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Original question:

LMK04832: Unsure of Validity of Clock Outputs

LMK04832: Cannot get chip configured properly

Cameron Seamans
Prodigy 65 points

Part Number: LMK04832
Other Parts Discussed in Thread: LMX2594,

Hello,

I am using a commercial board that has an LMX04832 feeding three LMX2594 as well as numerous FPGA pins directly. I have a working programming file that sets up the LMK04832 for a 100MHz reference clock input, but I am now trying to make the same programming file except with an 800MHz reference clock input. I have attached the two txt files, hopefully you can tell me what is wrong with the 800MHz reference input version, because I have tried all sorts of changes without any success.

Thank you

  • 0
    Prodigy 65 points

    Fullscreen TI_lmk04832_800MHzRef_100MHzLMX_6MHz25SYSREF_50MHzPLCLKtxt_TP.txt Download 
    R0 (INIT)	0x000090
R0	0x000010
R251 0x015F3B
R2	0x000200
R3	0x000306
R4	0x0004D1
R5	0x000563
R6	0x000650
R12	0x000C51
R13	0x000D04
R256	0x0100C8
R257	0x01010A
R258	0x010210
R259	0x010350
R260	0x010410
R261	0x010500
R262	0x010601
R263	0x010701
R264	0x0108C8
R265	0x01090A
R266	0x010A00
R267	0x010B44
R268	0x010C20
R269	0x010D00
R270	0x010E01
R271	0x010F55
R272	0x0110C8
R273	0x01110A
R274	0x011200
R275	0x011344
R276	0x011420
R277	0x011500
R278	0x011601
R279	0x011755
R280	0x0118C8
R281	0x01190A
R282	0x011A00
R283	0x011B44
R284	0x011C10
R285	0x011D00
R286	0x011E01
R287	0x011F05
R288	0x012090
R289	0x01210A
R290	0x012201
R291	0x012340
R292	0x012410
R293	0x012500
R294	0x012601
R295	0x012705
R296	0x012819
R297	0x01290A
R298	0x012A00
R299	0x012B44
R300	0x012C30
R301	0x012D00
R302	0x012E01
R303	0x012FF0
R304	0x013019
R305	0x01310A
R306	0x013200
R307	0x013344
R308	0x013430
R309	0x013500
R310	0x013601
R311	0x0137C0
R312	0x013840
R313	0x013903
R314	0x013A01
R315	0x013B90
R316	0x013C00
R317	0x013D08
R318	0x013E03
R319	0x013F80
R320	0x01409B
R321	0x014100
R322	0x014200
R323	0x014311
R324	0x0144FF
R325	0x014500
R326	0x014610
R327	0x014712
R328	0x014802
R329	0x014902
R330	0x014A03
R331	0x014B06
R332	0x014C00
R333	0x014D00
R334	0x014EC0
R335	0x014F7F
R336	0x015001
R337	0x015102
R338	0x015200
R339	0x015300
R340	0x015478
R341	0x015500
R342	0x015678
R343	0x015700
R344	0x015896
R345	0x015900
R346	0x015A78
R347	0x015BD4
R348	0x015C20
R349	0x015D00
R350	0x015E1E
R351	0x015F3B
R352	0x016000
R353	0x016101
R354	0x0162AC
R355	0x016300
R356	0x016400
R357	0x016505
R371	0x017310
R361	0x016958
R362	0x016A20
R363	0x016B00
R364	0x016C00
R365	0x016D00
R366	0x016E13
R375	0x017700
R386	0x018200
R387	0x018300
R358	0x016600
R359	0x016700
R360	0x016805
R1365	0x055500
    Fullscreen TI_lmk04832_100MHzRef_100MHzLMX_6MHz25SYSREF_50MHzPLCLKtxt_TP.txt Download 
    R0 (INIT)	0x000090
R0	0x000010
R251 0x015F3B
R2	0x000200
R3	0x000306
R4	0x0004D1
R5	0x000563
R6	0x000650
R12	0x000C51
R13	0x000D04
R256	0x010019
R257	0x01010A
R258	0x010210
R259	0x010350
R260	0x010410
R261	0x010500
R262	0x010601
R263	0x010701
R264	0x010819
R265	0x01090A
R266	0x010A00
R267	0x010B44
R268	0x010C20
R269	0x010D00
R270	0x010E01
R271	0x010F55
R272	0x011019
R273	0x01110A
R274	0x011200
R275	0x011344
R276	0x011420
R277	0x011500
R278	0x011601
R279	0x011755
R280	0x011819
R281	0x01190A
R282	0x011A00
R283	0x011B44
R284	0x011C10
R285	0x011D00
R286	0x011E01
R287	0x011F05
R288	0x012032
R289	0x01210A
R290	0x012200
R291	0x012340
R292	0x012410
R293	0x012500
R294	0x012601
R295	0x012705
R296	0x012819
R297	0x01290A
R298	0x012A00
R299	0x012B44
R300	0x012C30
R301	0x012D00
R302	0x012E01
R303	0x012FF0
R304	0x013019
R305	0x01310A
R306	0x013200
R307	0x013344
R308	0x013430
R309	0x013500
R310	0x013601
R311	0x0137C0
R312	0x013800
R313	0x013903
R314	0x013A01
R315	0x013B90
R316	0x013C00
R317	0x013D08
R318	0x013E03
R319	0x013F80
R320	0x01409B
R321	0x014100
R322	0x014200
R323	0x014311
R324	0x0144FF
R325	0x014500
R326	0x014610
R327	0x01471A
R328	0x014802
R329	0x014902
R330	0x014A03
R331	0x014B06
R332	0x014C00
R333	0x014D00
R334	0x014EC0
R335	0x014F7F
R336	0x015001
R337	0x015102
R338	0x015200
R339	0x015300
R340	0x015478
R341	0x015500
R342	0x015678
R343	0x015700
R344	0x015896
R345	0x015900
R346	0x015A78
R347	0x015BD4
R348	0x015C20
R349	0x015D00
R350	0x015E1E
R351	0x015F3B
R352	0x016000
R353	0x016101
R354	0x0162AC
R355	0x016300
R356	0x016400
R357	0x016505
R371	0x017310
R361	0x016958
R362	0x016A20
R363	0x016B00
R364	0x016C00
R365	0x016D00
R366	0x016E13
R375	0x017700
R386	0x018200
R387	0x018300
R358	0x016600
R359	0x016700
R360	0x016805
R1365	0x055500

  • 0 in reply to Cameron Seamans
    TI__Genius 10995 points

    Hello Cameron,

    The configuration is not working for you because the LMK04832 cannot accept a 800 MHz input signal, unless it is used in distribution mode (which does not seem to be your case). Therefore, if you are trying to input 800 MHz into the device, you would need to use another device. Potentially, I could suggest one if you either tell me your VCXO frequency (I'm assuming it's 100 MHz), your output frequencies, output types, and number of outputs or if you attach the .tcs file instead of the .hex file. You can save the .tcs file as shown in the image below.

    Best,

    Andrea 

  • 0 in reply to Andrea Vallenilla
    Prodigy 65 points

    Hi Andrea,

    Thank you for the reply. That's good to know about 800MHz being too high for the mode I have it configured in. I also have 160MHz available to me to be provided as the CLKIn1 input. I have tried that and I still cannot get it to work. Maybe you can spot what I am doing incorrectly with the 160MHz input setup. I have attached the registers text file and the TICS project file.

    Thanks!

    CameronTI_lmk04832_160MHzRef_100MHzLMX_6MHz25SYSREF_50MHzPLCLK.tcs

    Fullscreen TI_lmk04832_160MHzRef_100MHzLMX_6MHz25SYSREF_50MHzPLCLKtxt_TP.txt Download 
    R0 (INIT)	0x000090
R0	0x000010
R251 0x015F3B
R2	0x000200
R3	0x000306
R4	0x0004D1
R5	0x000563
R6	0x000650
R12	0x000C51
R13	0x000D04
R256	0x010028
R257	0x01010A
R258	0x010210
R259	0x010350
R260	0x010410
R261	0x010500
R262	0x010601
R263	0x010701
R264	0x010828
R265	0x01090A
R266	0x010A00
R267	0x010B44
R268	0x010C20
R269	0x010D00
R270	0x010E01
R271	0x010F55
R272	0x011028
R273	0x01110A
R274	0x011200
R275	0x011344
R276	0x011420
R277	0x011500
R278	0x011601
R279	0x011755
R280	0x011828
R281	0x01190A
R282	0x011A00
R283	0x011B44
R284	0x011C10
R285	0x011D00
R286	0x011E01
R287	0x011F05
R288	0x012050
R289	0x01210A
R290	0x012200
R291	0x012340
R292	0x012410
R293	0x012500
R294	0x012601
R295	0x012705
R296	0x012819
R297	0x01290A
R298	0x012A00
R299	0x012B44
R300	0x012C30
R301	0x012D00
R302	0x012E01
R303	0x012FF0
R304	0x013019
R305	0x01310A
R306	0x013200
R307	0x013344
R308	0x013430
R309	0x013500
R310	0x013601
R311	0x0137C0
R312	0x013800
R313	0x013903
R314	0x013A02
R315	0x013B80
R316	0x013C00
R317	0x013D08
R318	0x013E03
R319	0x013F80
R320	0x01409B
R321	0x014100
R322	0x014200
R323	0x014311
R324	0x0144FF
R325	0x014500
R326	0x014610
R327	0x01471A
R328	0x014802
R329	0x014902
R330	0x014A03
R331	0x014B06
R332	0x014C00
R333	0x014D00
R334	0x014EC0
R335	0x014F7F
R336	0x015001
R337	0x015102
R338	0x015200
R339	0x015300
R340	0x015478
R341	0x015500
R342	0x015678
R343	0x015700
R344	0x015896
R345	0x015900
R346	0x015A78
R347	0x015BD4
R348	0x015C20
R349	0x015D00
R350	0x015E1E
R351	0x015F3B
R352	0x016000
R353	0x016101
R354	0x0162AC
R355	0x016300
R356	0x016400
R357	0x016505
R371	0x017310
R361	0x016958
R362	0x016A20
R363	0x016B00
R364	0x016C00
R365	0x016D00
R366	0x016E13
R375	0x017700
R386	0x018200
R387	0x018300
R358	0x016600
R359	0x016700
R360	0x016805
R1365	0x055500

  • +1 in reply to Cameron Seamans
    TI__Genius 10995 points

    Hello Cameron,

    What seemed to be the problem was that you were operating your VCO outside of it's possible ranges. You were operating VCO0 at 4000 MHz, when it ranges from 2440 to 2580 MHz. Therefore, I have generated a config for you below that will work for your application.

    E2E_4832_100_6M25_50_Out_Fixed.tcs

    Also, I noticed that by using VCO1 instead of VCO0 and using the OSCin pin as your input (instead of CLKin1), you could obtain a significantly higher phase detector frequency (PFD), which will give you significantly better performance. I have attached the improved config below.

    E2E_4832_100_6M25_50_Out_Improved.tcs

    Hope this helps!

    Good luck,

    Andrea

  • 0 in reply to Andrea Vallenilla
    Prodigy 65 points

    Andrea,

    Thank you so much for that fix, I tried out the first TICS project file and that worked for me! I need to use CLKin1 because of the way the commercial board is designed and my use case. 

    Thanks again for the help,

    Cameron