AFS090 datasheet(246/334 Pages) MICROSEMI

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Device Architecture

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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 Fusion Security 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 × 1038 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 Fusion

Security

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 Fusion FPGA Fabric User’s Guide 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 ProASICPLUS® 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 Fusion FPGA Fabric User’s Guide for more

details.

AFS090 Datasheet(PDF) 246 Page - Microsemi Corporation

AFS090 Datasheet(HTML) 246 Page - Microsemi Corporation

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