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Original question:

LMK04828: External reference input

LMK04828: LMK04828 in clk104

Fimmy Joy
Prodigy 60 points
Part Number: LMK04828

Tool/software:

I am trying to configure registers for LMK04828 in CLK104 board along with ZCU216. I am trying to give external input to J11 sma  which is inturn connected to Clkin_0 of LMK04828. Even when i am disabling automode and selecting the selecting clkin0 manual it is not taking external input given. I am attaching the configuration snapshots.
Also kindly let me know if i will have to make changes with existing holdover conditions used to enable clkin0.TICSPRO_Snapshots.zip

  • 0
    TI__Mastermind 29232 points

    Hello, 
    It seems you have FB_MUX_EN on and PLL1 is not locked to begin with. 

    Also having the N divider not equal to 1 is not valid when trying to utilize ZDM. 

    Do you have a block diagram or clock tree of what you're trying to implement? 

    Best regards, 

    Vicente 

  • 0 in reply to vicente flores prado
    TI__Mastermind 29232 points

    Holdover settings can be configured in the user controls flex page. 

  • 0 in reply to vicente flores prado
    Prodigy 60 points

    I am trying to feed external input to clk-0 through J11 sma .I want to use this input to feed pll1 and in turn pll2 to generate my output clocks of 250 MHz to drive LMZ2594.
    Can you please help me with register value sets.Please find the attached register set values

    Fullscreen 26042025_lmk_reg_values.txt Download 
    R0 (INIT)	0x000090
R0	0x000010
R2	0x000200
R3	0x000306
R4	0x0004D0
R5	0x00055B
R6	0x000600
R12	0x000C51
R13	0x000D04
R256	0x01006A
R257	0x010155
R258	0x010255
R259	0x010301
R260	0x010422
R261	0x010500
R262	0x010672
R263	0x010713
R264	0x01086A
R265	0x010955
R266	0x010A55
R267	0x010B00
R268	0x010C22
R269	0x010D00
R270	0x010EF0
R271	0x010F30
R272	0x01106A
R273	0x011155
R274	0x011255
R275	0x011301
R276	0x011422
R277	0x011500
R278	0x011672
R279	0x011713
R280	0x01186A
R281	0x011955
R282	0x011A55
R283	0x011B01
R284	0x011C22
R285	0x011D00
R286	0x011E72
R287	0x011F03
R288	0x012074
R289	0x012155
R290	0x012255
R291	0x012301
R292	0x012422
R293	0x012500
R294	0x012670
R295	0x012733
R296	0x01286A
R297	0x012955
R298	0x012A55
R299	0x012B00
R300	0x012C22
R301	0x012D00
R302	0x012EF0
R303	0x012F30
R304	0x01306A
R305	0x013155
R306	0x013255
R307	0x013301
R308	0x013422
R309	0x013500
R310	0x013673
R311	0x013703
R312	0x013800
R313	0x013903
R314	0x013A01
R315	0x013BF4
R316	0x013C00
R317	0x013D01
R318	0x013E03
R319	0x013F0A
R320	0x014009
R321	0x014100
R322	0x014200
R323	0x014311
R324	0x0144FF
R325	0x01457F
R326	0x01460A
R327	0x01470A
R328	0x014802
R329	0x014942
R330	0x014A06
R331	0x014B26
R332	0x014C00
R333	0x014D00
R334	0x014EC0
R335	0x014F7F
R336	0x015000
R337	0x015102
R338	0x015200
R339	0x015300
R340	0x01547D
R341	0x015500
R342	0x01567D
R343	0x015703
R344	0x0158C0
R345	0x015900
R346	0x015A01
R347	0x015BDA
R348	0x015C20
R349	0x015D00
R350	0x015E00
R351	0x015F0B
R352	0x016000
R353	0x0161FA
R354	0x016244
R355	0x016300
R356	0x016400
R357	0x0165A0
R369	0x0171AA
R370	0x017202
R380	0x017C15
R381	0x017D33
R358	0x016600
R359	0x016700
R360	0x01687D
R361	0x016959
R362	0x016A20
R363	0x016B00
R364	0x016C00
R365	0x016D00
R366	0x016E13
R371	0x017300
R8189	0x1FFD00
R8190	0x1FFE00
R8191	0x1FFF53

  • 0 in reply to vicente flores prado
    Prodigy 60 points

    Hi Vicente,

    I am  attaching register sets with changes mentioned in this thread

    .

    Fullscreen 8400.26042025_lmk_reg_values.txt Download 
    R0 (INIT)	0x000090
R0	0x000010
R2	0x000200
R3	0x000306
R4	0x0004D0
R5	0x00055B
R6	0x000600
R12	0x000C51
R13	0x000D04
R256	0x01006A
R257	0x010155
R258	0x010255
R259	0x010301
R260	0x010422
R261	0x010500
R262	0x010672
R263	0x010713
R264	0x01086A
R265	0x010955
R266	0x010A55
R267	0x010B00
R268	0x010C22
R269	0x010D00
R270	0x010EF0
R271	0x010F30
R272	0x01106A
R273	0x011155
R274	0x011255
R275	0x011301
R276	0x011422
R277	0x011500
R278	0x011672
R279	0x011713
R280	0x01186A
R281	0x011955
R282	0x011A55
R283	0x011B01
R284	0x011C22
R285	0x011D00
R286	0x011E72
R287	0x011F03
R288	0x012074
R289	0x012155
R290	0x012255
R291	0x012301
R292	0x012422
R293	0x012500
R294	0x012670
R295	0x012733
R296	0x01286A
R297	0x012955
R298	0x012A55
R299	0x012B00
R300	0x012C22
R301	0x012D00
R302	0x012EF0
R303	0x012F30
R304	0x01306A
R305	0x013155
R306	0x013255
R307	0x013301
R308	0x013422
R309	0x013500
R310	0x013673
R311	0x013703
R312	0x013800
R313	0x013903
R314	0x013A01
R315	0x013BF4
R316	0x013C00
R317	0x013D01
R318	0x013E03
R319	0x013F0A
R320	0x014009
R321	0x014100
R322	0x014200
R323	0x014311
R324	0x0144FF
R325	0x01457F
R326	0x01460A
R327	0x01470A
R328	0x014802
R329	0x014942
R330	0x014A06
R331	0x014B26
R332	0x014C00
R333	0x014D00
R334	0x014EC0
R335	0x014F7F
R336	0x015000
R337	0x015102
R338	0x015200
R339	0x015300
R340	0x01547D
R341	0x015500
R342	0x01567D
R343	0x015703
R344	0x0158C0
R345	0x015900
R346	0x015A01
R347	0x015BDA
R348	0x015C20
R349	0x015D00
R350	0x015E00
R351	0x015F0B
R352	0x016000
R353	0x0161FA
R354	0x016244
R355	0x016300
R356	0x016400
R357	0x0165A0
R369	0x0171AA
R370	0x017202
R380	0x017C15
R381	0x017D33
R358	0x016600
R359	0x016700
R360	0x01687D
R361	0x016959
R362	0x016A20
R363	0x016B00
R364	0x016C00
R365	0x016D00
R366	0x016E13
R371	0x017300
R8189	0x1FFD00
R8190	0x1FFE00
R8191	0x1FFF53

    Kindly let me know if any registers to be changed to achieve the desired output of 250 MHZ from external input of 100 MHz through J11 sma

  • 0 in reply to Fimmy Joy
    TI__Mastermind 29232 points

    Hi Fimmy, 
    Can you attach a .tcs file if possible? 

    Can you share a block diagram or clock tree of what your requirements are? I would need that to understand what you're trying to implement. 

    Best regards, 

    Vicente