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PQ8020
8020 8020 MCC Manchester Code Converter TM 89305 Features Note: Check for latest Data Sheet revision before starting any designs. s Compatible with IEEE 802.3 /Ethernet (10BASE5), IEEE802.3/Cheapernet (10BASE2) and Ethernet SEEQ Data Sheets are now on the Web, at www.lsilogic.com. Rev. 1 Specifications s Compatible with 8003 ELDC® , 8005 Advanced This document is an LSI Logic document. Any reference to SEEQ Technology should be considered LSI Logic. EDLC s Manchester Data Encoding/Decoding and Receiver Clock Recovery with Phase Locked Loop (PLL) s Receiver and Collision Squelch Circuit and Noise Rejection Filter s Low Power CMOS Technology with Single 5V Supply s 20 pin DIP & PLCC Packages s Differential TRANSMIT Cable Driver s Loopback Capability for Diagnostics and Isolation s Fail-Safe Watchdog Timer Circuit to Prevent Continuous Transmission Description s 20 MHz Crystal Oscillator s Transceiver Interface High Voltage (16 V) Short Circuit Protection The SEEQ 8020 Manchester Code Converter chip provides the Manchester data encoding and decoding functions of the Ethernet Local Area Network physical layer. It interfaces to the SEEQ 8003 and 8005 Controllers and any standard Ethernet transceiver as defined by IEEE 802.3 and Ethernet Revision 1. Functional Block Diagram Pin Configuration DUAL-IN LINE TOP VIEW MODE 1 1 20 V CC GND 2 19 Tx+ LPBK/WDTD 3 18 Tx– Rx+ 4 17 TxD TxEN WATCHDOG TIMER Rx– TxC TxEN 7 14 X1 RxC 8 13 X2 RxD 9 12 COLL+ VSS 10 11 COLL– TRANSMIT LPBK/ WDTD VCC VSS CARRIER SENSE MUX Rx– 3 COLL+ 10MHz DETECTOR COLL– 2 Tx+ DECODER PLASTIC LEADED CHIP CARRIER TOP VIEW MODE 1 COLL Rx+ V CC RECEIVE RxC LPBK/WDTD XTAL CLOCK RxD 8020 MODE 1 GND CSN X1 TxC 15 Tx– TxD X2 16 6 COLL Tx+ ENCODER 5 CSN 1 20 19 COLLISION Rx+ 16 TxC 7 15 TxEN RxC 8 10 11 12 13 RxD GND COLL– COLL+ X2 14 9 1 MD400023/D 17 TxD 6 COLL MCC is a trademark of SEEQ Technology Inc. EDLC is a registered trademark of SEEQ Technology Inc. 18 Tx– 5 CSN Figure 1. 8020 MCC Manchester Code Converter Block Diagram. 4 Rx– X1
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