CN202584143U - A read-only card reader with multiple interfaces - Google Patents

Abstract

The utility model discloses a device which is easy to manipulate, compatible with various memory cards, and capable of achieving a read-only or read-write function. A memory card with data needed to be acquired and analyzed should be inserted into a corresponding interface of the device by a user while the other end of the device is connected with a computer through a USB wire. With a plug and play characteristic, the device is supplied with power by a USB port of the computer when an external power source and a special driving program are not needed. Supported types of memory cards to be acquired comprise SD/xD, SD/MMC/MS/MS PRO, CF/MD, and USB storage medium or the like. The device includes two operating modes of (1) a read-write mode and (2) a read-only mode. In the read-write mode, the device can be used as a USB card reader. The read to the memory card is achieved by converting various memory cards into USB to be connected with the computer. In the read-only mode, a write-in channel is inhibited in a hardware layer in order to effectively protect the memory card against being modified in acquiring and analyzing procedure. In the meantime, with low power consumption technology and a low-power-consumption single chip machine employed by a product processor, the device has light weight and is portable.

Description

The read-only card reader of a kind of many interfaces

Technical field

The utility model belongs to electronic media evidence obtaining field, the read-only card reader of particularly a kind of many interfaces.

Background technology

Fast development along with Chinese national economy; The fast development of the significantly raising, particularly electronic technology of living standards of the people, computing machine, smart mobile phone, digital camera, MP3 etc. have become one of widely known common tool; Meanwhile; Various storage cards are also popularized in a large number, and are of a great variety, like SM/xD, SD/MMC/MS/MSPRO, CF/MD, USB storage medium etc.Yet the case of incident computing machine and network type progressively increases, and case-involving individual movable storage device is more and more, wherein just comprises storage card.Be to guarantee the judicial validity and the data integrity of storage card internal information, this just need effectively protect storage card to be obtained and the analytic process data are not modified at quilt.Therefore provide a kind of compatibility various types of storage cards, and handled easily, portable read-only device is very important.

The utility model content

The utility model discloses a kind of various storage cards simple to operate, compatible, and can realize the read-only card reader of many interfaces of read-only or read-write capability, improves compatibility of apparatus, comprising:

1, the read-only card reader of a kind of many interfaces is characterized in that, comprising:

Energy supply control module is used for computing machine USB interface power supply is changed into the used power supply of card reader and inserts the required power supply of storage card;

USB OTG module links to each other with the MCU controller with fifo module through the DMA passage, and links to each other with computing machine through first USB interface, is used for the data transmission between control store card and the computing machine;

First USB interface is used to connect computing machine;

Fifo module links to each other with first USB interface through USB OTG module, for card reader provides the first in first out caching function;

The DMA passage, the data communication between the storage card of realization computing machine and SM/xD interface, SD/MMC/MS/MS PRO interface, CF/MD interface, USB interface;

Second USB interface links to each other with the storage card identification module, is used to connect USB interface storer to be read;

The SM/xD interface links to each other with the storage card identification module, is used for the access of SM/xD interface card;

SD/MMC/MS/MS PRO interface links to each other with storage card identification module 10, is used for the access of SD/MMC/MS/MS PRO card;

The CF/MD interface links to each other with the storage card identification module, is used for the access of CF/MD card;

The storage card identification module links to each other with the MCU controller, and whether have storage card insert, obtain storage card information if being used for inspection, and identification memory card type, and notice MCU controller switch to the corresponding stored card to the DMA passage simultaneously;

Indicating lamp module is made up of LED, is used to point out card reader various duties;

Mode selection module is made up of change-over switch, and user interface is provided, and supplies the user to carry out model selection;

The MCU controller; Link to each other with the storage card identification module with USB OTG module through the DMA passage; Realization is controlled energy supply control module, storage card identification module, indicating lamp module, mode selection module, USB OTG module, fifo module, PLL module, RAM module, FLASH module; And the DMA data stream monitored and control, realize to storage card read-only or read-write capability;

The PLL module is used for reading card device clock signal and carries out frequency modulation and demodulation, and different clock frequencies is provided, and reduces the external crystal-controlled oscillation frequency simultaneously, improves card reader stability;

The RAM module is used for when card reader starts the program copy of the MCU controller of FLASH module stores in RAM;

The FLASH module, the program of store M CU controller.

This card reader increases the automatic recognition function of interface through integrating multiple interfaces, has improved the versatility of card reader.

Description of drawings

Fig. 1 is the utility model structural drawing;

Fig. 2 is the utility model operational flowchart.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is done further explain.As shown in Figure 1, the read-only card reader of a kind of many interfaces is disclosed, comprising:

Energy supply control module 1 changes into computing machine USB interface power supply the used power supply of card reader and inserts the required power supply of storage card.

USB OTG module 2 links to each other with MCU controller 13 with fifo module 4 through the DMA passage, and links to each other the data transmission between control store card and the computing machine with computing machine through first USB interface 3.USBOTG (USB On-The-Go Controller) can be USB Host or USB Device, is USB Device in the present embodiment, communicates with computing machine, supports USB1.0, USB2.0 full speed and high speed protocol, and maximal rate reaches 480Mb/s.

First USB interface 3 is used to connect computing machine, and this interface can directly insert the computing machine USB interface for the public head of standard USB A type.

Fifo module 4 is that (First Input First Output, data buffer FIFO) link to each other with first USB interface 3 through USB OTG module 2, for card reader provides the first in first out caching function in a kind of first in first out.This module is made up of two 1024 byte FIFO, and can compile is No. 1 fifo module and No. 2 fifo modules, available ping-pong operation, and when promptly MCU controller 13 read No. 1 data fifo, the data that USB OTG module 2 receives write FIFO No. 2; When MCU controller 13 is handled data fifo No. 1, when removing to read No. 2 data fifos, the data that USB OTG receives write FIFO No. 1, can accelerate communication speed like this.Simultaneously, between MCU controller 13 and storage card identification module 10, also add an identical fifo module, can accelerate the communication speed that card reader and storage card are seen.

DMA passage 5 is realized the data communication between computing machine and SM/xD interface, SD/MMC/MS/MS PRO interface, CF/MD interface, the USB interface storage card.DMA (Direct Memory Acces s, direct memory access) is an important technology of electronic technology, carries out direct data communication between the hardware unit of permission friction speed, and need not depend on a large amount of interrupt load of MCU.It can directly be transferred to another address space with data from an address space, thereby significantly reduces the workload of MCU.

Second USB interface 6, the female head of standard USB A type is used to receive the USB interface storeies such as USB flash disk that read.

SM/xD interface 7, standard SM/xD interface is used for the access of SM/xD card.

SD/MMC/MS/MS PRO interface 8, standard SD/MMC/MS/MS PRO interface is used for the access of SD/MMC/MS/MSPRO card.

CF/MD interface 9, standard C F/MD interface is used for the access of CF/MD card.

Storage card identification module 10 links to each other with MCU controller 13, and whether have storage card insert, obtain storage card information if being used for timely inspection, and identification memory card type, and notice MCU controller 13 switch to the corresponding stored card to the DMA passage simultaneously.

Indicating lamp module 11 is made up of LED, is used for the various duties of prompt facility.

Mode selection module 12 is made up of change-over switch, and user interface is provided.

MCU controller 13; MCU (micro control unit; Micro-control unit), through the DMA passage with link to each other with storage card identification module 10 with USB OTG module 2 through the DMA passage, realize energy supply control module 1, storage card identification module 10, indicating lamp module 11, mode selection module 12, USB OTG module 2, fifo module 4, PLL module 14, RAM module 15, FLASH module 16 are controlled; The DMA data stream is monitored and controlled, realize to storage card read-only or read-write capability.

MCU controller 13 can adopt the CSM8X51 single-chip microcomputer, compatible C51 instruction, and frequency of operation can reach 60MHz, and groundwork is that each module is controlled, and the DMA data stream is monitored and controlled, and realizes read-only or read-write capability.

PLL module 14 adopts PLL (phase locked loop) PHASE-LOCKED LOOP PLL TECHNIQUE, can carry out frequency modulation and demodulation to clock signal, and different clock frequencies is provided, and reduces the external crystal-controlled oscillation frequency simultaneously, improves system stability.

RAM module 15 can prolong the life-span of FLASH during device start like this program copy of the MCU controller 13 of FLASH module 16 storages in RAM, simultaneously also can other data of buffer memory.

FLASH module 16, the program of store M CU controller 13.

Fig. 2 has showed the operating process of this card reader: the storage card that the user obtains needs and analyze is inserted into the corresponding interface of card reader, selects read-only/read-write mode, is connected to computer through the USB line then, and equipment gets into initialization.Power light, read-only/the read-write pilot lamp (red read-only, green read-write), storage card identification pilot lamp connects the computer pilot lamp, can successively light.After computer pilot lamp to be connected lights, can find that computer recognizes storage card, equipment gets into normal operating conditions, and the user can operate storage card.

Main explanation:

1. power light, it is undesired that read-only/the read-write pilot lamp (red read-only, green read-write) shows, goes wrong on the hardware, please do not continue to use, in order to avoid burn out storage card;

2. the demonstration of storage card identification pilot lamp is undesired, is that the storage card identification division goes wrong, and can check down whether contact well;

3. it is undesired to connect the demonstration of computer pilot lamp, is to connect computer partly to go wrong, and whether PLSCONFM computer USB interface and USB connecting line be normal;

4. only under the reading mode; When protected storage card writes data, seem that data write success, in fact equipment has stoped on hardware layer and has write passage; Data really do not write storage card, and just the equipment error message that do not have to write the solicit operation failure feeds back to operating system.

In sum, this programme provides the card reader of the various types of storage cards of a kind of compatibility, and handled easily, is easy to carry.And effectively protect storage card being obtained and the analytic process data are not modified, guarantee the judicial validity and the data integrity of storage card internal information.

Claims (1)

1. the read-only card reader of interface more than a kind is characterized in that, comprising:

Energy supply control module is used for computing machine USB interface power supply is changed into the used power supply of card reader and inserts the required power supply of storage card;

USB OTG module links to each other with the MCU controller with fifo module through the DMA passage, and links to each other with computing machine through first USB interface, is used for the data transmission between control store card and the computing machine;

First USB interface is used to connect computing machine;

Fifo module links to each other with first USB interface through USB OTG module, for card reader provides the first in first out caching function;

The DMA passage, the data communication between the storage card of realization computing machine and SM/xD interface, SD/MMC/MS/MS PRO interface, CF/MD interface, USB interface;

Second USB interface links to each other with the storage card identification module, is used to connect USB interface storer to be read;

The SM/xD interface links to each other with the storage card identification module, is used for the access of SM/xD interface card;

SD/MMC/MS/MS PRO interface links to each other with storage card identification module (10), is used for the access of SD/MMC/MS/MSPRO card;

The CF/MD interface links to each other with the storage card identification module, is used for the access of CF/MD card;

The storage card identification module links to each other with the MCU controller, and whether have storage card insert, obtain storage card information if being used for inspection, and identification memory card type, and notice MCU controller switch to the corresponding stored card to the DMA passage simultaneously;

Indicating lamp module is made up of LED, is used to point out card reader various duties;

Mode selection module is made up of change-over switch, and user interface is provided, and supplies the user to carry out model selection;

The MCU controller; Link to each other with the storage card identification module with USB OTG module through the DMA passage; Realization is controlled energy supply control module, storage card identification module, indicating lamp module, mode selection module, USB OTG module, fifo module, PLL module, RAM module, FLASH module; And the DMA data stream monitored and control, realize to storage card read-only or read-write capability;

The PLL module is used for reading card device clock signal and carries out frequency modulation and demodulation, and different clock frequencies is provided, and reduces the external crystal-controlled oscillation frequency simultaneously, improves card reader stability;

The RAM module is used for when card reader starts the program copy of the MCU controller of FLASH module stores in RAM;

The FLASH module, the program of store M CU controller.

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