Power management
- Power is often limited due to heat or power storage capacity
- "Low Power" desktop CPUs aren't really suitable for many
       embedded applications
  - 3-7 Watt Low Power Pentium for laptop
  - Less than 1 Watt desired for PDA
  - Less than 1 mW needed for many embedded systems (may need to
       run 30 days to 5 years on a battery)
Design Challenges:
  - Ultra-low power
  - Fast wake-up when needed
  - Low-cost perpetual power generation