AT88SA10HS_10 ATMEL [ATMEL Corporation], AT88SA10HS_10 Datasheet - Page 4

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AT88SA10HS_10

Manufacturer Part Number
AT88SA10HS_10
Description
Atmel CryptoAuthentication Host Security Chip
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.6.
2.
2.1.
4
Security Features
Atmel
release. These include an active shield over the entire surface of the part, internal memory encryption, internal
clock generation, glitch protection, voltage tamper detection and other physical design features.
Pre-programmed keys stored on AT88SA10HS are encrypted in such a way as to make retrieval of their values
via outside analysis very difficult.
Both the clock and logic supply voltage are internally generated, preventing any direct attack via the pins on these
two signals.
IO Protocol
Communications to and from AT88SA10HS; take place over a single asynchronously timed wire using a pulse
count scheme. The overall communications structure is a hierarchy:
Table 2-1.
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 AT88SA10HS has significant variation 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 the AT88SA10HS. Refer to Applications Notes on Atmel’s website for more details.
Atmel AT88SA10HS Host Authentication Chip
Tokens
Flags
Blocks
Packets
Input: (To AT88SA10HS)
Output: (From AT88SA10HS)
®
AT88SA10HS incorporates a number of physical security features designed to protect the keys from
Wake
Zero
One
ZeroOut Send a single bit from the AT88SA10HS to the system with a value of zero
OneOut Send a single bit from the AT88SA10HS 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
Data following the command and Transmit flags. They incorporate both a byte count and a checksum to ensure
proper data transmission
Bytes forming the core of the block without the count and CRC. They are either the input or output parameters of
an Atmel AT88SA10HS command or status information from the Atmel AT88SA10HS
IO Hierarchy
Wake the AT88SA10HS up from sleep (low power) state
Send a single bit from system to the AT88SA10HS with a value of zero
Send a single bit from system to the AT88SA10HS with a value of one
that may be transmitted along the bus:
8595F–SMEM–8/10

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