GB2399661A - Universal Micro Memory Card - Google Patents
Universal Micro Memory Card Download PDFInfo
- Publication number
- GB2399661A GB2399661A GB0321398A GB0321398A GB2399661A GB 2399661 A GB2399661 A GB 2399661A GB 0321398 A GB0321398 A GB 0321398A GB 0321398 A GB0321398 A GB 0321398A GB 2399661 A GB2399661 A GB 2399661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- memory card
- interface
- usb
- pins
- micro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
- G06K19/07732—Physical layout of the record carrier the record carrier having a housing or construction similar to well-known portable memory devices, such as SD cards, USB or memory sticks
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
- G06K19/07733—Physical layout of the record carrier the record carrier containing at least one further contact interface not conform ISO-7816
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07743—External electrical contacts
Abstract
A universal micro memory card having a unique common transmission interface designed according to USB specifications and equipped with both USB pins and data transmission pins. Said universal micro card detects the type of system interface connected to it from the initialization signals sent from the system end via the USB pins (D+ and D-), and then switches to the corresponding working mode. Said universal micro memory card thus enables signal transmission to/from different memory card systems via said common transmission interface.
Description
Universal Micro Memory Card This invention relates to a rewritable micro
memory card, in particular a rewritable micro memory card adaptive to different memory card systems.
Due to the vast market value of micro memory cards, manufacturers promote their own versions, expecting their memory card products to be major ones. However, competition has led to memory cards from manufacturers differing from each other both in mechanical dimensions and in electric interfaces, instruction sets, data transmission protocols, and control modes, increasing the diversification of memory card specifications and supporting system interfaces. This situation causes not only embarrassment to consumers but also difficulty in the development of information appliances, digital electronic devices, and peripheral equipment for computers.
To solve the above problem, experts in the industry have designed a memory card adapter that supports different memory cards. Said adapter consolidates the specifications, dimensions and circuits of different memory cards into a single all-in-one read/write slot and is connected to a computer system via a transmission interface (e.g., USB, IEEE1394, PCMCIA, CF) to enable data transmission. However, said adapter does not have storage capacity and is only designed for data transmission to/from the memory card.
Furthermore, said adapter cannot be used directly in digital cameras, PDAs or lAs.
Therefore, there is an urgent need to develop a memory card that consolidates the interface specifications, transmission protocols, and circuits of existing memory cards and can communicate with computers or various devices without the assistance of expensive adapting devices. Such a memory card would eliminate the embarrassment caused to consumers resulting from incompatible memory card specifications and expensive adapting devices.
The present invention provides a universal micro memory card, which has been designed by the inventor through study and tests with the aim of solving the above problem and attaining other efficacies, in order to facilitate consumers in data transfer.
The main purpose of the invention is to provide a universal micro memory card, which not only operates normally with its own system interface but also supports existing memory card system interfaces, such as SD and MS series 1 0 interfaces.
Another purpose of the invention is to provide a universal micro memory card that supports a USB interface, which has become the defacto standard for peripheral equipment.
To attain the above purposes and efficacies, the universal micro memory card of the invention has a common transmission interface, through which data transmission may take place between different memory card systems and said micro memory card. Said common transmission interface is designed on the basis of a USB interface, and has USB interface pins and at least a pin for data transmission.
Said universal micro memory card has not only a redesigned transmission interface but also an improved internal circuit. It is equipped with an internal rewritable memory chip. The universal micro memory card features: USB pins (D+ and D+) to transfer initialization signals from the interface of the memory card system and automatically detect potential variation in those initialization signals with the interface detection/switching circuit in the common transmission interface. It determines the type of memory card system interface and the corresponding signal transmission circuit to enable the micro controller to switch to the corresponding working mode that supports the memory card system interface. Said universal micro memory card then processes signals from a specific transmission route according to its working mode.
With the above design, the micro memory card not only supports existing memory card system interfaces with its internal electric interface, instruction set, and data transmission protocols, but is compatible with existing memory card system interfaces in the mechanical dimensions of its interface. Thus the said micro memory card is a universal micro memory card.
To understand the above purpose and other purposes, features, and advantages of said micro memory card, the micro memory card is detailed in the following examples of preferred embodiments, with reference to the attached drawings.
Figure 1 is a list of labels, signal names and properties of USB/MS series/SD interface pins.
Figure 2 is a comparative list of pins of the micro memory card in the present invention and those of other system interfaces.
Figure 3 shows the configuration of USB interfaces pins.
Figure 4 shows the configuration of the micro memory card in the present invention.
Figure 5, Figure 6, and Figure 7 show time sequence diagrams of initialization signals transferred via USB/MS series/SD system interfaces, respectively.
Figure 8 is a block chart of the internal circuit of the micro memory card in the present invention.
The universal micro memory card in the present invention combines popular Memory Stick series (hereafter is referred to as "MS series") and Secure Digital cards (hereafter is referred to as "SD") with a USB interface (widely used for peripheral equipments) in a common transmission interface to support different memory card systems.
Figure 1 shows a list of USB/MS series/SD interface pins, signal names and properties. Though the number of pins of each interface is different from each other (USB: 4 pins, MS series: 10 pins, SD: 9 pins), we can see from the list that there are several identical pins between the MS series and SD interface, such as the power supply pin (VCCNDD), grounding pin (VSS), data transmission pins (DO-D3), and clock pin (CLK). Moreover, a USB interface also has a power supply pin (VCC), grounding pin (GND), and basic data transmission pins (D+ and D-). Therefore, the micro memory card in the present invention is designed on the basis of a USB interface specification, with a combination of data transmission pins from MS series/SD interfaces to form a common transmission interface, through which different memory card system interfaces (e.g., MS series/SD interfaces) can transfer data to/from said micro memory card.
Figure 2 shows a comparative list of specifications/pins of said micro memory card and specifications/pins of three other types of system interfaces.
From the above Figure 1 and Figure 2 we can see that through appropriate alignment and consolidation (4 pins from a standard USB interface (as shown in Figure 3, numbered 1, 2, 3 and 4) and another 4 pins serving as data transmission pins in MS series/SD interfaces (DO, D1, D2, and D3, as shown in Figure 4, numbered 5, 6, 7 and 8 respectively)), a common transmission interface that supports the above three interfaces may be implemented in said micro memory card.
In said common transmission interface, the positive power supply pin (VCC) of the USB interface also serves as the positive power supply pins of MS series and SD interfaces (VCCNDD), and the negative power supply pin (GND) of the USB interface also serves as the negative power supply pins of MS series and SD interfaces (VSS). It should be noted that the 6th Pin (INS) of the MS series system interface is used by the system end to determine whether a memory card has been inserted into the system interface. Therefore, at the micro memory card end, that pin may be directly connected to the negative pole of the power supply. That is to say, the 6th pin may be deemed VSS and share the same pin with VSS in the present invention.
Besides the above shared pins, the D+ and D- pins of the USB interface may be modified to multiplex signal pins MF1 and MF2, which may be used to transfer corresponding signals according to the transmission protocol for the memory card system interface. In brief, a specific signal mode (transmission control signals or data signals) may be used according to the system interface being connected. For example, for the above three types of system interfaces; if said micro memory card is inserted into a USB system interface, MF1 will be switched to transfer D+ signals, and MF2 will be switched to transmission D signals; if said micro memory card is inserted into an MS series system interface, MF1 will be switched to transfer CLK signals, and MF2 will be switched to transfer BS signals; if said micro memory card is inserted into an SD system interface, MF1 will be switched to transfer CLK signals, and MF2 will be switched to transfer CMD signals. In that way, only two pins are required to detect the type of system interface being used, thus different system interfaces may transfer corresponding signals via the two pins.
Hereunder we describe how signals transferred via MF1 and MF2 can be used as signals to detect the type of system interface being used, wherein said signals for detection of the system interface are initialization signals transferred from the system interface to said micro memory card when said micro memory card is inserted into the system interface.
Figure 5, Figure 6, and Figure 7 show a time sequence drawing of initialization signals transferred via USB/MS series/SD system interfaces, respectively.
As shown in Figure 5, when said micro memory card is inserted into a USB system interface, the potential variation in D- signals of the USB interface will occur at MF2 (i.e., it maintains a low potential); while the potential variation in D+ signals of USB interface will occur at MF1 (i.e., it drops to a low potential 100ms after rising to a high potential, remains there for 10ms, and then returns to a high potential).
As shown in Figure 6, when said micro memory card is inserted into an MS series system interface, the potential variation in CLK signals of the MS series interface will occur at MF2 (i.e., oscillating clock pulse signals are received from the system end); while the potential variation in RS signals of the MS series interface will occur at MF1 (i.e., it maintains a low potential).
As shown in Figure 7, when said micro memory card is inserted into an SD system interface, the potential variation in CLK signals of SD will occur at MF2 (i.e., oscillating clock pulse signals are received from the system end); while the potential variation in CMD signals of the SD interface will occur at MF1 (i.e., it maintains a high potential).
In conclusion, when said universal micro memory card is inserted into a system interface, its internal circuit can receive initialization signals sent from the system end via the redefined MF1 pin (originally a D+ pin of a USB interface) and MF2 pin (originally a D- pin of a USB interface) and detect the potential variation in those initialization signals to determine the type of system interface being used.
Figure 8 shows a block chart of the internal circuit of said micro memory card in the present invention. Said micro memory card 8 comprises at least a common transmission interface 81, an interface detection/switching circuit 82, a micro controller 83, and a rewritable internal memory chip 86.
The common transmission interface 81 is designed on the basis of USB interface specifications, with USB interface pins (e.g., VCC, GND, MF1 (D+ ), and MF2 (D-)), and additional data transmission pins (i.e., DO, D1, D2, and D3).
From the above description we can see that in this embodiment the card receives initialization signals sent from the memory card system interface via MF1 (D+) and MF2 (D-) pins.
The interface detection/switching circuit 82 comprises a detection circuit 821, a switching circuit 822, and MF1 and MF2 pins of common transmission interface 81. The detection circuit 821 is used to automatically detect the potential variation in initialization signals to determine the type of memory card system interface where said micro memory card 8 is inserted; while the switching circuit 822 switches the signal transmission route according to the detection result.
The micro controller 83 switches to the working mode (such as SD mode, MS series mode, or USB mode) corresponding to the memory card system interface being used, according to the detection result of the interface detection/switching circuit 82, and processes the signals through the specified transmission route according to the working mode.
In addition, said universal micro memory card 8 may also be equipped with an internal data bus 842 and a control signal bus 841 to connect the interface detection/switching circuit 82 and transfer data to/from the micro controller 83 via a cache 87. Signals transferred through said data bus 842 are different from those transferred through said control signal bus 841. For example, data bus 842 may transfer D+ and D- signals of a USB system interface as well as DO - D3 signals of MS series/SD system interfaces, while the control signal bus 841 may transfer CLK, BS, and CMD signals of MS series/SD system interfaces.
For example, for the above three types of system interfaces (USB, MS series and SD), during the initialization phase performed at the system end, if the initialization signal transferred via MF2 is a low potential signal, the detection circuit 821 will instruct the switching circuit 822 to switch the transmission route to data bus 842 and transfer the detection result to micro controller 83, which switches to a USB working mode.
When power up of the system end has started, if the initialization signal transferred via MF1 is a low potential signal, the detection circuit 821 will instruct the switching circuit 822 to switch the transmission route to control signal bus 841 and transfer the detection result to micro controller 83, which switches to SD When power up of the system end has started, if the initialization signal transferred via MF1 is a high potential signal, the detection circuit 821 will instruct the switching circuit 822 to switch the transmission route to data bus 842 and transfer the detection result to micro controller 83, which switches to MS series working mode.
In that way, the micro controller 83 may process signals transferred from the system end with a specific instruction set, data transmission protocol, and control mode according to the above working modes.
Embodiments implemented according to the above principle may automatically detect the type of system interface being used with said interface detection/switching circuit 82 and transfer the detection result to micro controller 83. However, the embedded program in the micro controller 83 may be modified to enable the above interface detection/switching circuit 82 to detect whether any initialization signal is available and switch the signal transmission route, but instruct the micro controller 83 to receive initialization signals and distinguish potential variation in those initialization signals, in order to determine the type of system interface where said micro memory card 8 is inserted and switch the micro memory card 8 to the working mode that supports the system interface, as well as process signals from a corresponding transmission route according to the working mode. Such a modified design is more flexible in circuit implementation.
In addition to the above circuit, said micro memory card 8 also comprises an internal voltage transformation/protection circuit 85, which is connected to pin VCC and pin GND originally used by USB to transform voltage from different system interfaces to a voltage suitable for the internal circuit of said micro memory card 8, providing a voltage regulation and protection function.
It is appreciated that the above embodiments are only used to disclose the present invention and should not constitute any limitation to the invention.
Any expert skilled in the art may easily implement modifications or embellishments to the embodiments without deviating from the spirit and scope of the present invention. Therefore, any embodiment with equivalent modifications or embellishments shall fall within the scope of the invention, which is only confined to the claims attached.
Claims (16)
- What is claimed is: 1. A universal micro memory card featuring: saiduniversal micro memory card has a common transmission interface designed on the basis of USB specifications, with a plurality of USB interface pins and at least a data transmission pin, to support different memory card system transfer signals to/from said micro memory card via said common transmission interface.
- 2. The universal micro memory card as in claim 1, wherein said memory card system interfaces include USB, SD, or MS series, or other types of memory card system interfaces.
- 3. The universal micro memory card as in claim 1, wherein said USB interface pins include power supply pins and data transmission pins.
- 4. The universal micro memory card as in claim 3, wherein said data transmission pins transfer corresponding characteristic signals according to the transmission protocol of a specific memory card system interface.
- 5. A universal micro memory card featuring: said micro memory card has a common transmission interface with one end connected electrically to the internal circuit of said micro memory card and the other end coupled with a conversion interface of preset specifications; said micro memory card may be used with any type of memory card system interface, and said common transmission interface is designed on the basis of USB specifications with a plurality of USB interface pins and at least a data transmission pin.
- 6. The universal micro memory card as in claim 5, wherein said USB interface pins include power supply pins and data transmission pins.
- 7. The universal micro memory card as in claim 6, wherein said data transmission pins transfer corresponding characteristic signals according to the transmission protocol of a specific memory card system interface.
- 8. The universal micro memory card as in claim 5, wherein said memory card system interfaces include USB, SD, or MS series, or other types of memory card system interfaces. i
- 9. A universal micro memory card with an internal rewritable memory card, wherein said universal micro memory card features: a common transmission interface designed on the basis of USB specifications, with a plurality of USB interface pins and at least a data I transmission pin; said common transmission interface utilizes D+ and Dpins of a USB interface to transfer a plurality of initialization signals sent from said memory card system interface, and; an interface detection/switching circuit comprising a detection circuit and a switching circuit connected electrically to said common transmission interface; said detection circuit is designed to automatically detect potential variation in said initialization signals to determine the type of memory card system interface where said memory card is inserted; said switching circuit switches the signal transmission route according to the detection result, and; a micro controller that switches to the working mode corresponding to the, specific memory card system interface according to the detection result from! said interface detection/switching circuit and processes signals from the corresponding transmission route according to said working mode.
- 10.The universal micro memory card in claim 9 further comprises a data bus and a control signal bus connected to said interface detection/switching circuit and said micro controller; said data bus and control signal bus serve as transmission routes to transfer different signals.
- 11.The universal micro memory card in claim 9 further comprises a voltage transformation/protection circuit connected to the power supply pins of a USB! interface to transform voltage from different memory card system interfaces into the voltage suitable for the internal circuit of said micro memory card.
- 12.The universal micro memory card as in claim 9, wherein said memory card system interfaces include USB, SD, or MS series, or other types of memory card system interfaces.
- 13.A universal micro memory card with an internal rewritable memory chip, said universal micro memory card is featuring: a common transmission interface designed on the basis of USB specifications, with a plurality of USB interface pins and at least a data transmission pin; said common transmission interface utilizes D+ and D- pins of a USB interface to transfer a plurality of initialization signals sent from said memory card system interface, and; an interface detection/switching circuit comprising a detection circuit and a switching circuit connected electrically to said common transmission interface; said detection circuit is designed to detect whether said initialization signals are available; said switching circuit is designed to switch the signal transmission route, and; a micro controller connected to said interface detection/switching circuit; said micro controller receives said initialization signals and distinguishes the potential variation in said initialization signal, to determine the type of memory card system interface where said micro memory card is inserted and switch to the working mode corresponding to said memory card system interface, and then processes signals from a specific transmission route according to the working mode.
- 14.The universal micro memory card in claim 13 further comprises a data bus and a control signal bus connected to said interface detection/switching circuit and said micro controller; said data bus and control signal bus serve as transmission routes to transfer different signals.
- 15.The universal micro memory card in claim 13 further comprises a power transformation/protection circuit connected to the power supply pins of a USB interface to transform voltage from different memory card system interfaces into the voltage suitable for the internal circuit of said micro memory card.
- 16.The universal micro memory card as in claim 13, wherein said memory card system interfaces include USB, SD, or MS series, or other types of memory card system interfaces.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW92106373 | 2003-03-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0321398D0 GB0321398D0 (en) | 2003-10-15 |
| GB2399661A true GB2399661A (en) | 2004-09-22 |
Family
ID=29247725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0321398A Withdrawn GB2399661A (en) | 2003-03-21 | 2003-09-12 | Universal Micro Memory Card |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2399661A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2430508A (en) * | 2005-09-21 | 2007-03-28 | Power Digital Card Co Ltd | Memory card with an integral dual interface |
| CN100371947C (en) * | 2006-06-06 | 2008-02-27 | 磐石国际股份有限公司 | Memory card for integrating communication sequence interface |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010000405A1 (en) * | 1998-10-21 | 2001-04-26 | Gray Robert J. | Apparatus and method of providing a dual mode card and reader |
| US6439464B1 (en) * | 2000-10-11 | 2002-08-27 | Stmicroelectronics, Inc. | Dual mode smart card and associated methods |
-
2003
- 2003-09-12 GB GB0321398A patent/GB2399661A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010000405A1 (en) * | 1998-10-21 | 2001-04-26 | Gray Robert J. | Apparatus and method of providing a dual mode card and reader |
| US6439464B1 (en) * | 2000-10-11 | 2002-08-27 | Stmicroelectronics, Inc. | Dual mode smart card and associated methods |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2430508A (en) * | 2005-09-21 | 2007-03-28 | Power Digital Card Co Ltd | Memory card with an integral dual interface |
| CN100371947C (en) * | 2006-06-06 | 2008-02-27 | 磐石国际股份有限公司 | Memory card for integrating communication sequence interface |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0321398D0 (en) | 2003-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |