AT88SC0404CA-MJ Atmel, AT88SC0404CA-MJ Datasheet - Page 15

• Manufacturer Part Number: AT88SC0404CA-MJ
• Description: IC EEPROM 4KBIT 4MHZ M2J
• Manufacturer: Atmel
• Series: CryptoMemory®r

Specifications of AT88SC0404CA-MJ

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 4K (512 x 8)
• Speed: 4MHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: M2 J, Smart Card Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.
6.1.
6.1.1. Password Verification
14
Communication Security Modes
Communication between the device and host operates in three basic modes. Standard mode is the default mode for
the device after power-up. Authentication mode is activated by a successful authentication sequence. Encryption mode
is activated by a successful encryption activation following a successful authentication. Data transferred to and from the
device is handled per the following table.
Figure 4. Communication Security Modes
Note:
Security Operations
The use of passwords protects read and write accesses to the user zones. Any one of eight password sets is available
for assignment to any user zone through configuration of access registers. Atmel
24-bit passwords for read and write operations. Read passwords grant only read accesses to zones under password
protection, while write passwords grant both read and write accesses. Successful presentation of any password
renders the verify password command active until the presentation of another password or device reset. Only one
password may be active at a time. Presenting incorrect passwords decrements the value of the corresponding
password attempts counter (PAC). Decrementing the PAC to $00 permanently disables the corresponding password
and permanently renders the corresponding user zone(s) under protection inaccessible. Operation in authentication or
encryption modes requires encryption of passwords for all password transactions.
Figure 5. Password Verification
Atmel AT88SC0104/0204/0404/0808/CA
Standard/Password
Authentication
Encryption
CryptoMemory Device
1. Configuration data includes the entire configuration memory except the passwords
2. MDC: Modification Detection Code
3. MAC: Message Authentication Code
Mode
VERIFY Password
Allow Access
Configuration Data
clear
clear
clear
Command/Communications
Verify Password
User Data
encrypted
clear
clear
Passwords
encrypted
encrypted
clear
®
Send Password
CryptoMemory
encrypted if performed after
Mutual Authentication
Host Logic
Data Integrity Check
®
provides separate
MDC
8664C–CRYPT–01/10
MAC
MAC