Chip Description: AT88SC1604 is designed by the logic of the United States ATMEL Smart Card chip. It has a storage capacity of 15,704, is the logic of encrypted storage card products in a larger capacity chips. It has the complete isolation of the multi-partition structure, making "a multi-purpose card" functionality on the hardware has been fully protected; and its "control read and write" and "control erase" the password system allows two sets of cards in issue management and operation of safe and reliable use of the two sides will be practical.
Features:
(1) AT88SC1604 memory chips are more than one logical partition structure. In addition to the main memory into a specific symbol data area and control data area, the application data will be divided into four completely isolated sub-region, and in each sub-area with their reading, writing control flag, and write / erase the password and the password input error counters and other logic control.
(2) chip for the serial transmission, and to meet the ISO / IEC 7816-3 synchronous transmission protocol.
(3) chip low-power CMOS process, the time to read every word bits is 2 μs, write cycle is 5ms.
(4) chip designed voltage boost circuit, to ensure single +5 V supply voltage for the chip to complete the read / write / erase operations and other types of programming.
(5) on-chip memory cell has at least 10,000 erase / rewrite cycles. Data retention period of 10 years.
Chip Storage Structures
AT88SC1604 chip maker code area is divided into, publishers code area, the user password security zone, the count area more user password, personal code area, and four application areas. Password for each application area by area, password comparison count area, erase the password area and erase the password comparison count area, applications data area and memory test zone.
(1) The manufacturer code area (FZ)
The area used to record the card chip manufacturer specific information (such as: production batch number, date, and particular characteristics of the development code), the factory by the manufacturer before the chip is written. The fuse in the control area (FUSHl) did not fuse, the area of the storage unit can be as ordinary as the EEPROM location to erase and rewrite. Once the fuse blown, written by the "manufacturer code" will not be changed.
(2) Publisher Code Zone (IZ)
The area used to record the card issuer specific information (for example: issue batch number, date, region-wide number and characteristics of a particular user code number, etc.). When the control fuse is not blown this area, the area contents of the storage unit is free to erase or rewrite. In the individual treatment process is complete, the control area of fuse (FUSH2) fuse, can be injected into the "Issuer code" completely cured. This code is also the authenticity of identification cards, an important distinction between types of identification card applications.
(3) personal code area (CPZ)
The area used to store personal identification data. Chip area by using the "user password" protected. When the "user password" more successful, the district reading and writing can be erased. "Password" relatively unsuccessful, the district can only be read but not write and erase.
(4) user password District (SC)
The password area is the entire memory of the "total control switch." Before use, pre-entered by the authorized cardholder of a security code as a "reference the word" stored in the storage zone. Use, you must enter a "check password." The chip will enter the "check password" and the internal memory of the "reference word" one by one more. If the comparison is consistent, IC card chip storage will open up a whole (including the District's control password and the application data area). Districts "secure password" area SCn (n = l, 2,3,4) and the SC's role is entirely similar.
Password for each partition area SCn (n = 1,2,3,4), its corresponding comparison operation to be "application area password" more counter (SnAC) count control. When eight consecutive times for a password error, SCn will be locked.
(5) compare the password count area (SCAC)
The area of the continuous input of the cumulative number of times an incorrect password. When eight consecutive times after an incorrect comparison, the chip will be locked. After the chip is locked, will reject any of the erase, write and compare operations command.
The area is 8-bit, bit-write mode operation. Initialization of the chip is all "1" state, that is read is "FFH". Comparing the password each time when the press from high to low order to find the first "1" bit, this bit is written to "0", then enter the new "Check password" and the original is stored in the SC District's "character reference" for comparison. Comparison operation by the chip itself to complete on their own, while the comparison is by setting the flag to determine the SV, that is more successful when the SV is set to "1." Relatively unsuccessful, SV to maintain the original "0" state. 8 times more errors in a continuous process for each comparison, respectively, after the counter counts to "7FH", "3FH", "1FH", "0FH", "07H", "03H", "01H", "00H" . When the counter to "00H", the follow-up order because the comparison operation can not be "SCAC" area to find a "1" bit, and therefore refused to continue to chip comparison.
SnAC (n = 1,2,3,4) the role and SCAC is similar. Operational control is exactly the same. SCAC is the only limit to the SC area comparisons. The SnAC the limit SCn area comparisons. SCAC highest level of control. When the SCAC to "00H", the chip area blocked the SC comparison, so that a comparison of SCn also prohibited. If a non-SCAC "00H" value, in comparison to the SC area after the success of cryptographic operations, SCn can compare operation on the value of the state by the SnAC district to decide. SnAC District 8 times more input in a continuous process, for each comparison after the counter counts with the same value as the SCAC 8. (Ie are "7FH", "3FH", "1FH", "0FH", "07H", "03H", "OlH", "00H") when SnAC to "00H", then "Application n-" will be locked.
(6) to erase the password area (EZn, n = l.2, 3,4)
Erase the area used to store application area operations control password. These codes generally used by the issuer. Individual treatment in the last group of input "erase password", after the chip fuse FUSE2 fuse will "erase password" stored in the area. The area no longer can read, write and erase can only compare operation. In the course of the application area for erase operation, must first transfer the corresponding EZ area a "erase password" By comparison, in the "erase the password more counter" not to "00H" in the case, If you compare the two exactly the same code, the corresponding area of the unit allows the application of erase, or erase operation will be banned.
(7) to erase the password comparison count area (EnAC, n = l, 2,3,4)
Erase the password and compare the role of the count area is similar to the role of SCAC. Erase all application areas it entered the wrong password a continuous cumulative number of times. Up to 8 times an incorrect password more, the area controlled by the application of the erase operation incurs locked area, resulting in the application area may be read and written to allow a single state.
(8) application data area (AZn, n = 1,2,3,4)
The area mainly to the users. Used to store system data records and identification cards and other information. Application data area is written and read by the area's first two Pn and Rn and the SV flag state control, erase erase the password from the control area. AT88SC1604 designed four fully isolated partitions, partition 1 to 3 units of capacity are the 4K-bit, 4 partition unit capacity of 3.6K bits.
(9) Memory Test Zone (MTZ)
After the area is mainly used for chip EEPROM cell array of performance tests in the area of the control area without any protection of state and flag state, allowing the area to read, write and erase operations, but can not be compared operation.
Typical applications
Based on the characteristics of the 1604 chip, but with the rapid development of IC card technology, financial institutions, state agencies, companies, education sector and other more pressing needs in the area, apply more widely.
