Integrated circuit safety detection system
Through the high-precision resistor module and signal amplification module in the integrated circuit safety detection system, the current and voltage changes in the integrated circuit are detected, which solves the problem of difficult to detect hardware Trojans in the prior art, and improves the reliability and efficiency of detection.
Patent Information
- Application Number
- CN202210163824.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-02-22
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2042-02-22
AI Technical Summary
The prior art is difficult to accurately detect whether hardware Trojans are implanted in integrated circuits, resulting in insufficient reliability of integrated circuit safety detection.
Provide an integrated circuit safety detection system, including a high-precision resistor module, a signal amplification module and a processor, is connected to the integrated circuit to be tested through a high-precision resistor module, the signal amplification module amplifies the voltage signal, and is connected to the oscilloscope for detection circuits. The current, voltage and power consumption are determined by determining whether there is a Trojan circuit.
It improves the reliability and efficiency of integrated circuit safety detection, can accurately measure small voltage changes, and accurately analyze whether there is a Trojan circuit in the integrated circuit to be tested.
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Figure CN114509979B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of integrated circuits, and in particular to an integrated circuit safety detection system. Background Art
[0002] With the rapid development of semiconductor manufacturing technology and computer-aided design technology, integrated circuits are widely used in various fields and have become an indispensable part of people's lives. Therefore, the security of integrated circuits is very important. At present, there are few hardware platforms specifically for integrated circuit security detection on the market. Generally, they are general-purpose FPGA (Field Programmable Gate Array) development boards, which cannot accurately measure whether hardware Trojans are implanted in integrated circuits.
[0003] Therefore, how to improve the reliability of integrated circuit safety detection is a technical problem that needs to be solved in this field. Summary of the invention
[0004] In view of this, the purpose of the present application is to provide an integrated circuit security detection system, which can improve the reliability of integrated circuit security detection.
[0005] To achieve the above purpose, this application has the following technical solutions:
[0006] The embodiment of the present application provides an integrated circuit safety detection system, including: a high-precision resistor module, a signal amplification module and a processor; the high-precision resistor module includes a high-precision resistor;
[0007] The processor is connected to the integrated circuit to be tested and is used to run the integrated circuit security detection strategy;
[0008] The high-precision resistance module is connected to the integrated circuit to be tested; the high-precision resistance module is also connected to the signal amplification module and the processor;
[0009] The signal amplifying module is used to amplify the voltage of the high-precision resistor; the signal amplifying module is connected to an oscilloscope.
[0010] In a possible implementation, the high-precision resistor module includes a jumper; the jumper connects the first path and the second path;
[0011] The first path is directly connected to the main power switch;
[0012] The second path is connected in series with the high-precision resistor and then connected to the main power switch.
[0013] In a possible implementation, the system further includes: a peripheral interface circuit module and a power management module;
[0014] The peripheral interface circuit module includes: a double rate synchronous dynamic random access memory, a NAND flash memory and a six-wire serial peripheral interface flash memory, which are used to connect to the processor respectively;
[0015] The power management module is connected to the processor and the peripheral interface circuit module respectively, and is used to supply power to the processor and the peripheral interface circuit module respectively.
[0016] In a possible implementation, the system further includes: a data communication interface module;
[0017] The data communication interface module includes: a universal serial bus joint test working group interface, a universal serial bus universal asynchronous receiver and transmitter debugging interface and an Ethernet interface, which are used to connect with the processor respectively.
[0018] In a possible implementation, the system further includes: a reverse flash card interface, which is used to connect to the processor to store user data.
[0019] In a possible implementation, the system further includes: an organic light emitting diode display module, which is used to connect to the processor to facilitate user input of signals.
[0020] In a possible implementation, the processor includes: a processing system module and a programmable logic module;
[0021] The processing system module includes: a dual-core central processing unit; the programmable logic module includes: a field programmable logic gate array.
[0022] In a possible implementation, the programmable logic module is connected to the indicator light module, the switch module and the key module respectively.
[0023] In a possible implementation, the main power switch is a single-pole double-throw switch.
[0024] In a possible implementation, the system further includes:
[0025] a system reset module and a mode configuration module respectively connected to the processor;
[0026] The system reset module is used to provide system reset for the processor;
[0027] The mode configuration module is used to configure the startup mode of the system.
[0028] The embodiment of the present application provides an integrated circuit security detection system, including: a high-precision resistor module, a signal amplification module and a processor, the high-precision resistor module includes a high-precision resistor, the processor is connected to the integrated circuit to be tested, and is used to run the integrated circuit security detection strategy, the high-precision resistor module is connected to the integrated circuit to be tested, and the high-precision resistor module is also connected to the signal amplification module, the signal amplification module is used to amplify the voltage of the high-precision resistor, and the signal amplification module is connected to an oscilloscope. That is, a hardware platform specifically for integrated circuit security detection is provided, which can better meet the needs of current integrated circuit security detection and reduce unnecessary modules. By adding a high-precision resistor module and a signal amplification module, the voltage value of the high-precision resistor is accurately measured and amplified, so that the presence of a Trojan circuit in the integrated circuit to be tested can be accurately observed and analyzed based on the change of the tiny voltage value of the high-precision resistor, thereby improving the reliability and efficiency of integrated circuit security detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0030] Figure 1 A schematic diagram of an integrated circuit safety detection system provided by an embodiment of the present application is shown;
[0031] Figure 2 A schematic diagram of a high-precision resistor module provided in an embodiment of the present application is shown;
[0032] Figure 3 A schematic diagram of a signal amplification module provided in an embodiment of the present application is shown;
[0033] Figure 4 A schematic diagram of another integrated circuit security detection system provided by an embodiment of the present application is shown;
[0034] Figure 5 A schematic diagram of voltage conversion provided by an embodiment of the present application is shown. DETAILED DESCRIPTION
[0035] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.
[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.
[0037] As described in the background technology, with the rapid development of semiconductor manufacturing technology and computer-aided design technology, integrated circuits are widely used in various fields and have become an indispensable part of people's lives. Therefore, the security of integrated circuits is very important. At present, there are few hardware platforms specifically for integrated circuit security detection on the market. Generally, they are general-purpose FPGA (Field Programmable Gate Array) development boards, which cannot accurately measure whether hardware Trojans are implanted in integrated circuits.
[0038] Therefore, how to improve the reliability of integrated circuit safety detection is a technical problem that needs to be solved in this field.
[0039] In order to solve the above technical problems, the embodiment of the present application provides an integrated circuit security detection system, including: a high-precision resistor module, a signal amplification module and a processor, the high-precision resistor module includes a high-precision resistor, the processor is connected to the integrated circuit to be tested, and is used to run the integrated circuit security detection strategy, the high-precision resistor module is connected to the integrated circuit to be tested, and the high-precision resistor module is also connected to the signal amplification module, the signal amplification module is used to amplify the voltage of the high-precision resistor, and the signal amplification module is connected to an oscilloscope. That is, a hardware platform specifically for integrated circuit security detection is provided, which can better meet the needs of current integrated circuit security detection and reduce unnecessary modules. By adding a high-precision resistor module and a signal amplification module, the voltage value of the high-precision resistor is accurately measured and amplified, so that the presence of a Trojan circuit in the integrated circuit to be tested can be accurately observed and analyzed based on the tiny changes in the voltage value of the high-precision resistor, thereby improving the reliability and efficiency of integrated circuit security detection.
[0040] Exemplary Systems
[0041] See also Figure 1 As shown, an integrated circuit safety detection system provided in an embodiment of the present application includes: a high-precision resistor module 2, a signal amplification module 3 and a processor 1.
[0042] The high-precision resistor module 2 includes a high-precision resistor. The processor 1 is connected to the integrated circuit to be tested (not shown in the figure) and is used to run the integrated circuit safety detection strategy. The high-precision resistor module 2 is connected to the integrated circuit to be tested. The high-precision resistor module 2 is also connected to the signal amplification module 3 and the processor 1. The signal amplification module 3 is used to amplify the voltage of the high-precision resistor 2. The signal amplification module 3 is connected to an oscilloscope.
[0043] In the embodiment of the present application, the high-precision resistor module 2 includes high-precision resistors. High-precision resistors are resistors that require indicators such as resistance error, thermal stability, and distribution parameters of resistors to meet certain standards. The resistance error of ordinary resistors is more than 1%, while the error of high-precision resistors can be as low as 0.1% or even lower.
[0044] Generally speaking, if there is an abnormal circuit hidden in the IC to be tested, there will be power consumption after the circuit is started. We can collect the current and voltage data of the circuit, analyze the current, voltage, power consumption, etc. of the circuit, and compare it with the control circuit to determine whether there is an abnormality and whether there are safety hazards. Since the relevant parameters of the control circuit change very little, this method requires high accuracy, so it is necessary to select high-precision resistors to collect the current and voltage data of the circuit.
[0045] Specifically, a signal amplification module 3 can be used to amplify the voltage of a high-precision resistor. The signal amplification module 3 is connected to an oscilloscope, that is, a bypass signal detection method can be used to detect the security of the integrated circuit to be detected, that is, to analyze whether there is a Trojan circuit through changes in external physical parameters such as power consumption (static and dynamic), signal delay, and electromagnetic field. Static and dynamic test vector tests are performed by controlling the access level of the input pin, and an oscilloscope is used to measure the voltage drop across the high-precision resistor at the total input end of the power supply, and the corresponding static / dynamic current values are calculated, thereby calculating the total power consumption of the circuit.
[0046] In one possible implementation, see Figure 2 As shown, the high-precision resistor module 2 includes a jumper JP0, which connects the first path A and the second path B. The other end of the jumper can be connected to CN1DC_JACK, that is, a DC power socket. The first end of the DC power socket CN1 DC_JACK is connected to the power supply and the jumper JP0, and the second and third ends of the DC power socket CN1 DC_JACK are grounded.
[0047] The first path A is directly connected to the main power switch S0, and the second path B is connected in series with the high-precision resistor R0 and then connected to the main power switch S0. When bypass signal detection is required, that is, when the voltage across the high-precision resistor R0 needs to be detected, the second path B is turned on, and the voltage drop across the high-precision resistor R0 is measured to collect relevant information, that is, the voltage drop from +Vin to -Vin is measured; when bypass signal detection is not required, the first path can be used, and the power directly enters the system through the main power switch S0.
[0048] In a possible implementation, the main power switch S0 may be a single-pole double-throw switch, see Figure 2As shown, in the above two methods, the main power switch S0 is located at point 1 of the single-pole double-throw switch; when the integrated circuit safety detection system provided in the embodiment of the present application is not needed for testing, the single-pole double-throw switch can be placed at point 3, and the system is in a power-off state.
[0049] In one possible implementation, see Figure 3 As shown, it is a schematic diagram of a signal amplification module 3 provided in an embodiment of the present application. Considering that the voltage signal changes slightly, the voltage signal is amplified by a voltage amplifier (AD8000). AD8000 is an ultra-high-speed, high-performance, current feedback amplifier, and its output signal distortion is low, the bandwidth is up to 1.5GHz, the input offset voltage is 1mV, and the differential gain is 0.02%. It has two power supply modes, namely unipolar power supply and bipolar power supply. Since its performance will be reduced in the unipolar power supply mode, in the present invention, a ±5V bipolar power supply is used to power it. The bipolar power supply is powered by WRA1205MD-6W, and a jumper JP1 is set, which can be set to disconnect when the voltage signal does not need to be measured. The gain of the AD8000 output signal is determined by the resistance values of resistors R1 and R2 in the figure. The gain of the AD8000 output signal can be adjusted by adjusting the resistance values of R1 and R2. In the present invention, the gain can be set to 20.
[0050] The +Vin and -Vin at both ends of the high-precision resistor R0 are connected to the +IN terminal and -IN terminal of AD8000 respectively. The FB terminal of AD8000 can be connected to the first capacitor C1 and the first resistor R1 in parallel, and then connected in series with the second resistor R2. The second resistor R2 is connected to the -IN terminal, the third resistor R3 is connected to the +IN terminal, the second capacitor C2 and the third capacitor C3 are connected in parallel to the -Vs terminal of AD8000 and then grounded, wherein the third capacitor C3 is a polar capacitor, and the PD terminal of AD8000 and the +Vs terminal are connected in parallel and then connected to the fourth capacitor C4 and the fifth capacitor C5 in parallel and then grounded, wherein the fourth capacitor C4 It is a polarized capacitor. The OUTPUT of AD8000 is connected to Vout, the NC of AD8000 is an empty terminal, the 1st terminal of the bipolar power supply WRA1205MD-6W is grounded, and the 2nd terminal is respectively connected to the seventh capacitor C7 and the jumper JP1, and the jumper JP1 is connected to the power supply. Specifically, the power supply can be 12V, the 3rd terminal is connected to +V0, specifically 5V, the 4th terminal is grounded, the 5th terminal is connected to -V0, i.e. -5V, and the 5th terminal can also be connected to the sixth capacitor C6 and then grounded, wherein the sixth capacitor C6 is a polarized capacitor, and the 3rd terminal can also be connected to the eighth capacitor C8 and then grounded, wherein the eighth capacitor C8 is a polarized capacitor. A fourth resistor R4 can also be connected between Vout and ground.
[0051] It should be noted that the sizes of the above-mentioned resistors and capacitors can be set according to the amplification factor of the signal amplification module, and the embodiment of the present application does not make any specific limitation thereto.
[0052] In one possible implementation, see Figure 4 As shown, the system provided in the embodiment of the present application further includes: a peripheral interface circuit module 4 and a power management module 5,
[0053] The peripheral interface circuit module 4 includes: a double data rate synchronous dynamic random access memory 41 (DDR3 SDRAM, Double Data Rate Synchronous Dynamic Random Access Memory), a NAND flash memory 42 (NAND Flash) and a six-wire serial peripheral interface flash memory 43 (QSPI Flash, Quad Serial Peripheral Interface Flash), which are used to connect to the processor 1 respectively.
[0054] The power management module 5 is connected to the processor 1 and the peripheral interface circuit module 4 respectively, and is used to supply power to the processor 1 and the peripheral interface circuit module 4 respectively.
[0055] Among them, optionally, the double-rate synchronous dynamic random access memory 41 can be two chips with a maximum addressing space of 1GB, the NAND flash memory 42 supports NAND FLASH startup, and is used to store Uboot (universal boot loader, U-Boot), kernel and file system, and the six-wire serial peripheral interface flash memory chip is started in six-wire serial peripheral interface flash memory mode to store user programs.
[0056] Optionally, the power management module 5 can supply power to the processor 1 and the peripheral interface circuit module 4 separately, and can shut down the power supply of the peripheral interface circuit when the peripheral interface is not in use.
[0057] Optionally, the total input voltage of the power supply of the integrated circuit safety detection system provided in the embodiment of the present application is 12V. The input power management module is used to stabilize the input voltage to the operating voltage of each chip in the system. In the embodiment of the present application, the required voltages mainly include 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.0V and 0.75V, a total of seven voltages. For example, the voltage used by the double rate synchronous dynamic random access memory 41 can be 2.5V, see Figure 5As shown, voltage conversion chips such as MAX8686ETL, TPS65261, TPS51206, MAX15021, and TLV62130 can be used to achieve voltage conversion. The MAX8686ETL chip converts the 12V voltage into the 5V voltage, the TPS65261 chip converts the 5V voltage into the 3.3V, 1.8V, or 1.5V voltage, the TPS51206 converts the 3.3V voltage into the 0.75V voltage, the MAX15021 converts the 5V voltage into the 2.5V or 3.3V voltage, and the TLV62130 converts the 5V voltage into the 1.0V voltage, thereby achieving voltage conversion and stabilizing the input voltage to the operating voltage of each chip in the system.
[0058] In one possible implementation, see Figure 4 As shown, the system provided by the embodiment of the present application may also include: a data communication interface module 6.
[0059] Specifically, the data communication interface module 6 includes: a universal serial bus joint test working group interface 61 (USB-JTAG, Universal Serial Bus-Joint Test Action Group), a universal serial bus universal asynchronous receiver / transmitter debugging interface 62 (USB-UART, Universal Serial Bus-Universal Asynchronous Receiver / Transmitter) and an Ethernet interface 63, which are used to connect to the processor 1 respectively.
[0060] The data communication interface module 6 can be connected to an external PC (Personal Computer). The user can program and debug the software of the processor 1 through the data communication interface. The universal serial bus universal asynchronous receiver and transmitter debugging interface 62 converts the serial port UART of the processor into a USB debugging interface for the convenience of user debugging. The user can output debugging print information through this interface. The Ethernet interface provides a 10 / 100 / 1000M adaptive network interface, a built-in network transformer, and two yellow and green status indicators to realize the data transmission between the PC data and the hardware platform.
[0061] In one possible implementation, see Figure 4 As shown, the system provided in the embodiment of the present application also includes: a trans-flash card (Trans-Flash, TF) interface 7, which is used to connect to the processor 1 to store user data.
[0062] In one possible implementation, see Figure 4As shown, the system provided in the embodiment of the present application also includes: an organic light-emitting diode display (OLED, Organic Light-Emitting Diode) module 8, which is used to connect to the processor 1 to facilitate user input of signals. The organic light-emitting diode display module 8 is a monochrome passive display screen, which is connected to the organic light-emitting diode display module 8 through a serial peripheral interface.
[0063] In one possible implementation, see Figure 4 As shown, the processor 1 includes: a processing system module 11 and a programmable logic module 12 .
[0064] The processing system module 11 includes: a dual-core central processing unit, and the programmable logic module 12 includes: a field programmable gate array (FPGA, Field Programmable Gate Array).
[0065] Optionally, the processor 1 provided in the embodiment of the present application may be a ZYNQ XC7Z020 processor, which performs functions such as communication, information processing, operation of security detection strategies, system control, and storage. The dual-core central processing unit may be an ARM, and the maximum frequency of the dual-core central processing unit is 667MHz. It may be connected to interfaces such as a DDR controller, a QSPI controller, an SD controller, SPI, a UART, and Ethernet, so as to facilitate connection and communication with external devices. The field programmable gate array has a rich set of programmable GPIOs and configurable logic blocks, which may be used to expand switch input and output such as LED indicators, user switches, and buttons.
[0066] In one possible implementation, see Figure 4 As shown, the programmable logic module 12 is connected to the indicator light module 91 , the switch module 92 and the key module 93 respectively.
[0067] Optionally, the embodiment of the present application provides 8 user-available GPIO (General Purpose InputOutput) interface buttons; 8 user switches facilitate user signal input, the toggle switch can connect the corresponding IO pins to the power supply, and 8 LED indicator lights, the logic high level of the pin will light up the corresponding LED.
[0068] In one possible implementation, see Figure 4 As shown, the system also includes:
[0069] A system reset module 94 and a mode configuration module 95 connected to the processor 1 respectively,
[0070] The system reset module 94 is used to provide system reset for the processor 1, and the mode configuration module 95 is used to configure the startup mode of the system.
[0071] Optionally, in an embodiment of the present application, a power-on reset is provided to a processor using a reset chip to reset the system; and a mode configuration is used to set the system startup mode through five single-row pins.
[0072] The embodiment of the present application provides an integrated circuit safety detection system, including: a high-precision resistor module, a signal amplification module and a processor, the high-precision resistor module includes a high-precision resistor, the processor is connected to the integrated circuit to be tested, and is used to run the integrated circuit safety detection strategy, the high-precision resistor module is connected to the integrated circuit to be tested, and the high-precision resistor module is also connected to the signal amplification module, the signal amplification module is used to amplify the voltage of the high-precision resistor, and the signal amplification module is connected to an oscilloscope. That is, a hardware platform specifically for integrated circuit safety detection is provided, which can better meet the needs of current integrated circuit safety detection and reduce unnecessary modules. By adding a high-precision resistor module and a signal amplification module, the voltage value of the high-precision resistor is accurately measured and amplified, so that the presence of a Trojan circuit in the integrated circuit to be tested can be accurately observed and analyzed according to the change of the tiny voltage value of the high-precision resistor, thereby improving the reliability and efficiency of integrated circuit safety detection, and having the advantages of small size, high efficiency, small interference, and accurate measurement data.
[0073] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.
[0074] The above is only a preferred implementation of the present application. Although the present application has been disclosed as a preferred embodiment, it is not intended to limit the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of protection of the technical solution of the present application.
Claims
1. An integrated circuit safety detection system, characterized in that: include: High-precision resistance module, signal amplification module and processor; The high-precision resistor module includes a high-precision resistor; The processor is connected to the integrated circuit to be tested and is used to run the integrated circuit security detection strategy; The high-precision resistance module is connected to the integrated circuit to be tested; the high-precision resistance module is also connected to the signal amplification module and the processor; The signal amplification module is used to amplify the voltage of the high-precision resistor; the signal amplification module is connected to an oscilloscope; The high-precision resistor module includes a jumper; the jumper connects the first path and the second path; The first path is directly connected to the main power switch; The second path is connected in series with the high-precision resistor and then connected to the main power switch; The signal amplification module includes a voltage amplifier AD8000, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8; wherein the third capacitor C3 is a polar capacitor, the fourth capacitor C4 is a polar capacitor, the sixth capacitor C6 is a polar capacitor, and the eighth capacitor C8 is a polar capacitor; the gain of the AD8000 output signal is determined by the resistance values of the first resistor R1 and the second resistor R2, and the gain of the AD8000 output signal is adjusted by adjusting the resistance values of the first resistor R1 and the second resistor R2; the sizes of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 are set according to the amplification factor of the signal amplification module; The +Vin and -Vin at both ends of the high-precision resistor are connected to the +IN and -IN ends of AD8000 respectively. The FB end of AD8000 is connected to the first capacitor C1 and the first resistor R1 in parallel, and then connected in series with the second resistor R2. The second resistor R2 is connected to the -IN end, and the third resistor R3 is connected to the +IN end. The second capacitor C2 and the third capacitor C3 are connected in parallel to the -Vs end of AD8000 and then grounded. The PD end of AD8000 and the +Vs end are connected in parallel to the fourth capacitor C4 and the third capacitor C5 in parallel. The fifth capacitor C5 is connected to ground, the OUTPUT output terminal of AD8000 is connected to Vout, the NC terminal of AD8000 is the empty terminal, the 1 terminal of the bipolar power supply WRA1205MD-6W is grounded, the 2 terminal is respectively connected to the seventh capacitor C7 and the jumper JP1, the jumper JP1 is connected to the power supply, the 3 terminal is connected to +V0, the 4 terminal is grounded, the 5 terminal is connected to -V0, the 5 terminal is also connected to the sixth capacitor C6 and then to ground, the 3 terminal is also connected to the eighth capacitor C8 and then to ground, and a fourth resistor R4 is also connected between Vout and ground.
2. The system according to claim 1, characterized in that The system also includes: a peripheral interface circuit module and a power management module; The peripheral interface circuit module includes: a double rate synchronous dynamic random access memory, a NAND flash memory and a six-wire serial peripheral interface flash memory, which are used to connect to the processor respectively; The power management module is connected to the processor and the peripheral interface circuit module respectively, and is used to supply power to the processor and the peripheral interface circuit module respectively.
3. The system according to claim 1, characterized in that The system further comprises: a data communication interface module; The data communication interface module includes: a universal serial bus joint test working group interface, a universal serial bus universal asynchronous receiver and transmitter debugging interface and an Ethernet interface, which are used to connect with the processor respectively.
4. The system according to claim 1, characterized in that The system further comprises: a reverse flash memory card interface, which is used to connect with the processor to store user data.
5. The system according to claim 1, characterized in that The system further comprises: an organic light emitting diode display module, which is used to connect with the processor to facilitate user input of signals.
6. The system according to claim 1, characterized in that The processor includes: a processing system module and a programmable logic module; The processing system module includes: a dual-core central processing unit; the programmable logic module includes: a field programmable logic gate array.
7. The system according to claim 6, characterized in that The programmable logic module is connected to the indicator light module, the switch module and the key module respectively.
8. The system according to claim 1, characterized in that The main power switch is a single-pole double-throw switch.
9. The system according to claim 1, characterized in that The system further comprises: a system reset module and a mode configuration module respectively connected to the processor; The system reset module is used to provide system reset for the processor; The mode configuration module is used to configure the startup mode of the system.