Soft mask card based on high-capacity EEPROM

Abstract

The invention discloses a soft mask card based on a high-capacity EEPROM, which comprises a memory unit, a data address bus and an MCU unit. The memory unit comprises an on-chip memory and an off-chip memory; the on-chip memory comprises an ROM unit for storing a Bootloader program, an EEPROM unit for storing a COS program, and an IRAM unit for storing intermediate data; the off-chip memory comprises an XRAM unit served as an off-chip data memory of an MCU, an expansion EEPROM unit served as a nonvolatile data memory of the MCU, and an XREG unit served as a communication interface of the MCU and peripheral equipment and used for an expansion 3DES co-processor, a random number generator and the like; the EEPROM unit comprises an EEPROM-C unit for storing the COS program and an EEPROM-D unit provided with a Proflag sign and judging whether to enter the COS program or to update the COS program; the address of the ROM unit is connected with a rom_addr when the ROM unit is in a normal mode, and the ROM unit adopts an rom_bus to read program storage space; the address of the ROM unit is connected with an xdat_addr when the ROM unit is in a programming mode, and the ROM unit adopts an xdat_wr_rom of an xdat_bus to write the program storage space; and the two modes are selected through a WRS of an SPC_FNC register.

Description

technical field [0001] The invention relates to a smart card chip, in particular to a soft mask card based on a large-capacity EEPROM. Background technique [0002] An integrated circuit (Integrated Circuit) is a microelectronic device or component that uses a certain process to interconnect components such as transistors, diodes, resistors, capacitors, and inductors required in a circuit, and interconnects them in a small or Several small semiconductor wafers or dielectric substrates are packaged in a package to become a microstructure with the required circuit functions. [0003] Smart Card (Smart Card) is a general term for plastic cards embedded with integrated circuit chips. IC cards can be divided into three categories according to different types of chips: memory cards, logical encryption cards and CPU cards. Only CPU cards are the real meaning. The integrated circuit in the smart card (CPU card) includes a central processing unit (CPU), an electrically erasable prog...

AI Technical Summary

Problems solved by technology

[0005] At present, for the on-chip operating system COS of the smart card, the system program is generally solidified into the ROM. This method of program storage is generally called "hard mask". However, this method makes the modification of the program inflexible, resulting in the following insufficient:

[0006] 1) It makes the user's pre-debugging more difficult;

[0007] 2) Increase the risk of user research and development;

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