AT76C902 ATMEL

Document overview

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Technical content

Features

  • ARM946E-STM Core (ARM9) for implementing the VoIP Protocol, TCP/IP, VPN and Controlling the Phone Functions with Internal 8K Instruction Cache and 8K Data Cache Used for Fast Execution of the Communications Protocols and RTOS with Reduced Power Consumption  ARM7TDMITM Core (ARM7) for Implementing the 802.11 MAC Layer  Configurable Memory Banks to Assign Memory where Best Needed in Chip Addition to Acoustic Echo Cancellation  Integrated Audio Codec with Two Differential Multiplexed Microphone Inputs, One Differential Speaker Output and One Differential Auxiliary Output Path  Glueless External Memory Interface Supporting up to 16 MB of External SRAM, 16 MB of Flash and 512 MB of SDRAM  Hardware Security Accelerators Attached to the Common Bus Offer Instantaneous Encryption/Decryption and Authentication Support for the Following Algorithms: CCM/CTR/CBC Modes of Advanced Encryption Standard (AES) DES/3DES,WEP64/128, Temporal Key Integrity Protocol (TKIP) and MD-5, SHA-1 Hash Functions for IP Security  USB Slave Interface (Control, Interrupt, Bulk-in and Bulk-out Endpoints)  UART with Support to be used as USART  Serial Peripheral Interface (SPI) and Two Wire Serial Interface (TWI)  64-key Keypad Interface  4x4 LED Matrix Controller  Minimum of 5 GPIO Pins (up to 62 Available on Configuration)  208-lead BGA Package  1.8 Volt Core Voltage Supply  3.3 Volt I/O Voltage Supply Figure 0-1. Typical Application Using AT76C902 n Usin 76C9 02 DSP Subsystem External Bus Interface ARM7TDMI

802.11 MAC

802.11 PHY 802.11 Interface AT76C902 ARM946E-S Protocol Handling Control Peripherals Audio Codec Flash SRAM Speaker Microphone TWI Bus - Battery Management - Voltage regulation - LCD Bias - Other Phone ASICs Audio to Headset Serial Port Accessory Controls Battery Charge Voltage Wireless VoIP Processor Implementing the 802.11 Standard AT76C902 Summary 5655AS–VoIP–09/06

5655AS–VoIP–09/06 AT76C902 Summary 1. Description AT76C902 is a highly integrated ASSP that can be used as part of a wireless phone that utilizes an 802.11a/b/g wireless LAN medium and carries voice over IP (VoIP) packets. Specified in this datasheet, an ARM® processor based subsystem performs all of the PLCP and low MAC func- tions and baseband operations defined in 802.11a/b/g. A TeakDSPCore™and an internal CODEC perform the decoding and encoding of voice traffic. An interrupt controller and multiple support peripherals are also included.

1.1 Applications

The VoIP baseband device is intended to be used in a wireless phone which operates by encap- sulating voice data within IP frames and transmitting the frames over a contention based wireless medium. Specifically, the first applicati on of the device is targeted at a wireless phone Figure 0-1 shows an example of the device being utilized in a wireless phone.

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