AT88SA102S-TH-T Atmel, AT88SA102S-TH-T Datasheet - Page 14

• Manufacturer Part Number: AT88SA102S-TH-T
• Manufacturer: Atmel

Specifications of AT88SA102S-TH-T

• Lead Free Status / RoHS Status: Supplier Unconfirmed

4.6.
5.
14
Byte & Bit Ordering
CryptoAuthentication is a little-endian chip:
• All multi-byte aggregate elements within this spec are treated as arrays of bytes and are processed in the order
• Data is transferred to/from CryptoAuthentication least significant bit first on the bus.
• In this document, the most significant bit and/or byte appears towards the left hand side of the page.
Commands
The command packet is broken down in the following way:
If a command fails because the CRC within the block is incorrect or there is some other communications error then
immediately after t
value of that byte will be all 1’s. In this situation, the system should re-transmit the command block including the
proceeding Transmit flag – providing there is sufficient time before the expiration of the watchdog timeout.
If the opcode is invalid, one of the parameters is illegal, or CryptoAuthentication is in an illegal state for the execution of
this command then immediately after t
single byte packet. The value of that byte will be 0x0F. In this situation, the condition must be corrected before the
(modified) command is sent back to CryptoAuthentication.
If a command is received successfully then after the appropriate execution delay the system will be able to retrieve the
output block as described in the individual command descriptions below.
In the individual command description tables below, the Size column describes the number of bytes in the parameter
documented in each particular row. The total size of the block for each of the commands is fixed, though that value is
different for each command. If the block size for a particular command is incorrect, the chip will not attempt the
command execution and return an error.
AT88SA102S
Byte
0
1
2-3
4 +
received.
Name
Opcode
Param1
Param2
Data
PARSE
the system will be able to retrieve an error response block containing a single byte packet. The
Meaning
The Command code
The first parameter – always present
The second parameter – always present
Optional remaining input data
PARSE
the system will be able to retrieve an error response block containing a
8584D–SMEM–5/10