Method capable of smartly implementing EEPROM simulation function in chip

Abstract

This invention relates to a flexible method to realize the EEPROM artificial function. The artificial chip of intelligent card comprises the storage application extension procedure EEPROM. The artificial device comprises substitute artificial chip EEPROM SRAM. There is set with option signals between the artificial device and artificial chip. When adjusting the above application procedure code content, the option signal-informing chip downloads the extension procedure into the artificial SRAM to substitute the EEPROM for adjusting.

Description

technical field [0001] The invention relates to the field of smart card hardware emulation systems, in particular to a method for a smart card emulator to realize an on-chip EEPROM emulation function. Background technique [0002] The structure of the MCU used in smart card products is different from that of general-purpose MCU chips. In addition to the PROM used to store the on-chip operating system (COS program), the on-chip memory generally has a large-capacity on-chip EEPROM. This part of EEPROM can be used as a non-volatile memory to store some fixed data, and can also be used as a program memory to store application expansion programs when needed, such as in the expansion of multiple applications. [0003] The process of using the on-chip EEPROM as the program area is that first, the EEPROM is used as the data area (XRAM), and the HEX file compiled separately for the application expansion program is placed in the designated area of ​​the on-chip EEPROM by means of data...

AI Technical Summary

Problems solved by technology

Because there are large or small differences in the operation timing of EEPROMs of different models and capacities produced by various companies, the external EEPROM of the smart card emulator must be guaranteed to use the same process as the on-chip EEPROM and have exactly the same operation. Timing, because there is no external EEPROM chip that can replace all types of EEPROM, objectively greatly limits the choice of the emulator to replace the EEPROM model, and limits the smart card emulator to the same series of EV-CHIP (these chips may There are only differences in the operation timing of EEPROM), which brings great inconvenience to the use of smart card emulators

[0006] In addition, if the smart card emulator uses an external EEPROM to replace the on-chip EEPROM for emulation debugging, since the operating speed of EEPROM is much slower than that of SRAM, and in the debugging process of the application extension program in EEPROM, most of the debugging process The concern is the program itself, too slow execution speed will greatly affect the efficiency of debugging work

Images