9286(GMSL1),也可以接入MAX96712(GMSL2);
除此以上可以兼容的,GMSL1与GMSL2之间无法互接。
最大为6Gbps的带宽,可以传4K@30P,最小的为1.76Gbps对应的1M@60P,中间档3Gbps带宽对应2M@60P。
而Clockless-BD摄像头SERDES芯片如下:
Clockless-BD的方案主要为2M@60P,带宽为3.6Gbps。另外瑞萨的AHL,也是最大2M@30P的传输能力:
从以上3类高清摄像头视频传输方案可以看到高于2M@60P以上,GMSL可以提供对应的TX,RX芯片,但是在4K@60P以上的方案上暂时没有,而在2M以下方案中,由于AHL采用低成本非屏蔽双绞线,以及普通的接插件就可以完美传输视频,而GMSL,Clockless-BD都需要车载同轴线,以及抗干扰的接插件才能实现视频完整传输,从性价比上评估AHL更有优势,而在设计调试过程中,几种方案基本都是对寄存器的配置来适配就可出图,但是要实现完美的图像效果,还需要做颜色的tuning工作。
在实际客户端调试AHL时,需要注意当原理图设计中的RX端隔离电阻没有设计时,往往出现波形幅度较大,需要加上电阻;同时需要用示波器测量输入的AHL信号波形:
客户端调试实际波形如下:
基本已经符合AHL模拟高清的波形结构,同步信号,color burst,以及有效的视频数据都完整测量到了,这个时候说明摄像头TX端基本已经正常工作
下一步需要做的是配置RX端来适配TX端的波形,比如以上波形为720P@60P的分辨率,我们在RX端的寄存器配置也需要设置为720P@60P,并且对应的时钟需要设置为148.5MHZ,这样才能完成720P@60P数据采样,这样就完成了AHL的TX与RX的适配调试,当然AHL也可以与AHD,CVI,TVI等模拟高清适配工作。
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型号- ISL78010,RH850/F1L,R-CAR V3X,DA9214-A,RBA250N10,RL78/F23,RL78/F24,SLG46620-A,NP75N04YUK,R-CAR V4H,ZSSC417X,DA16600MOD,RXRAA279972,R-CAR E3,RH850/F1X,NP90N04VLK,5P49V60,RL78/F1X,DA7280-A,R-CAR M3N,RH850/D1M1A,ANL3,U2A16,RH850/P1X,ANL2,R-CAR D SERIES,R-CAR H SERIES,RL78 SERIES,NP20P06SLG,UPD166031A,RH850 / F1X,RH850/C,ISL78714,ISL78264,RBA160N04AHPF,RAA271005,RAA271000,R-CAR S4,RH850/U2A16,TXRAA279971,SERIES,NP100N04PUK,RH850,UPD166027,RL78/15,RL78/G23-64P,RAJ2800034,RH850/P1M,ISL78215,RH850/F1KM-S1,HS4011,5P49V60A,ΜPC842A,DA7280,DA9224-A,RAJ2800024,PR-INV06500780-FB,RTKA279971ZB0000BU,RTK7RLG230CLG000BJ,RAA278840,RAA270005KFP,RAA278842,ISL78206,ISL78208,ISL78322,RL78,ISL78444,TW8847,TW8846,RAA270005,NP109N04PUK,ISL78233,ISL1208,NP89N04PUK,R-CAR H3,RAA270000,R-CAR E SERIES,DA9213-A,R-CAR M SERIES,RAA279940,NP89N04PDK,NP50N04YUK,ISL78234,ISL78235,ISL78236,UPD166027T1J,RH850 / D1M1A,RAA270000KFT,R-CAR V3U,DA728X,RAJ2800044,RL78/F13,RL78/F14,R-CAR V3M,IPS2550,R-CAR V3H,P9261-3C,TW884X,ISL78224,UPD166033T1U,ISL78226,RH850 / F1KM-S1,RJQ7031,NP75N04YLG,ISL78714XB-EVKIT1Z,NP90N04VDK,ISL78419,RH850/C系列,RBA250N10CHPF-4UA02,RTK7F124FGS00000BJ,DA9063L,TW99XX,ISL799XX,RH850 U2X,NP90N04VUK,DA9063A,NP75N04YUKX6,XLH335006.005284K,RL78 / F1X,ISL78083,R-CAR S SERIES,DA14531,ANL3 SERIES,RAA279971,RAA279972,R-CAR M3,RV1S2752Q,RAA2788XX,TW88XX,RAA270205,ISL78310,RH850/D1M1-A,RA A271000,DA9223A,SLG46827-A,ISL81601,RH850/C1M-A2,RH850/C1M-A1,RH850-P1M,RAA2799XX,RJU7032,RH850/CM-AX,ZSSC4132,ISL78434,ISL78420,DA9224A,DA9223-A,RAA271082,RH850/F1KM,RH850/C1X,9FGV0841,ISL78307,ISL78301,ISL78424,NP180N04TUK,ISL78171,RBA250N04AHPF,RH850/C1M-AX,RH850/U2X,ZMOD4510,ISL78714BMS5XBEKIT1Z,R2A25110,IW7039-A,NP110N04PUK,ZSSC3170,RH850F1KM-S1,DA9063-A,RTK7F70169S00000BJ,R-CAR S,RAA271050,DA16200,RH850/P1M-E,RH850/U2AX,UPD166033,UPD166034,SLG46855-A,RAA2778842,ISL12022,ISL78434X3,RAA2778843,RAA2778840,UPD166031,UPD166032,R-CARS4,R-CAR V SERIES,5P35023,5P35021,ZMOD4410,NP15P04SLG,UPC842AMP,RAA271041,ANL2 SERIES,RH850/E1X,RH850/U2BX,UPD166029,ISL76683,RH850/U2A,ZSSC4165
AS244 R-CAR V3H VIDEO OUTPUT EXPANSION SOLUTION FOR SURROUND VIEW & AR-HUD
型号- RAA271082A4HNP#HA0,R-CAR M3E-2G,TW8847-LA1-CE,RAA271050,RAA271082A4HNP#AA0,5P35021-000NDGI,TW8846-LA1-CE,R-CAR M3E,RAA279971D3HNP#AA0,R8A77980,SLG46827-AG,R-CAR V3H,RAA279972C3HNP#AA0,5P35021,RAA271000A4HBG#AC0,RAA278840B3HFP#AA0,RAA271000,RAA271082,RAA279971,RAA278840,RAA279972,R8A77980A,5P35021-000NDG2,5P35021B-000NDGI,RAA271082A4HNP#MA0,TW8847,TW8846
New Automotive High-Definition Link Lowers High-Definition Camera System Costs
To facilitate a cost-effective camera implementation in the vehicle, Renesas designed a technology which leverages the low-cost infrastructure used in traditional analog SD camera systems, while providing the picture quality and higher resolutions desired in today’s applications. AHL supports MIPI-CSI2, DVP, and BT.656 interfaces as inputs on the RAA279971, and as outputs on the RAA279972. It transmits excellent video quality at distances up to 30 meters with multiple in-line connectors. Renesas has user friendly evaluation boards, application notes, and IC samples available upon request.
新产品 发布时间 : 2021-08-19
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