一种改进的低功耗 NAND Flash 控制器设计

摘要

介绍了一种低功耗低成本 Nand Flash 控制器，控制器能够根据输入的命令码产生满足擦除、读写功能的时序完成相应操作。具有功耗低、面积小、电路实现简单的特点，采用中芯国际0．18μm 工艺库进行 DC 综合验证，最高工作频率可达28．5MHz，面积仅需6805μm2。32位命令码仅用到低八位，能够有效实现抗干扰，在命令码判别方面，采用改进的判别电路，将命令码进行分块比较，将命令码分成高16位和低16位，然后再细分进行比较判断，减少了计数器和移位寄存器的使用，从而减小了面积。%This paper introduces an improved NAND Flash controller which can easily realize some basic operations by generating the corresponding timing.The circuit has advantage of low power consumption,simple structure and small area size,based on SMIC 0.18μm standard CMOS process library,and works at 28.5MHz with the area of 6805μm2 .The lower -eight bits of total 32bits command code are used for increasing stability and reliability.The improved command judging circuit needs less area resource through reducing the use of counters and shift registers.