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LMK04906 Eval Board

Toshiyuki
Mastermind 7075 points
Other Parts Discussed in Thread: LMK04906, CODELOADER

Hi,

I have a question about LMK04906 Eval Board /2011-12-06 v1.0.

I can't lock PLL1 but PLL2 is locked in codeloarder4 default setup.

I attached dump list of  codeloarder4.

[SETUP]
ADDRESS=888
CLOCK=4
DATA=2
LE=6
PART=LMK04906B
PINPOSITION00=1
PINPOSITION01=7
PINPOSITION02=5
PINPOSITION03=10
[MODES]
NAME00=R0 (INIT)
VALUE00=2148925760
NAME01=R0
VALUE01=2148794688
NAME02=R1
VALUE02=2148794689
NAME03=R2
VALUE03=2148794690
NAME04=R3
VALUE04=1310787
NAME05=R4
VALUE05=1311044
NAME06=R5
VALUE06=2148794693
NAME07=R6
VALUE07=67371014
NAME08=R7
VALUE08=16842759
NAME09=R8
VALUE09=67174408
NAME10=R9
VALUE10=1431655753
NAME11=R10
VALUE11=2432844042
NAME12=R11
VALUE12=67178507
NAME13=R12
VALUE13=453771372
NAME14=R13
VALUE14=587367021
NAME15=R14
VALUE15=33554446
NAME16=R15
VALUE16=2147516431
NAME17=R16
VALUE17=3243574288
NAME18=R24
VALUE18=88
NAME19=R25
VALUE19=46777369
NAME20=R26
VALUE20=2947022874
NAME21=R27
VALUE21=268443163
NAME22=R28
VALUE22=2104860
NAME23=R29
VALUE23=25166173
NAME24=R30
VALUE24=33554782
NAME25=R31
VALUE25=2031647
OSCIN00=122.88
EXTRA_PLL_N_DIV_1_00=1
OSCIN01=122.88
EXTRA_PLL_N_DIV_1_01=1
PINS=513
[BURST]
COUNT=0

Let me knouw why PLL1 isn't lock.

Best Regards.

Kato

  • 0
    TI__Guru* 97660 points

    Hi Kato,

    Would you provide the .mac codeloader configuration file? This is a more user friendly way for us to review your setting.

  • 0 in reply to Noel Fung
    Mastermind 7075 points

    Hi Noel

    I attached .mac file of dodeloarder.

    1207.codeloarder_setup_data.zip

    Let me know why PLL1 isn't lock.

    Best Regards,

    Kato

  • 0 in reply to Toshiyuki
    TI__Guru* 97660 points

    Hi Kato,

    Your configuration is OK, how did you know PLL1 is unlock?

    Your LD pin is configured as PLL1+PLL2 DLD, if you see a HIGH on this pin, that means both PLLs are locked. You can change this setting to PLL1 DLD or PLL2 DLD to confirm which PLL is locked. You can also measure the Vtune voltage of the VCXO, it should be around 1.65V. If you see 0V or 3.3V, PLL1 is really unlocked.

    Make sure the reference clock is injected to CLKin1, input voltage should be >250mVpp. Also make sure that the freq is accurate enough. The on-board VCXO has a pull range of 20ppm only. If your reference clock freq tolerance is more than 20ppm, the VCXO will not lock.