U1AFS600-2FG256YI
| Model | U1AFS600-2FG256YI |
| Description | Field Programmable Gate Array, |
| PDF file | Total 334 pages (File size: 18M) |
| Chip Manufacturer | MICROSEMI |
Fusion Family of Mixed Signal FPGAs
high level security by simply sending a STAPL file with AES-encrypted data. Highly secure remote field
updates over public networks (such as the Internet) are possible by sending and programming a STAPL
file with AES-encrypted data. For more information, refer to the
application note.
128-Bit AES Decryption
The 128-bit AES standard (FIPS-197) block cipher is the National Institute of Standards and Technology
(NIST) replacement for DES (Data Encryption Standard FIPS46-2). AES has been designed to protect
sensitive government information well into the 21st century. It replaces the aging DES, which NIST
adopted in 1977 as a Federal Information Processing Standard used by federal agencies to protect
sensitive, unclassified information. The 128-bit AES standard has 3.4 × 10
38
possible 128-bit key
variants, and it has been estimated that it would take 1,000 trillion years to crack 128-bit AES cipher text
using exhaustive techniques. Keys are stored (protected with security) in Fusion devices in nonvolatile
flash memory. All programming files sent to the device can be authenticated by the part prior to
programming to ensure that bad programming data is not loaded into the part that may possibly damage
it. All programming verification is performed on-chip, ensuring that the contents of Fusion devices remain
as secure as possible.
AES decryption can also be used on the 1,024-bit FlashROM to allow for remote updates of the
FlashROM contents. This allows for easy support of subscription model products and protects them with
measures designed to provide the highest level of security available. See the application note
for more details.
AES for Flash Memory
AES decryption can also be used on the flash memory blocks. This provides the best available security
during update of the flash memory blocks. During runtime, the encrypted data can be clocked in via the
JTAG interface. The data can be passed through the internal AES decryption engine, and the decrypted
data can then be stored in the flash memory block.
Programming
Programming can be performed using various programming tools, such as Silicon Sculptor II (BP Micro
Systems) or FlashPro3 (Microsemi).
The user can generate STP programming files from the Designer software and can use these files to
program a device.
Fusion devices can be programmed in-system. During programming, VCCOSC is needed in order to
power the internal 100 MHz oscillator. This oscillator is used as a source for the 20 MHz oscillator that is
used to drive the charge pump for programming.
ISP
Fusion devices support IEEE 1532 ISP via JTAG and require a single VPUMP voltage of 3.3 V during
programming. In addition, programming via a microcontroller in a target system can be achieved. Refer to
the standard or the "In-System Programming (ISP) of Microsemi's Low Power Flash Devices Using
FlashPro4/3/3X" chapter of the
for more details.
JTAG IEEE 1532
Programming with IEEE 1532
Fusion devices support the JTAG-based IEEE1532 standard for ISP. As part of this support, when a
Fusion device is in an unprogrammed state, all user I/O pins are disabled. This is achieved by keeping
the global IO_EN signal deactivated, which also has the effect of disabling the input buffers.
Consequently, the SAMPLE instruction will have no effect while the Fusion device is in this
unprogrammed state—different behavior from that of the ProASIC
PLUS®
device family. This is done
because SAMPLE is defined in the IEEE1532 specification as a noninvasive instruction. If the input
buffers were to be enabled by SAMPLE temporarily turning on the I/Os, then it would not truly be a
noninvasive instruction. Refer to the standard or the "In-System Programming (ISP) of Microsemi's Low
Power Flash Devices Using FlashPro4/3/3X" chapter of the
for more
details.
Revision 3
2- 231
