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Original question:

LMK03328: Connecting digital inputs to 1.8V LVCMOS

LMK03328: Unable to get outputs to drive after programming EEPROM

Stuart Smith1
Prodigy 150 points
Part Number: LMK03328

Hello team

I am having trouble getting my LMK03328 to put out the clocks on its outputs. I am able to program the device from the default mode and obtain the desired outputs after the first programming of the registers, but after I committed these same registers to EEPROM, the outputs no longer appear and I am unable to get the outputs to enable again. In other words, I cannot even get a new register write to output the clocks even though those same register writes successfully worked before. I can see that the EEPROM programming is successful by checking the programming counter register. Does anyone have any idea where to start debugging this?

Kind regards,

Stuart Smith

  • 0
    Prodigy 150 points

    Hello again

    My register file attached:

    Fullscreen CLOutput.txt Download 
    R0	0x0010
R1	0x010B
R2	0x0232
R3	0x0300
R4	0x0400
R5	0x0500
R6	0x0600
R7	0x0700
R8	0x0800
R9	0x0900
R10	0x0AA8
R11	0x0B00
R12	0x0CDF
R13	0x0D00
R14	0x0E00
R15	0x0F00
R16	0x1000
R17	0x1100
R18	0x1200
R19	0x1300
R20	0x1455
R21	0x1555
R22	0x1600
R23	0x1700
R24	0x1800
R25	0x19F5
R26	0x1A00
R27	0x1B28
R28	0x1C50
R29	0x1D00
R30	0x1E00
R31	0x1F7C
R32	0x2078
R33	0x211F
R34	0x2232
R35	0x2378
R36	0x2407
R37	0x253C
R38	0x2631
R39	0x27FC
R40	0x2800
R41	0x297C
R42	0x2A13
R43	0x2B7C
R44	0x2C13
R45	0x2DAC
R46	0x2E3B
R47	0x2F3B
R48	0x30FF
R49	0x3100
R50	0x320A
R51	0x3303
R52	0x3400
R53	0x3500
R54	0x3600
R55	0x3703
R56	0x3816
R57	0x3918
R58	0x3A00
R59	0x3B96
R60	0x3C00
R61	0x3D00
R62	0x3E00
R63	0x3F00
R64	0x4000
R65	0x4101
R66	0x420C
R67	0x432F
R68	0x4401
R69	0x4578
R70	0x4607
R71	0x4702
R72	0x4818
R73	0x4902
R74	0x4A71
R75	0x4B00
R76	0x4C00
R77	0x4D00
R78	0x4E00
R79	0x4F00
R80	0x5001
R81	0x510C
R82	0x5220
R83	0x5300
R84	0x5478
R85	0x5500
R86	0x5634
R87	0x5700
R88	0x5800
R89	0x59DE
R90	0x5A01
R91	0x5B18
R92	0x5C01
R93	0x5D4B
R94	0x5E01
R95	0x5F86
R96	0x6001
R97	0x61BE
R98	0x6201
R99	0x63FE
R100	0x6402
R101	0x6547
R102	0x6602
R103	0x679E
R104	0x6803
R105	0x69FF
R106	0x6A05
R107	0x6B0F
R108	0x6C0F
R109	0x6D0F
R110	0x6E0F
R111	0x6F00
R112	0x7000
R113	0x7100
R114	0x7200
R115	0x7308
R116	0x7419
R117	0x7500
R118	0x7603
R119	0x7705
R120	0x7800
R121	0x790F
R122	0x7A0F
R123	0x7B0F
R124	0x7C0F
R125	0x7D00
R126	0x7E00
R127	0x7F00
R128	0x8000
R129	0x8108
R130	0x8219
R131	0x8300
R132	0x8403
R133	0x8505
R134	0x8600
R135	0x8700
R136	0x8800
R137	0x8930
R138	0x8A00
R139	0x8B00
R140	0x8C00
R141	0x8D00
R142	0x8E00
R143	0x8F00
R144	0x9000
R145	0x9100
R169	0xA940
R172	0xAC24
R173	0xAD00
     Kind regards,

    Stuart Smith

  • 0 in reply to Stuart Smith1
    TI__Genius 16845 points
    Hi Stuart,

    Are you using the LMK03328EVM and TICS Pro? What are the input frequencies?

    What procedure did you follow to write the EEPROM? There are two methods outlined in the datasheet to write to SRAM: Register commit method and direct SRAM access.

    Which EEPROM page are you writing to? If the EEPROM programming is successful, configure GPIO[3:2] to initialize from the desired page and initiate a power cycle.

    One way to determine whether an EEPROM write was successful is to readback of R137.5. From datasheet page 57: "If an EEPROM write is unsuccessful, a readback of R137.5 will result in a 1." See section 10.5.5 for more info

    Kind regards,
    Lane
  • 0 in reply to Lane Boyd
    Prodigy 150 points

    Hi Lane

    Thank you for your reply.

    I am using my own design, not the EVM. The input frequencies are both 16MHz. 

    I used the register commit method to write to the EEPROM.

    I am writing to page 0 of the EEPROM and the device always loads from page 0 on power up (GPIO[3:2] = 00]. I have confirmed that the correct register values are loaded after a startup by reading them back from the LMK03328. The EEPROM write is always successful.

    Upon further investigation, using the LOL ouptputs from the STATUS pins, it seems that the PLL is not locking when loading the registers from the EEPROM. Note, however, if I let the default EEPROM entries load at startup and then alter the register values via I2C to my setup, I can see the correct outputs. However, if I write that same data to the EEPROM, the PLL cannot lock. Could there be any reason for this?

    Regards,

    Stuart

  • 0 in reply to Stuart Smith1
    Prodigy 150 points

    Hi again Lane

    I have gone back and checked bit R137.5 after an EEPROM program routine. It seems that the bit is indeed asserted. Not only that, bit R137.0 is also asserted, which is strange as that bit should deassert automatically after an EEPROM program/erase cycle. Additionally, the EEPROM program register is incrementing every time I program the EEPROM. EDIT: I am using TICSPro now and I am not getting any CRC errors, however the behaviour remains unchanged: The VCOs appear not to be capable of locking.


    I find it strange that the EEPROM program is unsuccessful as I am able to read back all of the registers correctly after a power cycle. Before I program the EEPROM, I write 0xEA to the NVMUNLK register. The very next I2C write is the EEPROM commit command. I am not sure what could possibly be going wrong.

    Kind regards,
    Stuart

  • 0 in reply to Stuart Smith1
    TI__Genius 11900 points

    Hello Stuart,

    Thanks for the details, I'll take over for Lane.

    I have your frequency plan  from the other e2e you posted earlier.

    1. Could you try toggling the RESETN_SW bit after you load the registers from the EEPROM. (may help with the VCOs locking)
    2. Please send over your TICS-Pro file (TCS) so I can take a look at your setup (File -> Save)
    3. Are you using TICS-Pro to program the chip or exporting the raw registers and doing it over your i2c protocol?

    Thanks!

  • 0 in reply to Vibhu Vanjari
    Prodigy 150 points

    Hello Vibhu

    Thanks for the feedback once again.

    I found the issue, it appears that the reference detector was not set up correctly. I had to use slew rate detection as it did not seem to work with level detection. Thank you for the help.

    Regards,

    Stuart