ADLINK cPCI-3971 - Manual (Page 41)

Functional Description 27
cPCI-3970
The key features the TPM provides are:
X Hardware hash accelerator for SHA-1 algorithm.
X Advanced Crypto Engine (ACE) for asymmetric key opera-
tions (up to 2048-bit key length) to make hardware protec-
tion.
X Tick counter to extend the time required to decipher the key.
In addition to an encryption key created by the user, the TPM also
provides security features to protect the TPM itself:
X Over/Under-voltage detection to monitor the system stabil-
ity. If the voltage fluctuates dramatically, this function can
block the data transfer and lock the chip.
X Low/High frequency sensor to detect the IC clock fre-
quency. If the frequency fluctuates dramatically, this func-
tion can block the data transfer and lock the chip.
X Reset filter to filter reset signal in order to break the time set
by tick counter is received.
X Memory encryption to protect memory.
X Physical shield in the IC to protect the die from intruding or
hacking by matching the data transferred on the 2 layer
metal shield on the IC. If the data is not matched, the IC
may be blocked.
3.7 Battery
The cPCI-3970 is equipped with a 3.0V "coin cell" lithium battery
for the Real Time Clock (RTC). The battery socket is equipped on
the DB-3CAST/DB-3CF daughter board. The lithium battery must
be replaced with an identical battery or a battery type recom-
mended by the manufacturer. A Rayovac BR2032 with -40°C to
+85°C operating temperature support is equipped on board by
default. The coin cell battery can be replaced with a Gold Cap type
by request.
NOTE: NOTE:
The TPM does not support operation below 0ºC. Below this
temperature, the system may not boot. As a result, the
Extended Temperature version cPCI-ET3970 is not available
with TPM.