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LMX2615-SP: Programming sequence questions

Part Number: LMX2615-SP


Hi,

Concerning sub section "7.5.1 Recommended Initial Power-Up Sequence" from the datasheet. 

1) For step 2. Program RESET=1 for register R0. Is then readback disabled when reset is asserted? We always readback zero's when reset is asserted.
For step 3. We readback the configuration of register R0 when reset is deasserted.
Therefore we assume that readback of register is disabled once reset is asserted. Is this assumption valid?

2) For step 4.  Programming of registers.
Concerning the sentence "Programming of registers R113 down to R76 is not required, but if they are programmed, they should be done so as the register map shows". 

Some of the registers in the aforementioned span are only readable (as e.g. R113). Therefore, why should we then program these registers when they are read only? 
Can we program R114 and jump to register R75, and program all register down to R0, or does we violate with the recommend sequence of program the registers. 

Best Regards,
Ole-Georg

  • Hi Ole, 
    Readback during RESET readback is unavailable given reset will return revert all registers and state machines to default. & RESET must be toggled back to 0 remove the "reset."

    Read only registers are write protected. Some customers will program the device registers sequentially all the way from R114 down to R0.

    Programming of R114 and from R75 to R0 is valid.  R114 programming only required to change states for WD_CNTRL or WD_DLD. If programming of R114 not required then programming only from R75 to R0 is also valid.