CN105487969A - Smart card simulator - Google Patents

Abstract

The invention discloses a smart card simulator, which comprises a simulation chip, a management module, a SRAM (Static Random Access Memory) memory and a power module, wherein the simulation module carries out a read-write operation on the SRAM memory through a standard data/ address bus; when cold reset happens, the management module controls the simulation module to enter or quit a reset state through a control signal, and controls the power module to stop or recover power supply to the SRAM memory through the control signal; and the SRAM memory equivalently simulates an XRAM (On-Chip Expanded RAM) in the chip. The smart card simulator can equivalently realize cold reset, and guarantees that the integral function and performance of the smart card simulator can be consistent with the integral function and performance of a practical chip.

Description

Intelligent card emluator

Technical field

The present invention relates to emulator field, particularly relate to a kind of intelligent card emluator.

Background technology

Have the user program of User Exploitation in processor chips, in the writing and debug of user program, the instrument used is generally processor chips emulator.The emulation chip comprising product treatment device chip various functions is used in emulator, for the work behavior of analog equipment chip processor, emulation chip and emulator miscellaneous part (deposit the program storage of user program, the data-carrier store of store data, and the Integrated Development Environment etc. on user computer) coordinate and realize the simulation run of user program and every debug function.

Usually SRAM (StaticRandomAccessMemory is adopted in emulator, static RAM) carry out the XRAM (on-chipexpandedRandomAccessMemory being used as data-carrier store in equivalent substitution product chips, expansion static RAM in sheet), when writing, reading data, functional performance is all equivalent.

Intelligent card chip coordinates in card reader use procedure, power supply is obtained from card reader, namely contact intelligent card obtains power supply from the energization pins of contact card reader, the carrier wave that contact type intelligent card sends from contactless card reader obtains power supply, and intelligent card chip itself does not have oneself power supply.In actual applications, card reader can pass through switch contact power supply or contactless power supply carrier wave, makes intelligent card chip carry out cold reset, namely re-powers after intelligent card power failure and start working.Because cold reset is that chip re-powers, therefore XRAM in chip is the same with common XRAM, and the data before power down can be lost, and the data re-powered in rear XRAM all can become not expected random value.On intelligent card emluator, after card reader initiates cold reset, in intelligent card emluator, be equivalent to an electrification reset process, program execution pointer, register value etc. can get back to electrification reset value, and this is consistent with actual chips state.But, because card reader cannot provide enough power consumptions, intelligent card emluator all uses oneself independent current source to power, like this owing to there is no genuine power down and re-powering process, but done and once reset, the XRAM content in intelligent card emluator can not change, still the same with the data that card reader is initiated before power down, this just causes on emulator inconsistent with the function of actual chips, affects the application of personal code work.If by simulator components after card reader initiates power down, the all data modifications in XRAM region in emulator are become random value, although functionally can accomplish consistent with actual chips, but because XRAM capacity is increasing, this modification process caused emulator consuming time and chip differences very important and increasing, so this method inadvisable.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of intelligent card emluator, equivalence can realize cold reset, ensures that intelligent card emluator allomeric function, performance are consistent with actual chips.

For solving the problems of the technologies described above, the intelligent card emluator of equivalent cold reset of the present invention, comprises emulation chip, administration module, SRAM memory, power module; XRAM in SRAM memory equivalent simulation chip;

Described emulation chip carries out read-write operation by normal data/address bus to SRAM memory, the function of analog chip inner treater operation XRAM; When there is cold reset, after card reader cut-out contact is powered or closed contactless carrier wave, administration module enters reset mode by control signal control imitation chip, controls power module stop powering to SRAM memory by control signal; After the card reader formula of resuming contacts is powered or opened contactless carrier wave, administration module exits reset mode by control signal control imitation chip, controls power module recover to power to SRAM memory by control signal.

Intelligent card emluator of the present invention equivalence can realize cold reset, data in emulator XRAM before cold reset can be lost, data after cold reset in XRAM all can become not expected random value, functionally be consistent with actual chips, and also basically identical in performance, ensure that the consistance of intelligent card emluator allomeric function, performance and actual chips; Facilitate the exploitation of user program, debugging and test.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:

Accompanying drawing is the structural representation of described intelligent card emluator.

Embodiment

As shown in the figure, described intelligent card emluator 1, comprises emulation chip 2, administration module 3, SRAM memory 4, power module 5.Described SRAM memory 4 is connected with emulation chip 2 by normal data/address bus 6, the XRAM in equivalent simulation chip.Administration module 3 is controlled emulation chip 2 and power module 5 respectively by control signal 7.Power module 5 is connected with SRAM memory 4 by supply lines 8, powers to SRAM memory 4.SRAM memory is the same with XRAM, and have after power down re-powers, the data in it all can become the characteristic of not expected random value.

Emulation chip 2 carries out read-write operation by normal data/address bus 6 pairs of SRAM memory, the function of analog chip inner treater operation XRAM.When there is cold reset, after card reader cut-out contact is powered or closed contactless carrier wave, administration module 3 enters reset mode by control signal 7 control imitation chip 2, controls power module 5 stop powering to SRAM memory by control signal 7; After the card reader formula of resuming contacts is powered or opened contactless carrier wave, administration module 3 exits reset mode by control signal 7 control imitation chip 2, controls power module 5 recover to power to SRAM memory 4 by control signal 7.

Like this, after cold reset, for user program in intelligent card emluator 1, program execution pointer, register value etc. have all got back to electrification reset value, and the data in XRAM have also changed over random value, are functionally consistent with actual chips state.Meanwhile, in cold reset process, power module 5 just does once to stopping and the action that restores electricity of SRAM memory 4, consuming time and actual chips cold reset time consistency, also ensure that intelligent card emluator 1 in cold reset performance with the consistance of actual chips.

The foregoing is only the specific embodiment of the present invention and embodiment, scope is not limited thereto.

Claims (1)

1. an intelligent card emluator, is characterized in that: comprise emulation chip, administration module, SRAM memory, power module; XRAM in SRAM memory equivalent simulation chip;

Described emulation chip carries out read-write operation by normal data/address bus to SRAM memory, the function of analog chip inner treater operation XRAM; When there is cold reset, after card reader cut-out contact is powered or closed contactless carrier wave, administration module enters reset mode by control signal control imitation chip, controls power module stop powering to SRAM memory by control signal; After the card reader formula of resuming contacts is powered or opened contactless carrier wave, administration module exits reset mode by control signal control imitation chip, controls power module recover to power to SRAM memory by control signal.