ATSHA204 ATMEL [ATMEL Corporation], ATSHA204 Datasheet - Page 23

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ATSHA204

Manufacturer Part Number
ATSHA204
Description
Atmel CryptoAuthentication
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet

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6.2
I
The transmission of data from the system to the AT88SA102S is summarized in Figure 6-4. The order of transmission is:
Figure 6-4. Normal I
Note:
The tables below label the bytes of the I/O transaction. The I
the AT24C16B datasheet.
Table 6-1.
Because the device treats the command input buffer as a FIFO, the input block can be sent to the device in one or many I
command blocks. The first byte sent to the device is the count, and so after the device receives that number of bytes, it will
ignore any subsequently received bytes until execution is finished.
The system must send a stop condition after the last command byte to ensure that the ATSHA204 will start the computation of
the command. Failure to send a stop condition may eventually result in a loss of synchronization (See Section 6.7 for recovery
procedures).
2
Atmel ATSHA204
Device Address
Word Address
Command
C Transmission to the Atmel ATSHA204 Device
SDA
Start Condition
Device Address Byte
Word Address Byte
Optional Data Bytes (1 through N)
Stop Condition
SCL
Condition
Start
SDA is driven low by the Atmel ATSHA204 during the ACK periods
I
2
S
C Transmission to Atmel ATSHA204
Address
Device
1-7
I
Device Address
Word Address
Data1-n
2
C Name
2
C Transmission to an Atmel ATSHA204
R/W
8
ACK
9
1
1-7
Address
Word
Description
This byte selects a particular device on the I
selected if bits 1-7 of this byte match bits 1-7 of the I2C_Address byte in the
configuration zone. Bit 0 of this byte is the standard I
zero to indicate a write operation (the bytes following the device address travel
from the master to the slave).
This byte should have a value of 0x03 for normal operation.
See Sections 6.2.2 and 6.6, below, for more information.
The command block, consisting of the count, command packet, and the two-byte
CRC. The CRC is calculated over the size and packet bytes. See Section 8.1.
8
ACK
9
1
1-7
Data 1
2
C name column provides the names of the bytes as described in
8
ACK
9
1
1-7
Data 2
Atmel ATSHA204 [DATASHEET]
8
2
C interface. The Atmel ATSHA204 is
ACK
9
1
2
C R/W bit, and should be
8740D−CRYPTO−3/12
1-7
Data N
8
ACK
9
1
Condition
2
Stop
C
P
23

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