Document Number: 002-14826 Rev. *G
Page 21 of 65
PRELIMINARY
CYW43903
6.4 System Boot Sequence
The following general sequence occurs after a CYW43903 is powered on:
1. Either REG_ON or HIB_REG_ON_IN is asserted.
Note:
For HIB_REG_ON_IN to function as intended, HIB_REG_ON_OUT must be connected to REG_ON.
2. The core LDO (CLDO) and LDO3P3 outputs stabilize.
3. The OTP memory bits are used to initialize various functions, such as PMU trimming, package selection, memory size selection,
etc.
4. The APP and WLAN cores are powered up.
5. The XTAL is powered up.
6. The APP and WLAN CPU bootup sequences start.