AT88SA102S_10 ATMEL [ATMEL Corporation], AT88SA102S_10 Datasheet - Page 10

• Manufacturer Part Number: AT88SA102S_10
• Description: Atmel CryptoAuthentication
• Manufacturer: ATMEL [ATMEL Corporation]

4.1.
4.1.1. Command Timing
4.1.2. Transmit Flag
10
IO Flags
The system is always the bus master, so before any IO transaction, the system must send an 8-bit flag
to indicate the IO operation that is to be performed, as follows:
All other values are reserved and will be ignored.
As the single signal wire may be shared with an Atmel
chip includes a PauseLong command which causes it to ignore all activity on the signal pin until the expiration of
the watchdog timer.
After a command flag is transmitted, a command block should be sent to the chip. During parsing of the
parameters and subsequent execution of a properly received command, the chip will be busy and not respond to
transitions on the signal pin. The delays for these operations are listed in the table below:
Table 4-1.
In this document, t
the chip.
The Transmit flag is used to turn around the signal so that the Atmel
system, depending on its current state. The bytes that the AT88SA102S returns to the system depend on its
current state as follows:
Atmel AT88SA102S
Value
0x77
0x88
0xCC
Parsing Delay
MacDelay
MemoryDelay
Fuse Delay
SecureDelay
PersonalizeDelay
Parameter
Name
Command
Transmit
Sleep
Command Timing
t
t
t
t
t
t
EXEC
PARSE
EXEC_MAC
EXEC_READ
EXEC_SECURE
PERSON
EXEC_FUSE
Symbol
is used as shorthand for the delay corresponding to whatever command has been sent to
Meaning
After this flag, the system starts sending a command block to the chip. The first bit of the block
can follow immediately after the last bit of the flag.
After a turn-around delay, the chip will start transmitting the response block for a previously
transmitted command block.
Upon receipt of a sleep flag, the chip will enter a low power mode until the next Wake token is
received.
Max
100
700
30
36
13
3
Unit Notes
ms
ms
ms
ms
µs
µs
Delay to check CRC and parse opcode and parameters before an error
indication will be available
Delay to execute MAC command
Delay to execute Read command
Delay to execute BurnFuse command at V
See Section 5.3 for more details.
Max delay to execute BurnSecure command at V
See Section
Delay to execute GenPersonalizationKey
®
CryptoAuthentication host chip, the Atmel AT88SA102S
5.5
for more details.
®
AT88SA102S can send data back to the
cc
> 4.5V
cc
> 4.5V
8584F–SMEM–8/10
to the chip