Features • On-chip OFDM Baseband Supports All the Transmission Modes of the IEEE 802.11a • • • • • • • • • • • • • • • Specification and the OFDM Modes of the IEEE 802.11g Specification (6, 9, 12, 18, 24, 36, 48, and 54 Mbps) On-chip DSSS/CCK Baseband Supports All Transmission Modes of the IEEE 802.11b Specification (1, 2, 5.5, 11 Mbps) Single 20 MHz or 40 MHz Input Clock Generates the Internal System Clock and the 44 MHz Clock for the DSSS/CCK Baseband Low Pin Count Flexible MAC Layer Interface Flexible RF Interface Allows Glueless Communication with Various Dual Mode (802.11a/g) RF Devices On-chip Automatic Gain Control On-chip DC Offset Remove Mechanism Analog and Digital Gain Vector for the RF Transceiver SPI Interface for Configuration/Control 8 GPIO to Control External 11a/g PAs, On/Off of RF Devices and Antenna Diversity Digital or Analog Interface to the RF Devices Up to 4 Auxiliary Analog to Digital Converters (Depending On the Package) Up to 2 Auxiliary Purpose Digital to Analog Converters 1.8 Volt Core Voltage Supply 3.3 Volt I/O Voltage Supply 100-ball TFBGA Package 802.11a/b/g Baseband Controller AT76C517 Summary 802.11a/b/g BaseBand Controller PLL Clock Reset Test MAC I/F Debug BaseBand 11a/b/g Register File I DAC DAC Q ADC ADC I Q DAC DAC Tx VGA Rx VGA Analog Front End GPIO ADC ADC Aux0 Aux1 NOTE: This is a summary document. The complete document is available under NDA. For more information, please contact your local Atmel sales office. 5642AS–WLAN–07/06 1. Description The AT76C517 provides complete modem functionality for an 802.11a/b/g wireless LAN chip set. It contains signal processing functionality for both DSSS/CCK and OFDM modulation/demodulation. It supports both short and long PLCP preamble formats for 802.11b rates, while it incorporates efficient compensation algorithms for improving the performance of the OFDM modem part. The AT76C517 provides an interface to a MAC processor consisting of a bi-directional data bus, data synchronization signals and a serial-to-parallel port interface. The AT76C517 can exchange either payload data or TX/RX vector and payload data with the MAC over a bi-directional data bus in a half-duplex fashion using data synchronization signals. The interface allows the baseband and the MAC controllers to operate at different speeds incorporating FIFOs in both directions. The serial-to-parallel port interface provides access to all internal registers and is able to run up to 20 MHz. The AT76C517 is able to interface with various 802.11a/g radio devices using analog or proprietary digital I/Q interface, analog or digital signals for automatic gain control, gain lock indication, antenna diversity control, LNA “gain on” and various other signals which depict the state of internal critical circuits related to the front-end logic of the modem. 2. Functional diagram MAC Interface Descrambler/ Header/Payload to MAC Preamble/ Header formation Scrambler Scrambler Encoder Descrambler Barker/CCK Demodulator CS/CCA Assessment OFDM/ CCK/ Barker Selector Interleaver LMS-DF Equalizer Derotator Timing/ Frequency Sync I/Q mismatch Compensator Rough AGC Transmit Filter Receive Filter Fine AGC Deinterleaver/ Viterbi decoder Equalizer/ Phase Compensator Data mapper Barker/CCK Modulator Payload to MAC CS/CCA Assessment I/Q Mismatch Compensator FFT/ CP Extraction Derotator Timing/ Frequency Sync IFFT/ CP insertion TransmitFilter/ Power Control Receive Filter Fine AGC Radio Interface 2 AT76C517 Summary 5642AS–WLAN–07/06 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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