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LMK04828: Unable to write FF value in 0x144 register

Blessing Selvakumar
Prodigy 135 points

Part Number: LMK04828

Dear team,

We are using LMK04828BISQE/NOPB in our design. we can only write 00 to 7F value in 0x144 register,we are unable to write only FF value in 0x144 register.If we write FF value in 0x144 register,while read back we find value 0 in 0x144 register.

Regards,
Blessing Selvakumar,
Hardware Design Engineer,
Datapatterns(India) Ltd.,

  • 0
    TI__Genius 12700 points

    Hi Selvakumar,

    Can you please share the configuration file, you are using for the programming, to look on the settings?

    R0x144[7] bit is a SYNC prevent bit for SYSREF divider. i.e. when the SYNC input comes, it should not SYNC the SYSREF divider, when keep value "1".

    But there can be possibility, when the device is configured in SYSREF 0-delay mode, where SYSREF divider is in the PLL loop and doesn't needed any SYNC event.

    Thanks!

    Regards,
    Ajeet Pal  

  • 0 in reply to Ajeet Pal
    Prodigy 135 points

    Hi Ajeet,

    Fullscreen 80Mhz Dev CLK and 5Mhz sysred(Buffer mode)1.txt Download 
    R0 (INIT)	0x000090
R0	0x000000
R2	0x000200
R3	0x000306
R4	0x0004D0
R5	0x00055B
R6	0x000600
R12	0x000C51
R13	0x000D04
R256	0x010061
R257	0x01015F
R258	0x010255
R259	0x010301
R260	0x010422
R261	0x010510
R262	0x010690
R263	0x010715
R264	0x010861
R265	0x010955
R266	0x010A55
R267	0x010B01
R268	0x010C22
R269	0x010D10
R270	0x010E90
R271	0x010F15
R272	0x011061
R273	0x011155
R274	0x011255
R275	0x011301
R276	0x011422
R277	0x011510
R278	0x011690
R279	0x011711
R280	0x011861
R281	0x011955
R282	0x011A55
R283	0x011B01
R284	0x011C22
R285	0x011D10
R286	0x011E90
R287	0x011F11
R288	0x012061
R289	0x012155
R290	0x012255
R291	0x012301
R292	0x012422
R293	0x012510
R294	0x012690
R295	0x012715
R296	0x012861
R297	0x012955
R298	0x012A55
R299	0x012B01
R300	0x012C22
R301	0x012D10
R302	0x012E90
R303	0x012F15
R304	0x013061
R305	0x013100
R306	0x013255
R307	0x0133B9
R308	0x013422
R309	0x013510
R310	0x013600
R311	0x013715
R312	0x013841
R313	0x013900
R314	0x013A00
R315	0x013B10
R316	0x013C00
R317	0x013D08
R318	0x013E03
R319	0x013F09
R320	0x0140E9
R321	0x01417F
R322	0x014200
R323	0x014311
R324	0x0144FF
R325	0x01457F
R326	0x014611
R327	0x014712
R328	0x014802
R329	0x014942
R330	0x014A02
R331	0x014B16
R332	0x014C00
R333	0x014D00
R334	0x014EC0
R335	0x014F7F
R336	0x015003
R337	0x015102
R338	0x015200
R339	0x015300
R340	0x015401
R341	0x015500
R342	0x015601
R343	0x015700
R344	0x015801
R345	0x015900
R346	0x015A14
R347	0x015BD4
R348	0x015C20
R349	0x015D00
R350	0x015E00
R351	0x015F0B
R352	0x016000
R353	0x016101
R354	0x016244
R355	0x016300
R356	0x016400
R357	0x01650C
R369	0x0171AA
R370	0x017202
R380	0x017C15
R381	0x017D33
R358	0x016600
R359	0x016700
R360	0x01680C
R361	0x016959
R362	0x016A20
R363	0x016B00
R364	0x016C00
R365	0x016D00
R366	0x016E13
R371	0x017320
R386	0x018200
R387	0x018300
R388	0x018400
R389	0x018500
R392	0x018800
R393	0x018900
R394	0x018A00
R395	0x018B00
R8189	0x1FFD00
R8190	0x1FFE00
R8191	0x1FFF53

    Regards,
    Blessing.selvakumar,
    Hardware Design Engineer,
    Datapatterns(India) Ltd.,

  • 0 in reply to Blessing Selvakumar
    TI__Genius 12700 points

    Hi Selvakumar,

    Seems you are operating the device in distribution mode and I don't see any issue on writing the 0x144 --> "FF" and reading back same value in my evaluation board.

    Can you please the schematic of LMK section and may be LMK exact use case in your system (clock input frequency / output frequency / operating mode etc..) to help you quickly?

    Thanks!

    Regards,

    Ajeet Pal