AT88SA102S_10 ATMEL [ATMEL Corporation], AT88SA102S_10 Datasheet - Page 6

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

2.
2.2.
6
IO Protocol
Communications to and from the Atmel
a pulse count scheme. The overall communications structure is a hierarchy:
Table 2-1.
See 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 AT88SA102S 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 AT88SA102S. Refer to Applications Notes on Atmel’s website for more details.
Atmel AT88SA102S
Tokens
Flags
Blocks
Packets
Input: (ToAT88SA102S)
Output: (FromAT88SA102S)
IO Hierarchy
Wake
Zero
One
ZeroOut Send a single bit from AT88SA102S to the system with a value of zero
OneOut Send a single bit from AT88SA102S to the system with a value of one
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 an Atmel AT88SA102S command or status information from the Atmel AT88SA102S
Wake AT88SA102S up from sleep (low power) state
Send a single bit from system to AT88SA102S with a value of zero
Send a single bit from system to AT88SA102S with a value of one
that may be transmitted along the bus:
®
AT88SA102S take place over a single asynchronously timed wire using
8584F–SMEM–8/10