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ADV7280-M Image gray output (setting confirm)

We designed the schematic as shown below, set it as a register given on the homepage, and when outputting the image, the image does not come out in color and comes out in gray.
Please check if there are any additional settings that need to be done.
DEVADR = 0x42 /
DELAY = 10 /
REGW = X00, X00 / ; INSEL = CVBS in on Ain 1
REGW = X27, XFF /
REGW = X0D, XFF /
REGW = X0F, X00 / ; Exit power down mode;PWRDWN 1-Active[5], Reset[7] 1-Active
REGW = X0E, X00 / ; Enter User Sub Map
REGW = X9C, X00 / ; ADI Required Write
REGW = X9C, XFF / ; ADI Required Write
REGW = X0E, X00 / ; Enter User Sub Map
REGW = X03, X4E / ; ADI Required Write
REGW = X04, X57 / ; Enable Intrq pin
REGW = X13, X00 / ; Enable INTRQ output driver
REGW = X17, X41 / ; select SH1
REGW = X1D, XC0 / ; Tri-State LLC output driver
REGW = X52, XCD / ; ADI Required Write
REGW = X80, X51 / ; ADI Required Write
REGW = X81, X51 / ; ADI Required Write
REGW = X82, X68 / ; ADI Required Write
REGW = XFD, X84 / ; Set VPP Map Address
DEVADR = 0x84 /
DELAY = 5 /
REGW = X0E, X00 /
REGW = XA3, X00 / ; ADI Required Write
REGW = X5B, X00 / ; Advanced Timing Enabled
REGW = X55, X80 / ; Enable I2P
DEVADR = 0x42 /
DELAY = 5 /
REGW = XFE, X88 / ; Set CSI Map Address
DEVADR = 0x88 /
REGW = X0E, X00 /
REGW = X01, X20 / ; ADI Required Write
REGW = X02, X28 / ; ADI Required Write
REGW = X03, X38 / ; ADI Required Write
REGW = X04, X30 / ; ADI Required Write
REGW = X05, X30 / ; ADI Required Write
REGW = X06, X80 / ; ADI Required Write
REGW = X07, X70 / ; ADI Required Write
REGW = X08, X50 / ; ADI Required Write
REGW = XDE, X02 / ; Power up D-PHY
REGW = XD2, XF7 / ; ADI Required Write
REGW = XD8, X65 / ; ADI Required Write
REGW = XE0, X09 / ; ADI Required Write
REGW = X2C, X00 / ; ADI Required Write
REGW = X1D, X80 / ; ADI Required Write
REGW = X00, X00 / ; Power up CSI Block
Parents
  • Hi,

    Please make sure with below things, if we are not using a standard CVBS signal then it cannot be guaranteed that the ADV7280 will lock to it.

    1) Check that the FSC_lock bit (User Map register 0x10 bit[2]) is high. This bit indicates that the ADV7280 has locked correctly to the color subcarrier.

    2) You can disable or change the threshold for the color kill function. The color kill function forces the ADV7280
    into black and white or gray output if the amplitude of the color subcarrier is too small. See the following bits in the ADV728x hardware manual

    CKE, Color Kill Enable, Address 0x2B[6]
    CKILLTHR[2:0], Color Kill Threshold, Address 0x3D[6:4]

    3) And also check the "Autodetect enable"  bits (User Map register 0x07). If you know the particular type of PAL (PAL-I, PAL-60, PAL-M etc) then you can program the ADV7280 autodetect algorithm to only look for that PAL standard.

    Note : ADV728x may not work for poor video signals.  If the color burst is below that percentage of the standard's value then the color will be killed,this will happen due to weak signal. If the color subcarrier is below 14.275mVpp,then the ADV7280 will not be able to lock to the color subcarrier and it will output a black and white image.

    And also please make sure with crystal clock (i.e) Make sure you are providing correct XTAL 28.6363,and your script selects 28.63636 crystal.

    Thanks,

    Poornima

Reply
  • Hi,

    Please make sure with below things, if we are not using a standard CVBS signal then it cannot be guaranteed that the ADV7280 will lock to it.

    1) Check that the FSC_lock bit (User Map register 0x10 bit[2]) is high. This bit indicates that the ADV7280 has locked correctly to the color subcarrier.

    2) You can disable or change the threshold for the color kill function. The color kill function forces the ADV7280
    into black and white or gray output if the amplitude of the color subcarrier is too small. See the following bits in the ADV728x hardware manual

    CKE, Color Kill Enable, Address 0x2B[6]
    CKILLTHR[2:0], Color Kill Threshold, Address 0x3D[6:4]

    3) And also check the "Autodetect enable"  bits (User Map register 0x07). If you know the particular type of PAL (PAL-I, PAL-60, PAL-M etc) then you can program the ADV7280 autodetect algorithm to only look for that PAL standard.

    Note : ADV728x may not work for poor video signals.  If the color burst is below that percentage of the standard's value then the color will be killed,this will happen due to weak signal. If the color subcarrier is below 14.275mVpp,then the ADV7280 will not be able to lock to the color subcarrier and it will output a black and white image.

    And also please make sure with crystal clock (i.e) Make sure you are providing correct XTAL 28.6363,and your script selects 28.63636 crystal.

    Thanks,

    Poornima

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