EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 236

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

9–76
Available Security Modes
Cyclone III Device Handbook, Volume 1
There are several security modes available on Cyclone III LS devices, they are:
■
■
■
Volatile Key
Secure operation with volatile key programmed and required external battery—this
mode accepts both encrypted and unencrypted configuration bitstreams. Use the
unencrypted configuration bitstream support for board-level testing only.
No Key Operation
Only unencrypted configuration bitstreams are allowed to configure the device.
FACTORY Mode
After power up, Cyclone III LS devices must be in FACTORY mode to program the
volatile key. The FACTORY private JTAG instruction must be issued after the device
successfully exits from POR and before the device starts loading the core
configuration data to enable access to all other instructions from the JTAG pins. The
device configuration data and AES volatile key are cleared if the FACTORY instruction
is executed.
Table 9–25
each security mode.
Table 9–25. Security Modes Supported
Volatile Key
No Key
FACTORY
Volatile Key
No Key Operation
FACTORY Mode
Mode
Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
lists the configuration bitstream and the configuration mode supported for
Programming
Board-Level
Volatile Key
Function
Testing
Secure
—
Configuration
Unencrypted
Unencrypted
Encrypted
File
—
PS with AES (without decompression).
FPP with AES (without decompression).
Remote update fast AS with AES
(without decompression).
Fast AS (without decompression).
All configuration modes that do not
engage the design security feature.
All configuration modes that do not
engage the design security feature.
Allowed Configuration Mode
© December 2009 Altera Corporation
—
Design Security