AD9889B and 1080p60 problem

Hello,

I am using an AD9889B,sucessfully transmitting 720p60 and 480p60 signals.

Now I tried to transmit 1080p60.

AD9889B corrently recognizes the mode that I send to it by reading these registers(R0x3D=0x10,R0x41=0xF8,R0x42=0x10,all circuits powered up and Hot plug active),but the display is black.I've tried many diffrent displays(samsung and others),all displays are black.

I modify R0xA2 and R0xA3 to 0X87,and change the timing sequence following EIA-CEA-861-D(verified with a scope),and using videoclock of 148.5MHz,but it's not working.

I've tried 1280*768 60Hz too,the videoclock of 108MHz,the display is sign good and black from time to time.

I am not using HDCP.

Any other regiter must be modfied?

many thanks

Tom

Parents
  • Hi Dave,

    It's very hard to tell you that I don't understand the meaning of how to set up registers in document<ADV7441A_ADV7441A@_ADV7441AVDP_ADV7441AHDMI_ADV7341-VER.MB2.0.txt> about AD9889B! beacause I even don't know the relationship of AD7441 and AD9889B in that document.

    Could you please to show me the details about how to set up registers of AD9889B personally?I'll really appreciation for that! and forgive me for my ignorant of that!

    RGB:              4:4:4;  8bit

    H,V and DE:    separate H,V and DE

    data bus:         D[23:0]

    polarity:           High(I'm not sure about this...there's no words to sign polarity of syncs and DE when these signals running separately.

                                  what's kind of polarity syncs and DE signals AD9889B needed,High or low?)

    HDCP:             No HDCP

    Audio:              No audio

    Output: 1080P@60

    Output:  720P@60

    Tom

Reply
  • Hi Dave,

    It's very hard to tell you that I don't understand the meaning of how to set up registers in document<ADV7441A_ADV7441A@_ADV7441AVDP_ADV7441AHDMI_ADV7341-VER.MB2.0.txt> about AD9889B! beacause I even don't know the relationship of AD7441 and AD9889B in that document.

    Could you please to show me the details about how to set up registers of AD9889B personally?I'll really appreciation for that! and forgive me for my ignorant of that!

    RGB:              4:4:4;  8bit

    H,V and DE:    separate H,V and DE

    data bus:         D[23:0]

    polarity:           High(I'm not sure about this...there's no words to sign polarity of syncs and DE when these signals running separately.

                                  what's kind of polarity syncs and DE signals AD9889B needed,High or low?)

    HDCP:             No HDCP

    Audio:              No audio

    Output: 1080P@60

    Output:  720P@60

    Tom

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