AT88SA10HS_10 ATMEL [ATMEL Corporation], AT88SA10HS_10 Datasheet - Page 9

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AT88SA10HS_10

Manufacturer Part Number
AT88SA10HS_10
Description
Atmel CryptoAuthentication Host Security Chip
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
4.1.3. Transmit Flag
4.1.4. Sleep Flag
8595F–SMEM–8/10
The Transmit flag is used to turn around the signal so that the Atmel
system, depending on its current state. The bytes that the AT88SA10HS returns to the system depend on its
current state as follows:
Table 4-3.
The AT88SA10HS always transmits complete blocks to the system, so in the above table, the status/error bytes
result in 4 bytes going to the system – count, error, CRC x 2.
After receipt of a command block, the AT88SA10HS will parse the command for errors, a process which takes
t
there was an error, the AT88SA10HS will respond with an error code. If there is no error, the AT88SA10HS
internally transitions automatically from t
delays are complete.
The sleep flag is used to transition the AT88SA10HS to the low power state, which causes a complete reset of the
AT88SA10HS’s internal command engine and input/output buffer. It can be sent to the AT88SA10HS at any time
when the AT88SA10HS will accept a flag.
To achieve the specified I
asleep. To achieve I
0.5V of V
The system must calculate the total time required for all commands to be sent to the AT88SA10HS during a
single session, including any inter-bit/byte delays. If this total time exceeds t
partial set of commands, then a Sleep flag, then a Wake token, and finally after the Wake delay, issue the
remaining commands.
PARSE
State Description
After Wake, but prior to first
command
After successful command
execution
Execution error
After CRC or other
communications error
(Refer to Section 4.2.2). After this interval the system can send a Transmit token to the AT88SA10HS – if
CC
to avoid additional leakage on the input circuit of the chip.
Return Codes
SLEEP
if the sleep state of the input pin is high, the voltage on the input signal should be within
Atmel AT88SA10HS Host Authentication Chip
SLEEP
Error/Status Description
, Atmel recommends that the input signal be brought below V
0x0F
0xFF
0x11
PARSE
Indication that a proper Wake token has been received by the Atmel
AT88SA10HS
Return bytes per “Output Parameters” in Command section of this document.
In some cases this is a single byte with a value of 0x00 indicating success.
The Transmit flag can be resent to the Atmel AT88SA10HS repeatedly if a re-
read of the output is necessary
Command was properly received but could not be executed by the Atmel
AT88SA10HS. Changes in the Atmel AT88SA10HS state or the value of the
command bits must happen before it is re-attempted
Command was NOT properly received by the Atmel AT88SA10HS and should
be re-issued by the system. No attempt was made to execute the command
to t
EXEC
and will not respond to any Transmit tokens until both
®
AT88SA10HS can send data back to the
WATCHDOG
then the system must issue a
IL
when the chip is
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