AT88SA102S-TH-T Atmel, AT88SA102S-TH-T Datasheet - Page 11

• Manufacturer Part Number: AT88SA102S-TH-T
• Manufacturer: Atmel

Specifications of AT88SA102S-TH-T

• Lead Free Status / RoHS Status: Supplier Unconfirmed

4.1.2. Transmit Flag
4.1.3. Sleep Flag
8584D–SMEM–5/10
The Transmit flag is used to turn around the signal so that the 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:
Table 6.
CryptoAuthentication 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, status/error, CRC x 2.
After receipt of a command block, CryptoAuthentication will parse the command for errors, a process which takes t
(Refer to Section 4.1.1). After this interval the system can send a Transmit token to CryptoAuthentication – if there was
an error then CryptoAuthentication will respond with an error code. If there is no error then CryptoAuthentication
internally transitions automatically from t
are complete.
The sleep flag is used to transition CryptoAuthentication to the low power state, which causes a complete reset of
CryptoAuthentication’s internal command engine and input/output buffer. It can be sent to CryptoAuthentication at any
time when CryptoAuthentication will accept a flag.
To achieve the specified I
To achieve I
to avoid additional leakage on the input circuit of the chip.
The system must calculate the total time required for all commands to be sent to CryptoAuthentication during a single
session, including any inter-bit/byte delays. If this total time exceeds t
of commands, then a Sleep flag, then a Wake token, and finally after the Wake delay the remaining commands.
After Wake, but prior to first
command
After successful command
execution
Execution error
After CRC or other
communications error
State Description
SLEEP
Return Codes
if the sleep state of the input pin is high, the voltage on the input signal should be within 0.5V of V
SLEEP
, Atmel recommends that the input signal be brought below V
Error/Status
0xFF
0x11
0x0F
–
PARSE
to t
Indication that a proper Wake token has been received by
CryptoAuthentication.
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
CryptoAuthentication repeatedly if a re-read of the output is
necessary.
Command was properly received but could not be executed by
CryptoAuthentication. Changes in CryptoAuthentication state or the
value of the command bits must happen before it is re-attempted.
Command was NOT properly received by CryptoAuthentication and
should be re-issued by the system. No attempt was made to execute
the command.
EXEC
and will not respond to any Transmit tokens until both delays
WATCHDOG
Description
then the system must issue a partial set
IL
AT88SA102S
when the chip is asleep.
PARSE
11
CC