ATAES132-SH-EQ-T Atmel, ATAES132-SH-EQ-T Datasheet - Page 21

• Manufacturer Part Number: ATAES132-SH-EQ-T
• Description: EEPROM AES 32Kbit EE SPI
• Manufacturer: Atmel

Specifications of ATAES132-SH-EQ-T

• Rohs: yes
• Maximum Clock Frequency: 10 MHz
• Operating Supply Voltage: 6 V
• Maximum Operating Temperature: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Interface Type: SPI
• Factory Pack Quantity: 4000

5.
5.2.
5.2.1.
5.2.2.
5.2.3.
Standard Serial EEPROM Read and Write Commands
This section provides a summary of the operations that can be performed using the standard Serial EEPROM read and write
commands. For detailed information see the specification sections that are referenced below.
Table 5-9.
Read
The ATAES132 supports the standard Serial EEPROM commands to read from the user memory. All bytes in the user
memory address space may be read, however, only bytes in the user zones in which neither authentication nor encryption is
required will return the actual data from the memory. All other locations will return the value 0xFF. See Appendix J for the I
read command and Appendix K for the SPI read command information.
When a read command is received, the device looks at the AuthRead and EncRead bits in the ZoneConfig register for the user
zone to determine whether to return 0xFF or the EEPROM data. If the EncRead bit is 1b or the AuthRead bit is 1b, then 0xFF
will always be returned.
If the ZoneConfig AuthRead bit is 1b and the EncRead is 0b, then the BlockRead command must be used to read the user
zone (see Section 7.4). If the EncRead bit is 1b, then the EncRead command must be used to read the user zone (see
Section 7.9).
The standard SPI and I
can cross EEPROM page boundaries.
Read the Response Memory Buffer
The host sends ATAES132 commands to the device by writing the command packet to the command memory buffer using a
standard SPI or I
response memory buffer. The host retrieves the response by reading the response packet using a standard SPI or I
command. See Appendix D for additional information. See Appendix G for examples.
When any error occurs the EERR bit of the STATUS register is set to 1b to indicate an error. See section G.1 for more
information.
Read the Key Memory or Configuration Memory
Reading the key memory is never allowed.
The read command can never be used to read data from the configuration memory. The BlockRead command is used to
access the configuration memory (see Section 7.4).
If a standard SPI or I
be returned for each byte. 0xFF is also returned for address locations which do not physically exist. The EERR bit of the
STATUS register is set to 1b if 0xFF was substituted for any byte returned by a read command. See section G.1 for more
information.
Read the STATUS Register
The host reads the STATUS register by reading address 0xFFF0. In SPI Interface mode the host can also read STATUS
using the RDSR command. See Appendix G for detailed information and examples.
Name
Read
Write
Standard Serial EEPROM read and write commands
2
Description
The read command is used to read cleartext from the user zones, to retrieve a response by
reading the response memory buffer, or to read the STATUS register
The write command is used to write cleartext to unrestricted memory, or to send a command by
writing the command packet to the command memory buffer. The write command is also used to
write the IO address reset register.
C write command. The ATAES132 processes the command packet and places the response in the
2
C read command is used within the configuration memory or key memory address space, then 0xFF will
2
C Read commands can be used to read any number of bytes in a single operation. Read operations
Atmel ATAES132 Preliminary Datasheet
8760A−CRYPTO−5/11
2
C read
2
C
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