ATAES132-SH-ER Atmel, ATAES132-SH-ER Datasheet - Page 113

• Manufacturer Part Number: ATAES132-SH-ER
• Description: EEPROM AES 32Kbit EE I2C
• Manufacturer: Atmel

Specifications of ATAES132-SH-ER

• Rohs: yes
• Maximum Clock Frequency: 1 MHz
• Operating Supply Voltage: 6 V
• Maximum Operating Temperature: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Interface Type: I2C
• Factory Pack Quantity: 2300

I.15.1. Client Decrypt MAC
I.16.
If any of the optional authenticate fields are selected in the mode parameter, then a second authenticate-only block is included
in the MAC calculation.
In Client Decryption mode, the InMAC is calculated using the following 14 bytes in the default authenticate-only block:
If any of the optional authenticate fields are selected in the mode parameter, then a second authenticate-only block is included
in the MAC calculation.
The device MacCount will be changed to the EMacCount value when a decrypt command is received with the client decryption
mode is selected. The EMacCount will be used when decrypting the data and the MacCount will be incremented by the
decrypt operation. (After processing the command, the device MacCount will equal EMacCount plus one)
EncRead Command MAC
The OutMAC is calculated using the following 14 bytes in the default authenticate-only block:
If any of the optional authenticate fields are selected in the mode parameter, then a second authenticate-only block is included
in the MAC calculation.
4 bytes Usage counter value, or 0x00 if not selected or if KeyID is VolatileKey
8 bytes SerialNum[0:7], or 0x00 if not selected
4 bytes SmallZone[0:3], or 0x00 if not selected
2 bytes ManufacturingID
1 byte
1 byte
2 bytes Upper Byte = 0x00, Lower Byte = EKeyID
2 bytes Upper Byte = 0x00, Lower Byte = Lower Byte of Param2
1 byte
5 bytes 0x00
4 bytes 0x00 if Usage counter value is not selected, or 0x00 if KeyID is VolatileKey
8 bytes SerialNum[0:7], or 0x00 if not selected
4 bytes SmallZone[0:3], or 0x00 if not selected
2 bytes ManufacturingID
1 byte
6 bytes FirstBlock field containing
5 bytes 0x00
4 bytes Usage counter value, or 0x00 if not selected
8 bytes SerialNum[0:7], or 0x00 if not selected
4 bytes SmallZone[0:3], or 0x00 if not selected
Encrypt Opcode (0x06)
Mode
MacFlag = 0x01
EncRead Opcode (0x05)
1 byte
2 bytes
2 bytes
1 byte
Mode
Param1
Param2
MacFlag
Atmel ATAES132 Preliminary Datasheet
8760A−CRYPTO−5/11
113