AT88SA102S-TH-T Atmel, AT88SA102S-TH-T Datasheet - Page 6

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

Specifications of AT88SA102S-TH-T

• Lead Free Status / RoHS Status: Supplier Unconfirmed

2.
2.1.
6
IO Protocol
Communications to and from the AT88SA102S take place over a single asynchronously timed wire using a pulse count
scheme. The overall communications structure is a hierarchy:
Table 2.
Refer to Applications Notes on Atmel’s website for more details on how to use any microprocessor to easily generate
the signaling necessary to send these values to the chip.
IO Tokens
There are a number of IO tokens
The waveforms are the same in either direction, however there are some differences in timing based on the expectation
that the host has a very accurate and consistent clock while CryptoAuthentication has significant part to part variability
in its internal clock generator due to normal manufacturing and environmental fluctuations.
The bit timings are designed to permit a standard UART running at 230.4K baud to transmit and receive the tokens
efficiently. Each byte transmitted or received by the UART corresponds to a single bit received or transmitted by
CryptoAuthentication. Refer to Applications Notes on Atmel’s website for more details.
AT88SA102S
Tokens
Flags
Blocks
Packets
Input: (ToAT88SA102S)
Output: (FromAT88SA102S)
Wake
Zero
One
ZeroOut
OneOut
Implement a single data bit transmitted on the bus, or the wake-up event.
Comprised of eight tokens (bits) which convey the direction and meaning of the next group of bits (if any)
which may be transmitted.
Of data follow the command and Transmit flags. They incorporate both a byte count and a checksum to
ensure proper data transmission
Of bytes form the core of the block without the count and CRC. They are either the input or output
parameters of a CryptoAuthentication command or status information from CryptoAuthentication
IO Hierarchy
Wake CryptoAuthentication up from sleep (low power) state
Send a single bit from system to CryptoAuthentication with a value of 0
Send a single bit from system to CryptoAuthentication with a value of 1
Send a single bit from CryptoAuthentication to the system with a value of 0
Send a single bit from CryptoAuthentication to the system with a value of 1
that may be transmitted along the bus:
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