Patent Document ID: 20080048717
Application ID: 11931772
Patent Flag: 0

Claim One:
1. A method of powering up a programmable system-on-a-chip including a programmable logic circuit block and an analog circuit block, the method comprising: ramping up a v cc voltage; producing a bandgap-good signal when the bandgap reference circuit is outputting a predetermined bandgap voltage; comparing a digital circuit voltage to the bandgap voltage to determine whether the digital circuit voltage has reached a predetermined threshold; if the digital circuit voltage has reached a predetermined threshold, determining whether the programmable logic block is functional; if the programmable logic block is functional, initializing and configuring digital circuits of the programmable system-on-a-chip; comparing an analog circuit voltage to the bandgap voltage to determine whether the analog circuit voltage has reached a predetermined threshold; if the analog circuit voltage has reached a predetermined threshold, calibrating an analog-to-digital converter.