PowerPC 603, a microprocessor for portable computers

The PowerPC 603 incorporates a variety of features to reduce power dissipation: dynamic idle-time shutdown of separate execution units, low-power cache design, and power considerations for standard cells, data-path elements, and clocking. System-level features include three software-programmable static power management modes and a hardware-programmable phase-lock loop. Operating at 80 MHz, the 603 typically dissipates 2.2 W, while achieving an estimated 75 Specint92 and 85 Specfp92.>