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ADV7511W 读不到EDID

Question asked by Yuandengchao on Dec 29, 2017
Latest reply on Dec 29, 2017 by JeyasudhaMuthuPerumal

hello@ADI工程师:

         在当前的项目中使用AVD7511作为HDMI source,通过FPGA产生图像输入信号,参考了http://www.analog.com/media/en/technical-documentation/application-notes/AN-1270.pdf,7511配置也参考了该文档,

72 01 00 ; Set N Value(6144)
72 02 18 ; Set N Value(6144)
72 03 00 ; Set N Value(6144)
72 15 00 ; Input 444 (RGB or YCrCb) with Separate Syncs
72 16 61 ; 44.1kHz fs, YPrPb 444
72 18 46 ; CSC disabled
72 40 80 ; General Control Packet Enable
72 41 10 ; Power Down control
72 48 48 ; Reverse bus, Data right justified
72 48 A8 ; Set Dither_mode - 12-to-10 bit
72 4C 06 ; 12 bit Output
72 55 00 ; Set RGB444 in AVinfo Frame
72 55 08 ; Set active format Aspect
72 96 20 ; HPD Interrupt clear
72 98 03 ; ADI required Write
72 98 02 ; ADI required Write
72 9C 30 ; ADI required Write
72 9D 61 ; Set clock divide
72 A2 A4 ; ADI required Write
72 43 A4 ; ADI required Write
72 AF 16 ; Set HDMI Mode
72 BA 60 ; No clock delay
72 DE 9C ; ADI required write
72 E4 60 ; ADI required Write
72 FA 7D ; Nbr of times to search for good phase

显示器是DVI;一直没有图像输出,但显示器会时不时的亮起来,提示“无信号输入”;并且一直都读不到EDID

都下列寄存器返回值:

addr 0x42 readOut 0x50
addr 0x96 readOut 0xf0
addr 0x97 readOut 0x0
DDC 0xC8 readOut 0x1

 问题:

会是什么原因都不到EDID?

 

麻烦各位调试过该芯片的工程提供相关建议,谢谢!!!!

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