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LMK5B33216: DPLL not locking to ref input

Kartik Vashisht
Intellectual 2265 points

Part Number: LMK5B33216

Hi,
There is an issue we are encountering with LMK5B33216 where the customer is trying to use only DPLL3 in the design to generate 12 outputs and not getting the lock to the REF0, according to them the DPPL is getting locked but not to REF0 instead to REF1 (free running clock)
Can you confirm if the below tcs file need to be changed to get the lock to REF0?
SKU2_LNK5B_lock1.tcs 

  • 0
    TI__Genius 17025 points

    Hi Kartik,

    From the .tcs file I see that REF0 frequency is 156 MHz--was this intended? Or did they want 156.25 MHz?

    I can lock to REF0=156.0 MHz on my bench with the tcs you shared.

    Regards,

    Jennifer

  • 0
    Prodigy 50 points

    Hi Jennifer,

    The required is for 156.25MHz.

    With the attached config .tcs file we are able to get lock on both REF0 & REF1 but not all the updated setting are getting loaded from EEPROM although the EPPROM write is successful as per GUI.

    When we read registers on power cycle found the DPLL3 settings for Auto Select priority of REF0 & REF1 is not getting stored and gets reset.

    Loading the .tcs file again is brining in the required settings and we get lock.

    Best Regards,

    Shubham

    SKU2_LMK5B33216_v5.0.tcs

  • 0 in reply to Shubham Srivastava
    TI__Genius 17025 points

    Hi Shubham,

    Please review the 8.4.4.3 Start-Up Options for Register Configuration and 8.5.1 Memory Overview sections of the datasheet.

    The EEPROM on the LMK5B does not store the REFx and DPLL registers. Therefore, in-system programming is required for the DPLL to lock after an EPROM boot. I suggest using the Programming page in TICS Pro to determine the proper post-EEPROM boot sequence to use.

    Regards,

    Jennifer

  • 0 in reply to Jennifer Bernal
    Prodigy 50 points

    Hi Jennifer,

    I did load the working .tcs file with dongle connected to the device and generated post-EEPROM boot sequence with "Remove registers for unused features" checked.

    I see approx. 350 registers being updated. Are all the registers updated here are really required for our implementation?

    Can you please check the attached file and confirm. Please correct me if I missed anything.

    Best Regards,

    Shubham

    Fullscreen SKU2_LMK5B33216_v5.0_Post-EEPROM_remove registers for unused features.txt Download 
    # Saved: C:\Users\ssrivastava\Desktop\Projects\Whistler\Release Images\W400\LMK1\SKU2_LMK5B33216_v5.0_Post-EEPROM_remove registers for unused features.txt at Mon Nov 03 14:55:08 2025
# Freeze DPLLs
R309	0x013540     # Freeze DPLL1
R459	0x01cb40     # Freeze DPLL2
R609	0x026140     # Freeze DPLL3

# Write ROM registers
R21	0x0015A1
R25	0x001901
R26	0x001A00
R32	0x002000
R37	0x00250F
R38	0x0026FF
R39	0x0027FF
R40	0x002820
R41	0x002900
R42	0x002A00
R43	0x002B00
R44	0x002C00
R49	0x003102
R54	0x003600
R55	0x003700
R56	0x003800
R57	0x003903
R58	0x003A0F
R59	0x003B0E
R60	0x003C3C
R61	0x003D00
R63	0x003F08
R67	0x00430C
R68	0x004403
R75	0x004B35
R76	0x004C1A
R77	0x004D1A
R78	0x004E00
R79	0x004F2E
R80	0x00502E
R83	0x0053A8
R84	0x005400
R85	0x005500
R86	0x00560C
R87	0x005700
R88	0x005800
R89	0x005936
R96	0x006000
R97	0x006100
R98	0x006200
R99	0x006304
R100	0x006400
R101	0x006500
R102	0x00662E
R109	0x006D00
R110	0x006E6F
R111	0x006F00
R112	0x007077
R113	0x007100
R114	0x00726F
R115	0x007300
R116	0x007477
R125	0x007D00
R126	0x007E18
R127	0x007FD5
R128	0x0080D5
R129	0x008100
R130	0x00821E
R131	0x008384
R132	0x008481
R133	0x008500
R134	0x00860F
R135	0x0087E5
R136	0x008803
R137	0x008900
R138	0x008A1E
R139	0x008B84
R140	0x008C81
R157	0x009D0A
R158	0x009E0A
R161	0x00A100
R162	0x00A200
R163	0x00A300
R164	0x00A400
R228	0x00E400
R247	0x00F755
R248	0x00F842
R261	0x010503
R300	0x012C3E
R352	0x016000
R378	0x017A00
R397	0x018D55
R398	0x018E6E
R411	0x019B03
R450	0x01C214
R502	0x01F600
R523	0x020B0A
R525	0x020D00
R526	0x020E01
R528	0x021080
R529	0x021109
R530	0x021200
R531	0x02130C
R532	0x021400
R533	0x021503
R534	0x02160D
R535	0x021740
R536	0x021800
R537	0x021900
R538	0x021A17
R539	0x021B70
R540	0x021C00
R541	0x021D01
R542	0x021E86
R543	0x021FA0
R547	0x0223DD
R548	0x022456
R549	0x0225E4
R550	0x022600
R551	0x022700
R552	0x022800
R553	0x022900
R554	0x022A00
R555	0x022B00
R556	0x022C00
R557	0x022D00
R558	0x022E00
R559	0x022F00
R560	0x023000
R561	0x023103
R562	0x023200
R563	0x023300
R564	0x02340F
R565	0x0235A0
R566	0x023600
R567	0x023700
R568	0x023800
R569	0x023900
R570	0x023A0F
R571	0x023B0E
R572	0x023C0F
R573	0x023D08
R574	0x023E08
R575	0x023F08
R576	0x024008
R577	0x024108
R578	0x024206
R579	0x024308
R580	0x024406
R581	0x024511
R582	0x024605
R583	0x024707
R584	0x024814
R585	0x024971
R586	0x024A03
R587	0x024BEB
R588	0x024C01
R589	0x024D85
R590	0x024E01
R591	0x024F88
R592	0x025001
R593	0x025192
R594	0x025219
R595	0x025342
R596	0x025401
R597	0x025540
R598	0x025600
R599	0x02570A
R600	0x025814
R601	0x025908
R602	0x025A08
R603	0x025B1B
R604	0x025C1E
R605	0x025D07
R606	0x025E3F
R607	0x025F0F
R608	0x026000
R614	0x026600
R615	0x026700
R616	0x026800
R617	0x026900
R618	0x026A18
R619	0x026B00
R620	0x026C00
R621	0x026D00
R622	0x026E00
R623	0x026F00
R624	0x027000
R625	0x027100
R626	0x027200
R627	0x027300
R628	0x027400
R629	0x027500
R630	0x027600
R631	0x027700
R632	0x027807
R633	0x0279AE
R634	0x027A14
R635	0x027B7A
R636	0x027CE1
R637	0x027D47
R638	0x027EAE
R639	0x027FFF
R640	0x0280FF
R641	0x0281FF
R642	0x0282FF
R643	0x0283FF
R644	0x028400
R645	0x028503
R646	0x028600
R647	0x028700
R648	0x028800
R649	0x028900
R650	0x028A00
R651	0x028B00
R652	0x028C00
R658	0x029200
R659	0x029300
R660	0x029419
R661	0x029500
R662	0x029604
R667	0x029B00
R668	0x029C00
R669	0x029D01
R670	0x029E01
R840	0x034822
R841	0x034915
R842	0x034A01
R843	0x034B0D
R844	0x034C0D
R845	0x034DFF
R857	0x035905
R864	0x0360FB
R866	0x036204
R962	0x03C200
R963	0x03C328
R965	0x03C500
R966	0x03C614
R968	0x03C809
R969	0x03C933
R972	0x03CC00
R974	0x03CE00
R976	0x03D000
R978	0x03D200
R980	0x03D400
R982	0x03D600
R983	0x03D705
R984	0x03D800
R985	0x03D900
R986	0x03DA00
R987	0x03DBFA
R988	0x03DC00
R989	0x03DD00
R990	0x03DE00
R991	0x03DF00
R1025	0x040103
R1026	0x04020F
R1027	0x040308
R1028	0x040400
R1030	0x040600
R1057	0x042103
R1058	0x04220F
R1059	0x042308
R1060	0x042400
R1062	0x042600
R1090	0x04420C
R1092	0x04440C
R1093	0x044531
R1094	0x044623
R1095	0x044700
R1097	0x044900
R1099	0x044B00
R1100	0x044C05
R1101	0x044D00
R1102	0x044E00
R1103	0x044F00
R1104	0x0450FA
R1105	0x045100
R1106	0x045200
R1107	0x045300
R1108	0x045410
R1122	0x04620C
R1124	0x04640C
R1125	0x046531
R1126	0x046623
R1127	0x046700
R1129	0x046900
R1131	0x046B00
R1132	0x046C05
R1133	0x046D00
R1134	0x046E00
R1135	0x046F00
R1136	0x0470FA
R1137	0x047100
R1138	0x047200
R1139	0x047300
R1140	0x047410
R1154	0x04820C
R1156	0x04840C
R1157	0x048531
R1158	0x048623
R1159	0x048700
R1161	0x048900
R1163	0x048B00
R1164	0x048C05
R1165	0x048D00
R1166	0x048E00
R1167	0x048F00
R1168	0x0490FA
R1169	0x049100
R1170	0x049200
R1171	0x049300
R1172	0x049410
R1186	0x04A20C
R1188	0x04A40C
R1189	0x04A531
R1190	0x04A623
R1191	0x04A700
R1193	0x04A900
R1195	0x04AB00
R1196	0x04AC05
R1197	0x04AD00
R1198	0x04AE00
R1199	0x04AF00
R1200	0x04B0FA
R1201	0x04B100
R1202	0x04B200
R1203	0x04B300
R1204	0x04B410
R1218	0x04C20C
R1220	0x04C40C
R1221	0x04C531
R1222	0x04C623
R1223	0x04C700
R1225	0x04C900
R1227	0x04CB00
R1228	0x04CC05
R1229	0x04CD00
R1230	0x04CE00
R1231	0x04CF00
R1232	0x04D0FA
R1233	0x04D100
R1234	0x04D200
R1235	0x04D300
R1236	0x04D410
R1249	0x04E103
R1250	0x04E20F
R1251	0x04E308
R1252	0x04E400
R1254	0x04E600
R1281	0x050103
R1282	0x05020F
R1283	0x050308
R1284	0x050400
R1286	0x050600

# Reset DPLLs
R22	0x001610
R23	0x00172a
R22	0x001630

# Unfreeze DPLLs ROM registers
R309	0x013500    # Unfreeze DPLL1
R459	0x01cb00    # Unfreeze DPLL2
R609	0x026100    # Unfreeze DPLL3

  • 0 in reply to Shubham Srivastava
    TI__Intellectual 2265 points

    Hi Jennifer,
    Can you help provide your inputs for the above query, also can you help provide the list of registers that need to be changed from the default factory part for the config file that the customer is using? 

    Is there any sequence in which we have to write the registers or the register write/programming can be in random order?

  • 0 in reply to Kartik Vashisht
    TI__Genius 17025 points

    Hi Shubham,

    Thank you for your patience.

    Yes, the post-EEPROM boot sequence is recommended to write all of the remaining registers that are not stored in EEPROM. I suggest performing the sequence in the order provided because it includes freezing the DPLLs, updated the DPLL settings, then unfreezing the DPLLs.

    Is there a concern with following that sequence?

    Kindly,

    Jennifer

  • 0 in reply to Jennifer Bernal
    Prodigy 50 points

    Hi Jennifer,

    The end goal is to use the blank part or part with default configurations. 
    Software will configure the LMK5B33216 buffer at every power-on, before initializing the system.
    So please help us with the complete list of registers and values to be updated in required sequence at power-on w.r.t the config file v5 shared earlier.
    I'm also trying to figure out the register list and sequence myself using the tool. My understanding is as below.
    Procedure : I need to load the working .tcs file with dongle connected to the device and generate the programming sequence with "Remove registers for unused features" checked.

    Is the above procedure ok, if yes please confirm which option to select from a) or b).

    In register programming sequence, I see two options;

    a) Register map programming

    b) Start-up programming sequence

    Please add additional inputs if any.

    Best Regards,

    Shubham

  • 0 in reply to Shubham Srivastava
    TI__Genius 17025 points

    Hi Shubham,

    If this is true for you, then use the Start-Up Programming Sequence:

    1. Boot-up from a factory blank part.
    2. Device automatically loads from a ROM page (cannot be bypassed).
    3. Device automatically bypasses the EEPROM.
    4. Use in-system programming to program all of the registers and overwrite ROM settings.

    If this is true for you, then use the Post-EEPROM Boot Programming Sequence:

    1. Boot-up from a factory blank part.
    2. Device automatically loads from a ROM page (cannot be bypassed).
    3. Device automatically bypasses the EEPROM for the first boot.
    4. Use in-system programming to program the EEPROM.
      1. Only the XO, APLL, and output registers are stored in EEPROM.
    5. Next boot-up.
    6. Device automatically loads from a ROM page (cannot be bypassed).
    7. Device automatically loads from the EEPROM.
    8. Use in-system programming to program the remaining registers (DPLL, inputs, DCO, SYSREF, etc.)
    9. Repeat Step 5 to 8 for subsequent boots.

    The Register map programming list is simply a sequential list of registers from R0 to Rn and is not recommended as a proper start-up sequence. It is recommended more for storing the register configuration for reference.

    Regards,

    Jennifer