METHOD AND APPARATUS FOR CONTROLLED RESET SEQUENCES WITHOUT PARALLEL FUSES AND PLL'S

摘要

A system, semiconductor device and method for providing a controlled system reset sequence with lower power consumption without dependency on fuses, PLL's and external XTAL's. A method to simplify a boot sequence by using a ring oscillator that compensates for voltage and temperature variations while also removing the dependency on parallel fuses, PLL's and external XTAL's.

主权项

1. A method for a power on sequence, comprising:
initiating a ring oscillator responsive to receiving a power up signal from a power management IC; generating a calibrated ring oscillator signal by calibrating a frequency of a ring oscillator signal with a reference clock signal; responsive to detecting a calibrated ring oscillator signal error below a predetermined threshold value:
providing the calibrated ring oscillator signal to a firmware module to execute firmware.