ATMEGA128RFA1-ZU Atmel, ATMEGA128RFA1-ZU Datasheet - Page 92

• Manufacturer Part Number: ATMEGA128RFA1-ZU
• Description: IC AVR MCU 2.4GHZ XCEIVER 64QFN
• Manufacturer: Atmel
• Series: ATMEGAr

Specifications of ATMEGA128RFA1-ZU

• Frequency: 2.4GHz
• Data Rate - Maximum: 2Mbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: General Purpose
• Power - Output: 3.5dBm
• Sensitivity: -100dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 12.5mA
• Current - Transmitting: 14.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB Flash, 4kB EEPROM, 16kB RAM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VFQFN, Exposed Pad
• Rf Ic Case Style: QFN
• No. Of Pins: 64
• Supply Voltage Range: 1.8V To 3.6V
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Processor Series: ATMEGA128x
• Core: AVR8
• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 128 KB
• Data Ram Size: 16 KB
• Interface Type: JTAG
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 38
• Number Of Timers: 6
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVR128RFA1-EK1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.8.8 Security Module (AES)
9.8.8.1 Overview
9.8.8.2 Security Module Preparation
92
ATmega128RFA1
Protection prevents that a new valid frame passes to the Frame Buffer until the buffer
protection bit is cleared (RX_SAFE_MODE = 0).
A received frame is automatically protected against overwriting:
• in Basic Operating Mode, if its FCS is valid
• in Extended Operating Mode, if an TRX24_RX_END interrupt is generated
The Dynamic Frame Buffer Protection is enabled, if register bit RX_SAFE_MODE
(register TRX_CTRL_2, see
112) is set and the radio transceiver state is RX_ON or RX_AACK_ON.
Note that Dynamic Frame Buffer Protection only prevents write accesses from the air
interface not from the application software. The application software may still modify the
Frame Buffer content.
The security module (AES) is characterized by:
• Hardware accelerated encryption and decryption;
• Compatible with AES-128 standard (128 bit key and data block size);
• ECB (encryption/decryption) mode and CBC (encryption) mode support;
• Stand-alone operation, independent of other blocks;
See TBD Application regarding the AES security module usage.
The security module is based on an AES-128 core according to the FIPS197 standard
[5]. and provides two modes, the Electronic Code Book (ECB) and the Cipher Block
Chaining (CBC). The security module works independent of other building blocks of the
radio transceiver. Encryption and decryption can be performed in parallel to a frame
transmission or reception.
The ECB and CBC modules including the AES core are clocked with the 16 MHz Radio
Transceiver Crystal Oscillator.
Controlling the security block is possible over 5 Registers within AVR I/O space:
Table 9-24. Security Module Address Space Overview
The use of the security module requires a configuration of the security engine before
starting a security operation. The following steps are required:
Table 9-25. AES Engine Configuration Steps
Register Name
AES_STATUS
AES_CTRL
AES_KEY
AES_STATE
Step
1
Description
Key Setup
Description
AES status register
AES control register
Access to 16 Byte key buffer
Access to 16 Byte data buffer
"TRX_CTRL_2 – Transceiver Control Register 2" on page
Description
Write encryption or decryption key to KEY
buffer
(16 consecutive byte writes to AES_KEY)
8266A-MCU Wireless-12/09