EP4SE360F35I4 Datasheet, PDF (404/432 Pages) Altera Corporation – This section provides a complete overview of all features relating to the Stratix IV device family, which is the most architecturlly advanced

10–68
Chapter 10: Configuration, Design Security, and Remote System Upgrades in Stratix IV Devices
Design Security
1 Enabling the tamper protection bit disables test mode in Stratix IV devices. This
process is irreversible and prevents Altera from conducting carry-out failure analysis
if test mode is disabled. Contact Altera Technical Support to enable the tamper
protection bit.
No Key Operation
Only unencrypted configuration bitstreams are allowed to configure the device.
Table 10–20 lists the different security modes and configuration bitstream supported
for each mode.
Table 10–20. Security Modes Supported
Mode (1)
Function
Configuration File
Volatile key
Secure
Board-level testing
Encrypted
Unencrypted
Non-volatile key
Secure
Board-level testing
Encrypted
Unencrypted
Non-volatile key with tamper
protection bit set
Secure (tamper resistant) (2)
Encrypted
Notes to Table 10–20:
(1) In No key operation, only the unencrypted configuration file is supported.
(2) The tamper protection bit setting does not prevent the device from being reconfigured.
Supported Configuration Schemes
The Stratix IV device supports only selected configuration schemes, depending on the
security mode you select when you encrypt the Stratix IV device.
Figure 10–30 shows the restrictions of each security mode when encrypting Stratix IV
devices.
Figure 10–30. Security Modes in Stratix IV Devices—Sequence and Restrictions
Volatile Key
Unencrypted or
Encrypted
Configuration File
No Key
Unencrypted
Configuration File
Non-Volatile Key
Unencrypted or
Encrypted
Configuration File
Stratix IV Device Handbook
Volume 1
Non-Volatile Key
with
Tamper-Protection
Bit Set
Encrypted
Configuration File
September 2012 Altera Corporation