CN201867842U - Reading-writing circuit for smart card reader-writer - Google Patents
Reading-writing circuit for smart card reader-writer Download PDFInfo
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- CN201867842U CN201867842U CN2010205998115U CN201020599811U CN201867842U CN 201867842 U CN201867842 U CN 201867842U CN 2010205998115 U CN2010205998115 U CN 2010205998115U CN 201020599811 U CN201020599811 U CN 201020599811U CN 201867842 U CN201867842 U CN 201867842U
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- smart card
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- mcu
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- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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Abstract
The utility model provides a reading-writing circuit used for a smart card reader-writer, which comprises two parts, namely a smart card strobing circuit and a level converting circuit; an MCU (microprogrammed control unit) in the smart card strobing circuit is communicated with a CPLD (complex programmable logic device) through a bus, and the CPLD further completes corresponding logic action for strobing any smart card to be connected with the MCU, so as to cause the strobed smart card to be communicated with the MCU; the CPLD also provides mutually independent working clocks for each smart card, and the MCU can be used for adjusting the working clocks according to specific instructions, so that the circuit can provide the working clocks of different frequencies for each smart card; and the level converting circuit is used for reading and writing the smart cards supplied with power under 5V voltage. The reading-writing circuit can ensure that the reading and writing of a plurality of smart cards are mutually independent, and can be used for reading and writing the smart cards supplied with power under 3V voltage and 5V voltage.
Description
Technical field
The utility model is read and write the field about smart card, blocks the read/write circuit of operation especially in regard to a kind of support that is used for intelligent card read/write device more.
Background technology
Smart card (Smart Card) also be IC-card, and it is a kind of card that has micro integrated circuit chips such as microprocessor and storer, has standard specification.Smart card must be followed a cover standard, and ISO 7816 is wherein most important one.ISO 7816 standard codes the profile of smart card, thickness, contact position, electric signal, agreement etc.Smart card techniques combines microelectric technique and computer technology, has high reliability, security and dirigibility, and it is widely used in fields such as telecommunications, finance, intelligent transportation and government utility.The smart card read/write circuit is the bridge that connects smart card and main control equipment, is one of most important components in the intelligent card in processing equipment.
Smart card read/write circuit commonly used at present can not read while write the smart card of multi-way intelligence card or different power voltage, and the shared same clock of multi-way intelligence card, cause read-write to influence each other to the multi-way intelligence card, and can not take into account read-write simultaneously, therefore can not realize many card operations the smart card of 3V and 5V power supply.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of read/write circuits of supporting many card operations are provided, can guarantee independent mutually to the read-write of multi-way intelligence card, be independent of each other, and take into account read-write simultaneously to the smart card of 3V and 5V power supply.
For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions:
Read/write circuit of the present utility model is made up of smart card gating circuit and level shifting circuit two parts.Micro-control unit in the smart card gating circuit (Micro Control Unit, MCU) with CPLD (Complex Programmable Logic Device, CPLD) by bus mode communication, make CPLD finish corresponding logical action and come being connected of any one road smart card of gating and MCU, realize communicating by letter of selected smart card and MCU with this.CPLD also provides separate work clock for each road smart card, and MCU can regulate this work clock by specific instruction, and circuit can provide the work clock of different frequency for the smart card on each road like this, satisfies different design needs with this.
Level shifting circuit is used for realizing reading and writing the smart card that some need the 5V power voltage supply, and this design has taken into account the smart card that needs 3V and 5V power supply, makes the applicability of read/write circuit stronger.
Compared with prior art, the beneficial effects of the utility model are:
Described read/write circuit can guarantee the mutual independence of the read-write of multi-way intelligence card, be independent of each other, and takes into account the read-write to the smart card of 3V and 5V power supply simultaneously.Circuit design is simply effective, has improved the dirigibility of circuit, also makes the only intelligent card interface of MCU chip obtain utilizing more fully.
Description of drawings
Fig. 1 is the read/write circuit structural representation that is used for intelligent card read/write device.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described.
Read/write circuit described in the utility model cooperates the read-write capability of finishing smart card as the part in the read-write equipment for smart card with read-write equipment for smart card main control chip, power circuit and draw-in groove deck etc.Figure 1 shows that read/write circuit, form by smart card gating circuit and level shifting circuit two parts.MCU in the smart card gating circuit communicates by letter by bus mode with CPLD, makes CPLD finish corresponding logical action and comes being connected of any one road smart card of gating and MCU, realizes communicating by letter of selected smart card and MCU with this.CPLD also provides separate work clock for each road smart card, and MCU can regulate this work clock by specific instruction, and circuit can provide the work clock of different frequency for the smart card on each road like this, satisfies different design needs with this.Level shifting circuit is used for realizing reading and writing the smart card that some need the 5V power voltage supply, and this design has taken into account the smart card that needs 3V and 5V power supply, makes the applicability of read/write circuit stronger.
Above embodiment only is used to illustrate the utility model, but not is used to limit the utility model.
Claims (1)
1. read/write circuit that is used for intelligent card read/write device, form by smart card gating circuit and level shifting circuit two parts, it is characterized in that: the MCU in the described smart card gating circuit communicates by letter by bus mode with CPLD, makes CPLD finish corresponding logical action and comes being connected of any one road smart card of gating and MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205998115U CN201867842U (en) | 2010-11-08 | 2010-11-08 | Reading-writing circuit for smart card reader-writer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205998115U CN201867842U (en) | 2010-11-08 | 2010-11-08 | Reading-writing circuit for smart card reader-writer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201867842U true CN201867842U (en) | 2011-06-15 |
Family
ID=44138993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205998115U Expired - Lifetime CN201867842U (en) | 2010-11-08 | 2010-11-08 | Reading-writing circuit for smart card reader-writer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201867842U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200148A (en) * | 2014-08-25 | 2014-12-10 | 浪潮集团有限公司 | Smart card redundancy switching method based on independently domestic redundancy server |
-
2010
- 2010-11-08 CN CN2010205998115U patent/CN201867842U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200148A (en) * | 2014-08-25 | 2014-12-10 | 浪潮集团有限公司 | Smart card redundancy switching method based on independently domestic redundancy server |
| CN104200148B (en) * | 2014-08-25 | 2017-06-09 | 浪潮集团有限公司 | A kind of smart card redundancy switching method based on autonomous domestic redundant server |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100085 Beijing East Road, No. 1, building No. 5, building No. 601, No. Patentee after: Beijing Wanji Technology Co., Ltd. Address before: 100085 Beijing East Road, No. 1, building No. 5, building No. 601, No. Patentee before: Beijing Wanji Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110615 |
|
| CX01 | Expiry of patent term |