EP2AGX95EF29C6N Datasheet, PDF (349/380 Pages) Altera Corporation – Device Interfaces and Integration

Chapter 9: Configuration, Design Security, and Remote System Upgrades in Arria II Devices
Design Security
9–63
Flexible Security Key Storage
Arria II devices support two types of security key programming—volatile and
non-volatile keys. Table 9–24 lists the differences between volatile keys and
non-volatile keys.
Table 9–24. Security Key Options
Options
Volatile Key
Non-Volatile Key
Key programmability
Reprogrammable and erasable One-time programmable
External battery
Required
Not required
Key programming method (1) On-board
On and off board
Design protection
Secure against copying and
reverse engineering.
Secure against copying and
reverse engineering.
Tamper resistant if volatile
Tamper resistant if tamper
tamper protection bit is set. (2) protection bit is set.
Notes to Table 9–24:
(1) Key programming is carried out using the JTAG interface.
(2) Arria II GZ devices do not support this feature.
You can program the non-volatile key to the Arria II device without an external
battery. Also, there are no additional requirements of any of the Arria II power supply
inputs.
V_CCBAT is a dedicated power supply for volatile key storage and not shared with other
on-chip power supplies, such as V_CCIO or V_CC. V_CCBAT continuously supplies power to
the volatile register regardless of the on-chip supply condition.
1 For Arria II GX devices, after power up, wait 100 ms (standard POR delay) or 4 ms
(fast POR delay) before beginning key programming to ensure that V_CCBAT is at full
rail. For Arria II GZ devices, after power up, wait 300 ms (PORSEL = 0) or 12 ms
(PORSEL = 1) before beginning key programming to ensure that V_CCBAT is at full rail.
f For more information about how to calculate the key retention time of the battery
used for volatile key storage, refer to the Arria II GX PowerPlay Early Power Estimator.
f For more information about battery specifications, refer to the Device Datasheet for
Arria II Devices chapter.
f For more information about the VCCBAT pin connection recommendations, refer to
Arria II Device Family Pin Connection Guidelines.
July 2012 Altera Corporation
Arria II Device Handbook Volume 1: Device Interfaces and Integration