M1 card includes logical encryption card M1, ML and dual interface CPU card. Contactless cards have the following advantages.
(1) high reliability
No mechanical contact between the contactless IC card and the read-write equipment, avoiding all kinds of failures due to contact reading and writing; contactless IC card M1 surface without exposed chips, no chip off, electrostatic breakdown, bending damage and other problems animal?
(2) long service life
M1 card can be written repeatedly for 100,000 times, the number of read operations is unlimited;
(3) easy and fast operation
M1 card use no direction, no need to plug and play, and greatly improve the speed of each use;
M1 card operation energy supply using passive mode, non-contact operation;
M1 card operation energy supply using passive mode, non-contact operation;
(3) easy and fast operation;
M1 card operation energy supply using passive mode, non-contact operation, non-contact operation.
(4) anti-conflict
Contactless card M1 has a fast anti-conflict mechanism to prevent data interference between cards. Therefore, the reader can handle multiple contactless IC cards "at the same time", improving the parallelism of the application.
(5) Can be applied to a variety of applications
The contactless card M1 sector, block of the memory structure features make it suitable for a card for multiple use, can be applied to different system management, according to different applications to set different passwords and access conditions.
(6) encryption performance
Contactless card M1 has an unchangeable global chip unique serial number; contactless card and reader using two-way authentication mechanism between the contactless card and reader, contactless card M1 in the data processing before the reader to carry out three times the mutual authentication, but also in the process of communication of all the data are encrypted;
M1 card in each sector are independent of the operating password and access conditions. operating passwords and access conditions.
The contactless IC card, also known as radio frequency card, has successfully solved the problem of passive (no power supply in the card) and contact-free, which is a major breakthrough in the field of electronic devices. It is mainly used in automatic fare collection systems for public transportation, social security, medical care, ferries and subways, and is also applied in access control management, identification and electronic wallets.
The main indicators of M 1 card:
Capacity of 8K-bit EEPROM
Divided into 16 sectors, each sector is 4 blocks, each block of 16 bytes, with block as the unit of access
Each sector has an independent set of passwords and access control
Each card has a unique serial number of 32-bit
With anti-conflict mechanism, support for multi-card operation
The card has a unique serial number of 32-bit. Conflict mechanism, support for multi-card operation
No power supply, with its own antenna, containing encryption control logic and communication logic circuitry
The data retention period of 10 years, can be rewritten 100,000 times, read unlimited times
Operating temperature: -20 ℃ ~ 50 ℃ (temperature of 90%)
Operating frequency: 13.56MHZ
Communication rate: 106KBPS
The card is a unique serial number of 32 bits. 106KBPS
Read-write distance: within 10mm (related to the reader)
Three, the storage structure
1, M1 card is divided into 16 sectors, each sector consists of 4 blocks (block 0, block 1, block 2, block 3) composed of (we will also be the 16 sectors of the 64 blocks of the absolute address according to the number of 0 to 63, the storage structure is shown in the following chart:
2, block 0 of sector 0 (i.e., absolute address 0 block), which is used to store the manufacturer's code, has been solidified, unchangeable.
3. Block 0, block 1, and block 2 of each sector are data blocks, which can be used to store data.
The data block can be used for two applications:
★ Used for general data storage, you can read and write operations.
★ Used as a data value, you can initialize the value, add value, subtract value, read value operations.
4, each sector of the block 3 for the control block, including the password A, access control, password B.
Four, the principle of operation
The electrical part of the card consists of only an antenna and ASIC.
Antenna: the card's antenna is only a few sets of coils of wire, it is very suitable for packaging into the IS0 card.
ASIC: The card's ASIC consists of a high-speed (106KB baud rate) RF interface, a control unit and an
8K-bit EEPROM.
Working principle: read-write to the M1 card send a fixed frequency of electromagnetic waves, the card has a LC series resonance circuit, the frequency of which is the same as the frequency of the hearing and writing transmissions, in the electromagnetic wave under the excitation, the LC resonance circuit produces *** vibration, so that the capacitance of the charge in the capacitance, in the capacitance of the other side, there is a single conductive electronic pump connected to the capacitance of the charge sent to another Capacitor storage, when the accumulated charge reaches 2V, this capacitor can be used as a power supply for other circuits to provide operating voltage, the card data to transmit or receive read-write data.
V. M1 radio frequency card and reader communication
Reset answer (Answer to request)
M1 radio frequency card communication protocol and communication baud rate is defined, when a card into the reader operation range, the reader to a specific protocol and communication with it, so as to determine whether the card is a M1 radio frequency card, that is, to verify the card's card type. card type.
Anticollision Loop
When more than one card enters the reader's operating range, the Anticollision Loop selects one of the cards for operation, while the unselected cards are in idle mode waiting for the next selection, which returns the serial number of the selected card.
Select Tag
Selects the serial number of the selected card and returns the card's capacity code.
Three Mutual Confirmation (3 Pass Authentication)
After selecting the card to be processed, the reader determines the sector number to be accessed and performs a cryptographic verification of the sector code, and after three mutual authentication it can communicate through an encrypted stream. (When another sector is selected, another sector password check must be performed.)
Operations on data blocks
Read: reads a block;
Write: writes a block;
Add: adds a value to a block of values;
Decrement: subtracts a value from a block of values;
Store
Transfer: writes the contents of the data register to the block;
Halt: places the card in a suspended state.