A 160-MHZ, 32-B, 0.5-W CMOS RISC MICROPROCESSOR

This paper describes a 160 MHz 500 mW StrongARM(R)(1) microprocessor d esigned for low-power, low-cost applications, The chip implements the ARM(R) V4 instruction set [1] and is bus compatible with earlier imple mentations. The pin interface runs at 3.3 V but the internal power sup plies can vary from 1.5 to 2.2 V, providing various options to balance performance and power dissipation, At 160 MHz internal clock speed wi th a nominal Vdd of 1.65 V, it delivers 185 Dhrystone 2.1 MIPS while d issipating less than 450 mW, The range of operating points runs from 1 00 MHz at 1.65 V dissipating less than 300 mW to 200 MHz at 2.0 V for less than 900 mW, An on-chip PLL provides the internal clock based on a 3.68 MHz clock input, The chip contains 2.5 million transistors, 90% of which are in the two 16 kB caches, It is fabricated in a 0.35-mu m three-metal CMOS process with 0.35 V thresholds and 0.25 mu m effecti ve channel lengths, The chip measures 7.8 mm x 6.4 mm and is packaged in a 144-pin plastic thin quad flat pack (TQFP) package.