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LMX2594: Not Responding to SPI Commands

Preston Biocevich
Prodigy 10 points
Part Number: LMX2594
Other Parts Discussed in Thread: LMK61PD0A2, USB2ANY,

I am using an Arty-A7 FPGA dev board to send SPI Commands into the LMX2594. When I send my commands I get no response from the device, I have verified the boards operation by programming it with the LMK61PD0A2. I have also tried programming the board using the LMK61PD0A2, verifying the frequency, then connecting the Arty-A7 and sending a reset command, with no response. I have compared timing and have found no issue and also tried using another Arty-A7.

I have also tried booting the PLL using the guide from the data sheet

Reset = 1

Reset = 0

Program Registers

Delay

Program Cal Bit

I probed the SPI busses on the Arty-A7 "Please Note my SPI Data Bus is set to 5V/Div"

  • 0
    TI__Mastermind 22491 points

    Hi Preston, 
    Could you list out your programming sequence, step by step. 

    Do you have USB2ANY module or ref pro board & SPI testpoints that connect to LMX2594 on your custom board? 

    Regards, 

    Vicente

  • 0 in reply to vicente flores prado
    Prodigy 10 points

    Programming Sequence

    1.) Power on LMX2594

    2.) Program R0 0x2 Reset = 1

    3.) Program R0 0x2 Reset = 0

    4.) Load Register R78 to R0 from Highest to Lowest

    I generated these values TICS Pro and dumped them into a text file

    It should generate a 2.560GHz Signal

    x"700000";
    x"6F0000";
    x"6E0000";
    x"6D0000";
    x"6C0000";
    x"6B0000";
    x"6A0000";
    x"690021";
    x"680000";
    x"670000";
    x"660000";
    x"650011";
    x"640000";
    x"630000";
    x"620000";
    x"610888";
    x"600000";
    x"5F0000";
    x"5E0000";
    x"5D0000";
    x"5C0000";
    x"5B0000";
    x"5A0000";
    x"590000";
    x"580000";
    x"570000";
    x"560000";
    x"550000";
    x"540000";
    x"530000";
    x"520000";
    x"510000";
    x"500000";
    x"4F0000";
    x"4E0003";
    x"4D0000";
    x"4C000C";
    x"4B0840";
    x"4A0000";
    x"49003F";
    x"480001";
    x"470081";
    x"46C350";
    x"450000";
    x"4403E8";
    x"430000";
    x"4201F4";
    x"410000";
    x"401388";
    x"3F0000";
    x"3E0322";
    x"3D00A8";
    x"3C0000";
    x"3B0001";
    x"3A9001";
    x"390020";
    x"380000";
    x"370000";
    x"360000";
    x"350000";
    x"340820";
    x"330080";
    x"320000";
    x"314180";
    x"300300";
    x"2F0300";
    x"2E07FC";
    x"2DC0DF";
    x"2C1FA3";
    x"2B00C8";
    x"2A0000";
    x"290000";
    x"280000";
    x"2703E8";
    x"260000";
    x"250404";
    x"240033";
    x"230004";
    x"220000";
    x"211E21";
    x"200393";
    x"1F43EC";
    x"1E318C";
    x"1D318C";
    x"1C0488";
    x"1B0002";
    x"1A0DB0";
    x"190C2B";
    x"18071A";
    x"17007C";
    x"160001";
    x"150401";
    x"14E048";
    x"1327B7";
    x"120064";
    x"11012C";
    x"100080";
    x"0F064F";
    x"0E1E70";
    x"0D4000";
    x"0C5001";
    x"0B0018";
    x"0A10D8";
    x"091604";
    x"082000";
    x"0740B2";
    x"06C802";
    x"0500C8";
    x"040A43";
    x"030642";
    x"020500";
    x"010808";
    x"002514";

    5.) Wait 10ms

    6.) Program R0 00251C

    I do not have USB2ANY module or ref pro board, I have been heavily relying on the o-scope. I do have a logic analyzer but, I need to set aside some time to learn how it works

  • 0 in reply to Preston Biocevich
    TI__Mastermind 22491 points

    Hi Preston, 
    Can you attach the config file directly? 
    You can insert files:

    This will be easier for me to check config. 
    If you could attach both a .tcs file and the .txt file - that would be great!

    Regards, 

    Vicente 

  • 0 in reply to vicente flores prado
    Prodigy 10 points

    Text File containing Writes:

    2.560.txt 
    x"700000";
x"6F0000";
x"6E0000";
x"6D0000";
x"6C0000";
x"6B0000";
x"6A0000";
x"690021";
x"680000";
x"670000";
x"660000";
x"650011";
x"640000";
x"630000";
x"620000";
x"610888";
x"600000";
x"5F0000";
x"5E0000";
x"5D0000";
x"5C0000";
x"5B0000";
x"5A0000";
x"590000";
x"580000";
x"570000";
x"560000";
x"550000";
x"540000";
x"530000";
x"520000";
x"510000";
x"500000";
x"4F0000";
x"4E0003";
x"4D0000";
x"4C000C";
x"4B0840";
x"4A0000";
x"49003F";
x"480001";
x"470081";
x"46C350";
x"450000";
x"4403E8";
x"430000";
x"4201F4";
x"410000";
x"401388";
x"3F0000";
x"3E0322";
x"3D00A8";
x"3C0000";
x"3B0001";
x"3A9001";
x"390020";
x"380000";
x"370000";
x"360000";
x"350000";
x"340820";
x"330080";
x"320000";
x"314180";
x"300300";
x"2F0300";
x"2E07FC";
x"2DC0DF";
x"2C1FA3";
x"2B00C8";
x"2A0000";
x"290000";
x"280000";
x"2703E8";
x"260000";
x"250404";
x"240033";
x"230004";
x"220000";
x"211E21";
x"200393";
x"1F43EC";
x"1E318C";
x"1D318C";
x"1C0488";
x"1B0002";
x"1A0DB0";
x"190C2B";
x"18071A";
x"17007C";
x"160001";
x"150401";
x"14E048";
x"1327B7";
x"120064";
x"11012C";
x"100080";
x"0F064F";
x"0E1E70";
x"0D4000";
x"0C5001";
x"0B0018";
x"0A10D8";
x"091604";
x"082000";
x"0740B2";
x"06C802";
x"0500C8";
x"040A43";
x"030642";
x"020500";
x"010808";
x"00251C";

    TCS File:2.56_setup.tcs

    I appreciate the help let me know if you need any other information.

  • 0 in reply to Preston Biocevich
    TI__Mastermind 22491 points

    Hi Preston, 
    The .tcs file does not give me any issue, I can open it on the LMX2594EVM and see the device lock and output 2560 MHz RFout.
    The .txt file on the other hand gives me issues.

    I have reattached a new .txt file generated from the .tcs file you shared.

    Please try this one and let me know if it works. 

     

    0486.txt 
    R112	0x700000
R111	0x6F0000
R110	0x6E0000
R109	0x6D0000
R108	0x6C0000
R107	0x6B0000
R106	0x6A0000
R105	0x690001
R104	0x684E20
R103	0x670000
R102	0x660000
R101	0x650011
R100	0x644E20
R99	0x633D9B
R98	0x620000
R97	0x610888
R96	0x600000
R95	0x5F0000
R94	0x5E0000
R93	0x5D0000
R92	0x5C0000
R91	0x5B0000
R90	0x5A0000
R89	0x590000
R88	0x580000
R87	0x570000
R86	0x560000
R85	0x55E600
R84	0x540001
R83	0x530000
R82	0x523100
R81	0x510000
R80	0x506666
R79	0x4F0026
R78	0x4E0003
R77	0x4D0000
R76	0x4C000C
R75	0x4B0840
R74	0x4A0000
R73	0x49003F
R72	0x480001
R71	0x470081
R70	0x46C350
R69	0x450000
R68	0x4403E8
R67	0x430000
R66	0x4201F4
R65	0x410000
R64	0x401388
R63	0x3F0000
R62	0x3E0322
R61	0x3D00A8
R60	0x3C0000
R59	0x3B0001
R58	0x3A9001
R57	0x390020
R56	0x380000
R55	0x370000
R54	0x360000
R53	0x350000
R52	0x340820
R51	0x330080
R50	0x320000
R49	0x314180
R48	0x300300
R47	0x2F0300
R46	0x2E07FC
R45	0x2DC0DF
R44	0x2C1FA3
R43	0x2B00C8
R42	0x2A0000
R41	0x290000
R40	0x280000
R39	0x2703E8
R38	0x260000
R37	0x250404
R36	0x240033
R35	0x230004
R34	0x220000
R33	0x211E21
R32	0x200393
R31	0x1F43EC
R30	0x1E318C
R29	0x1D318C
R28	0x1C0488
R27	0x1B0002
R26	0x1A0DB0
R25	0x190C2B
R24	0x18071A
R23	0x17007C
R22	0x160001
R21	0x150401
R20	0x14E048
R19	0x1327B7
R18	0x120064
R17	0x11012C
R16	0x100080
R15	0x0F064F
R14	0x0E1E70
R13	0x0D4000
R12	0x0C5001
R11	0x0B0018
R10	0x0A10D8
R9	0x091604
R8	0x082000
R7	0x0740B2
R6	0x06C802
R5	0x0500C8
R4	0x040A43
R3	0x030642
R2	0x020500
R1	0x010808
R0	0x00251C

    Regards, 

    Vicente 

  • 0 in reply to vicente flores prado
    TI__Guru* 96480 points

    Hi Preston,

    Could you also get a better SPI waveform plot? Looks to me that your waveform does not have enough tCE.

  • 0 in reply to Noel Fung
    Prodigy 10 points

    I agree I think there are some timing issues I need to work out, thanks for pointing that out

  • 0 in reply to vicente flores prado
    Prodigy 10 points

    I tried using the these register values and still had no response, I think the issue had to do with the signals my FPGA is sending out

  • 0 in reply to Preston Biocevich
    TI__Mastermind 22491 points

    Let us know if adjusting the timing for your SPI fixes the issue.

    Regards,

    Vicente