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AT88SA102S-SH-T 数据表(PDF) 10 Page - ATMEL Corporation

部件名 AT88SA102S-SH-T
功能描述  Atmel CryptoAuthentication
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT88SA102S-SH-T 数据表(HTML) 10 Page - ATMEL Corporation

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10
Atmel AT88SA102S
8584F–SMEM–8/10
4.1.
IO Flags
The system is always the bus master, so before any IO transaction, the system must send an 8-bit flag
Value
to the chip
to indicate the IO operation that is to be performed, as follows:
Name
Meaning
0x77
Command
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.
0x88
Transmit
After a turn-around delay, the chip will start transmitting the response block for a previously
transmitted command block.
0xCC
Sleep
Upon receipt of a sleep flag, the chip will enter a low power mode until the next Wake token is
received.
All other values are reserved and will be ignored.
As the single signal wire may be shared with an Atmel
® CryptoAuthentication
 host chip, the Atmel AT88SA102S
chip includes a PauseLong command which causes it to ignore all activity on the signal pin until the expiration of
the watchdog timer.
4.1.1. Command Timing
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.
Command Timing
Parameter
Symbol
Max
Unit
Notes
Parsing Delay
t
PARSE
100
µs
Delay to check CRC and parse opcode and parameters before an error
indication will be available
MacDelay
t
EXEC_MAC
30
ms
Delay to execute MAC command
MemoryDelay
t
EXEC_READ
3
ms
Delay to execute Read command
Fuse Delay
t
EXEC_FUSE
700
µs
Delay to execute BurnFuse command at V
cc > 4.5V
See Section 5.3 for more details.
SecureDelay
t
EXEC_SECURE
36
ms
Max delay to execute BurnSecure command at V
cc > 4.5V
See Section 5.5 for more details.
PersonalizeDelay
t
PERSON
13
ms
Delay to execute GenPersonalizationKey
In this document, t
EXEC is used as shorthand for the delay corresponding to whatever command has been sent to
the chip.
4.1.2. Transmit Flag
The Transmit flag is used to turn around the signal so that the Atmel
® AT88SA102S can send data back to the
system, depending on its current state. The bytes that the AT88SA102S returns to the system depend on its
current state as follows:


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