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Original question:

CDCI6214: FOD Calculation

CDCI6214: FOD

user5214477
Intellectual 270 points
Part Number: CDCI6214


Hi 

The CDCI6214 was used for generate clock for FPGA， After many experiments and calculations, I find FOD doesn't work.

I was used  TICS Pro to generate settings.

I don't know why. Can someone help me?

The following is the settings file generated by TICS Pro，

R70 0x00460000
R69 0x00450000
R68 0x00440000
R67 0x00430020
R66 0x00420000
R65 0x00410F34
R64 0x0040000D
R63 0x003F0210
R62 0x003E4209
R61 0x003D1530
R60 0x003C0018
R59 0x003B1069
R58 0x003A0000
R57 0x00390A45
R56 0x00380411
R55 0x00370005
R54 0x00360000
R53 0x00356000
R52 0x00340000
R51 0x00330A65
R50 0x00320411
R49 0x00314003
R48 0x00300000
R47 0x002F8000
R46 0x002E0000
R45 0x002D0A65
R44 0x002C0411
R43 0x002B8004
R42 0x002A00BA
R41 0x00299174
R40 0x00280000
R39 0x00270A65
R38 0x00260411
R37 0x00250005
R36 0x002401D9
R35 0x0023B6C4
R34 0x00220050
R33 0x00210007
R32 0x00200000
R31 0x001F1E72
R30 0x001E5146
R29 0x001D0036
R28 0x001C0000
R27 0x001B0002
R26 0x001A0E18
R25 0x00190000
R24 0x00180001
R23 0x00170000
R22 0x00160000
R21 0x00150000
R20 0x00140000
R19 0x00130000
R18 0x00120000
R17 0x001126C4
R16 0x0010921F
R15 0x000FA037
R14 0x000E0000
R13 0x000D0000
R12 0x000C0000
R11 0x000B0000
R10 0x000A0000
R9 0x00090000
R8 0x00080000
R7 0x00070000
R6 0x00060000
R5 0x00050000
R4 0x00040000
R3 0x00030000
R2 0x00020053
R1 0x00016A72
R0 0x00001000

  • 0
    TI__Genius 16845 points

    When this occurs it indicates the FOD needs to be reset. After programming all of the device registers, reset the channel 2 FOD by writing 0 > 1 > 0 to ch2_fod_rst bit (register 0x2D bit 13).

    Kind regards,
    Lane

  • 0 in reply to Lane Boyd
    Intellectual 270 points

    Dear Lane

    Thank you for your reply.

    I was reset the channel 2 FOD , and I tried many times.but it didn't solve the problem.

    For example , I set  the VCO in 2700MHz, and target frequency is 125MHz, but the actual output frequency is 168.75MHz

    2700/168.75 = 16, 

    2700/125 = 21.6

    when the Fvco / Ftarget is fraction , the output frequency is not equal to the target frequency, 

    so I think FOD doesn't woke when the Fvco / Ftarget is fraction.

    And I'm surprised that CDCI6214 can adjust its frequency division and choose its output frequency.