AT88SA10HS_10 ATMEL [ATMEL Corporation], AT88SA10HS_10 Datasheet - Page 17

• Manufacturer Part Number: AT88SA10HS_10
• Description: Atmel CryptoAuthentication Host Security Chip
• Manufacturer: ATMEL [ATMEL Corporation]

5.7.
8595F–SMEM–8/10
The total BurnSecure execution delay is directly proportional to the total number of fuses being burned. If V
less than 4.5V, then the total BurnSecure execution time may exceed the interval remaining before the expiration
of the watchdog timer. In this case, the BurnSecure command should be run repeatedly, with each repetition
burning only as many fuses as there is time available. The system software is responsible for counting the
number of ‘1’ bits in the clear-text version of the map parameter sent to the chip – no error is returned if the fuse
burn count is too high. Other than Fuse[87] (see below), the fuses may be burned in any order.
Prior to execution of BurnSecure, Atmel
then the BurnSecure command will return an error. Fuse[87] must be burned during the last repetition of
BurnSecure, optionally in combination with other fuses.
There are a series of very small intervals during t
power supply must not be removed during this interval and the watchdog timer must not be allowed to expire
during this interval, or the fuse may end up in a state where it reads as un-burned but cannot be burned.
Table 5-13. Input Parameters
Table 5-14. Output Parameters
This command takes a constant time to execute regardless of the number of fuses being burned.
PauseShort
Forces the chip into a busy mode for a period of t
activity on the IO signal. This command is used to prevent bus conflicts in a system that also includes one or
more Atmel AT88SA100S or Atmel AT88SA102S client chips sharing the same signal wire.
Table 5-15. Input Parameters
Table 5-16. Output Parameters
Opcode
Param1
Param2
Data
Name
Success
Opcode
Param1
Param2
Data
Name
Success
Name
BURNSECURE
Decrypt
BurnTime
Map
Name
PAUSESHORT
Ignored
Ignored
Ignored
Size
Size
1
1
Notes
Upon successful execution, a value of zero will be returned by Atmel AT88SA10HS
Notes
After a delay of t
Transmit flag
Atmel AT88SA10HS Host Authentication Chip
Size
Size
11
1
1
2
1
1
2
0
Notes
0x10
If one, decrypt Map data before usage. If zero, the map is transmitted in plain text
Must be 0x00 00 if V
Which fuses to burn, may be encrypted
Notes
0x00
Must be 0x00
Must be 0x00 00
®
PAUSE
AT88SA10HS verifies that Fuse[87] is un-burned. If it has been burned,
, the Atmel AT88SA10HS will return a value of zero in response to a
EXEC_SECURE
PAUSE.
During execution of this command the chip will ignore all
CC
> 4.5V, must be 0x80 00 otherwise
when the fuse element is actually being burned. The
CC
is
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