I first configured the LMX2820 registers with following content,
" 24'h004422, //R0 0x00, reset
24'h004420, //R0 0x00
24'h7A0000, //R122 0x7A
24'h790000, //R121 0x79
24'h780000, //R120 0x78
24'h770000, //R119 0x77
24'h760000, //R118 0x76
24'h750000, //R117 0x75
24'h740000, //R116 0x74
24'h730000, //R115 0x73
24'h720000, //R114 0x72
24'h710000, //R113 0x71
24'h70FFFF, //R112 0x70
24'h6F0000, //R111 0x6F
24'h6E001F, //R110 0x6E
24'h6D0000, //R109 0x6D
24'h6C0000, //R108 0x6C
24'h6B0000, //R107 0x6B
24'h6A0000, //R106 0x6A
24'h69000A, //R105 0x69
24'h680014, //R104 0x68
24'h670014, //R103 0x67
24'h660028, //R102 0x66
24'h6503E8, //R101 0x65
24'h640533, //R100 0x64
24'h6319B9, //R99 0x63
24'h621C80, //R98 0x62
24'h610000, //R97 0x61
24'h6017F8, //R96 0x60
24'h5F0000, //R95 0x5F
24'h5E0000, //R94 0x5E
24'h5D1000, //R93 0x5D
24'h5C0000, //R92 0x5C
24'h5B0000, //R91 0x5B
24'h5A0000, //R90 0x5A
24'h590000, //R89 0x59
24'h5803FF, //R88 0x58
24'h57FF00, //R87 0x57
24'h560040, //R86 0x56
24'h550000, //R85 0x55
24'h540040, //R84 0x54
24'h530F00, //R83 0x53
24'h520000, //R82 0x52
24'h510000, //R81 0x51
24'h5001C0, //R80 0x50
24'h4F011E, //R79 0x4F
24'h4E0001, //R78 0x4E
24'h4D0608, //R77 0x4D
24'h4C0000, //R76 0x4C
24'h4B0000, //R75 0x4B
24'h4A0000, //R74 0x4A
24'h490000, //R73 0x49
24'h480000, //R72 0x48
24'h470000, //R71 0x47
24'h46000E, //R70 0x46
24'h450011, //R69 0x45
24'h440020, //R68 0x44
24'h431000, //R67 0x43
24'h42003F, //R66 0x42
24'h410000, //R65 0x41
24'h404080, //R64 0x40
24'h3FC350, //R63 0x3F
24'h3E0000, //R62 0x3E
24'h3D03E8, //R61 0x3D
24'h3C01F4, //R60 0x3C
24'h3B1388, //R59 0x3B
24'h3A0000, //R58 0x3A
24'h390001, //R57 0x39
24'h380001, //R56 0x38
24'h370002, //R55 0x37
24'h360000, //R54 0x36
24'h350000, //R53 0x35
24'h340000, //R52 0x34
24'h33203F, //R51 0x33
24'h320080, //R50 0x32
24'h310000, //R49 0x31
24'h304180, //R48 0x30
24'h2F0300, //R47 0x2F
24'h2E0300, //R46 0x2E
24'h2D0000, //R45 0x2D
24'h2C0000, //R44 0x2C
24'h2B0000, //R43 0x2B
24'h2A0000, //R42 0x2A
24'h290000, //R41 0x29
24'h280000, //R40 0x28
24'h2703E8, //R39 0x27
24'h260000, //R38 0x26
24'h250500, //R37 0x25
24'h240032, //R36 0x24
24'h233100, //R35 0x23
24'h220010, //R34 0x22
24'h210000, //R33 0x21
24'h201081, //R32 0x20
24'h1F0401, //R31 0x1F
24'h1EB18C, //R30 0x1E
24'h1D318C, //R29 0x1D
24'h1C0639, //R28 0x1C
24'h1B8001, //R27 0x1B
24'h1A0DB0, //R26 0x1A
24'h190624, //R25 0x19
24'h180E34, //R24 0x18
24'h171102, //R23 0x17
24'h16E2BF, //R22 0x16
24'h151C64, //R21 0x15
24'h14272C, //R20 0x14
24'h132120, //R19 0x13
24'h120000, //R18 0x12
24'h1115C0, //R17 0x11
24'h10171C, //R16 0x10
24'h0F2001, //R15 0x0F
24'h0E3001, //R14 0x0E
24'h0D0038, //R13 0x0D
24'h0C0408, //R12 0x0C
24'h0B0612, //R11 0x0B
24'h0A0000, //R10 0x0A
24'h090005, //R9 0x09
24'h08C802, //R8 0x08
24'h070000, //R7 0x07
24'h060A43, //R6 0x06
24'h050032, //R5 0x05
24'h044204, //R4 0x04
24'h030041, //R3 0x03
24'h0281F4, //R2 0x02, INSTCAL_DLY 500, CAL_CLK_DIV 0
24'h0157A1, //R1 0x01, INSTCAL_EN 1, LD_VTUNE_EN 1, INSTCAL_DBLR_EN 0
24'h004430, //R0 0x00, FCAL_EN 1, DBLR_CAL_EN 0
24'h004420 //R0 0x00, FCAL_EN 0, DBLR_CAL_EN 0
", then I tuned frequency of VCO with the content below. However, it failed to lock.
"
24'h240000,
24'h260BEB,
24'h27C200,
24'h2A0387,
24'h2B6D0E,
24'h2C4BC8,
24'h2DECEE,
24'h004430
"
The TIC Pro shows, the content are written correctly.