Research On Physical Design And Implementation Of FLASH Memory In SIM Card Chip

This paper analyzed the fast physical implementation of FLASH memory in SIM card.The characteristics of FLASH memory is data after power off will not volatile like ROM,and high efficiency of erasing and reading speed.Its power consumption is very small and has a high degree of integration.It's a large analog module that occupies half or more of the whole chip area,and its circuit design and layout have the longest cycle,so it directly affects the length of the whole chip design cycle.In this paper,NOR FLASH and NAND FLASH are compared from the aspects of performance,cost,application occasions.The principle of NOR FLASH memory cell is analyzed.According to the characteristics of NOR FLASH,a NOR FLASH circuit with capacity of 160 KB for SIM card chip which has been designed,and its layout design needs to be implemented quickly.In the layout design and implementation process,divided into ten modules according to the hierarchical structure and function of the FLASH circuit.In order to meet the requirements of Synopsys IC compiler(ICC)for the overall layout of the layout,this paper sets up the rules for the analog IP and digital IP which are divided into FLASH in ICC.After customizing the layout of the cell module,the LEF file containing the antenna information is extracted,and the database of Milkyway is established as the input file of ICC.When ICC is used for stitching FLASH top-level layout,the input and script environment of ICC is established,and the correctness and integrity of Milkyway database of each module are further verified.In the ICC layout editing interface,the manual layout of the analog IP and the division of the standard digital logic region are carried out,and the special lines such as the power ground wire,the clock signal line and so on need to be manually realized.After the automatic layout of the standard logic unit and the automatic routing of the non-special signal line,the GDS file is exported as the input file for the subsequent IP Merge work by ICC.The physical verification of FLASH mainly includes DRC,ANT(antenna),Latch,up,ERC and LVS.All inspections are required,and detailed requirements for circuit design(checklist)are also required.At this point,the physical implementation of the FLASH is finished and the physical data is checked to reach the standard for submitting data to mass production.