A Micro-Watt Multi-port Register File with Wide Operating Voltage Range

In this paper, a micro-watt multi-port register file with wide operating voltage range for micro-power applications is presented. Multibank architecture for simultaneous access with collision detecting technique is proposed. The architecture has been analyzed under wide operating voltage range between 1 V to 0.25 V with varies process corner. Negative voltage write scheme ensures successful write in deep sub-threshold region. Also, an improved read buffer footer and controllable pre-charge in read scheme are designed. A 4W/4R 16 KB register file is implemented in UMC 90 nm CMOS technology. The simulation results show that the maximum active power of multi-port register file can achieve near 22.3-22.9 uW at 485 KHz under 0.25 V.