SNAA421 November   2025 LMK05318B , LMK5B12204 , LMK5B33216 , LMK5B33414 , LMK5C33216A , LMK5C33414A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Start Here: Using TICS Pro for Configuration and Readback
    1. 1.1 TICS Pro Status Page
    2. 1.2 TICS Pro Default Setting
  5. 2Debug Procedure: From Device Start-Up to Locked Output State
    1. 2.1 Is the APLL Reference Valid?
      1. 2.1.1 Check Status of APLL Reference
      2. 2.1.2 Debug APLL Reference
    2. 2.2 Is the APLL Locked?
      1. 2.2.1 Check Status of APLL Lock
      2. 2.2.2 Debug APLL Lock
    3. 2.3 Is the DPLL Reference Valid?
      1. 2.3.1 Check Status of DPLL Reference Validation
      2. 2.3.2 Debug DPLL Reference Validation
    4. 2.4 Is the DPLL Selecting a Reference?
      1. 2.4.1 Check Status of DPLL Reference Selection
      2. 2.4.2 Debug DPLL Reference Selection
    5. 2.5 Is the DPLL Frequency Locked?
      1. 2.5.1 Check Status of DPLL Frequency Lock
      2. 2.5.2 Debug DPLL Frequency Lock
    6. 2.6 Is the DPLL Phase Locked?
      1. 2.6.1 Check Status of DPLL Phase Lock
      2. 2.6.2 Debug DPLL Phase Lock
  6. 3Summary
  7. 4References

2.4.1 Check Status of DPLL Reference Selection

The LMK device has a DPLL reference selector that chooses one valid DPLL reference to use for DPLL lock. The selected DPLL input is reported through the "DPLL Reference Selection" status bits as described in Table 2-13. Table 2-11 shows the DPLL reference selection status registers for the LMK device families.

Table 2-13 DPLL Reference Selection - Status Bits Definition
BIT[n:0] STATEMEANINGDESCRIPTION
0Undesired resultThe DPLL reference valid bit is cleared when the DPLL is in holdover. There is not one valid reference input and/or the DPLL register settings are incorrect.
> 0Desired resultThe DPLL reference valid bit is greater than 0 when the DPLL is locked to the input clock specified by the status value.(1) There is at least one valid reference input.
(1) Refer to the LMK device programming manual for the full list of options.
Table 2-14 DPLL Reference Selection - Status Register
DEVICE FAMILYTICS PRO FIELD NAMEDPLL REFERENCE SELECTION
REGISTER
BAW DPLLDPLL2DPLL1(1)
LMK05318B, LMK05318DPLL_REFSEL_STATR167[1:0]N/AN/A
LMK5B, LMK5CA, LMK5CDPLLx_REFSEL_STATR527[5:0]R377[5:0]R227[5:0]
(1) Column is not applicable for LMK5B12212 or LMK5C22212A.