AT88SA10HS(2009) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88SA10HS
(Rev.:2009)

CryptoAuthentication Host Security Chip

Atmel Corporation 

4. Commands

The command packet is broken down in the following way:

Byte

0

1

2-3

4+

Name

Opcode

Param1

Param2

Data

Meaning

The Command code

The first parameter – always present

The second parameter – always present

Optional remaining input data

If a command fails because the CRC within the block is incorrect or there is some other communications error, then

immediately after t PARSE the system will be able to retrieve an error response block containing a single byte packet.

The 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 the AT88SA10HS is in an illegal state for the execution of

this command, then immediately after tPARSE the system will be able to retrieve an error response block containing a

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 the AT88SA10HS.

If a command is received successfully, the system will be able to retrieve the output block as described in the individual

command descriptions below after the appropriate execution delay.

In the individual command description tables following, 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 returns an error.

12 AT88SA10HS Host Authentication Chip [Preliminary]

8595B–SMEM–09/09

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