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AM79761YC-14 Datasheet(PDF) 1 Page - Advanced Micro Devices |
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AM79761YC-14 Datasheet(HTML) 1 Page - Advanced Micro Devices |
1 / 20 page PRELIMINARY This document contains information on a product under development at Advanced Micro Devices. The information is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice. Publication# 21560 Rev: A Amendment/+1 Issue Date: April 1998 Am79761 Physical Layer 10-Bit Transceiver for Gigabit Ethernet (GigaPHY™-SD) DISTINCTIVE CHARACTERISTICS n Gigabit Ethernet Transceiver operates at 1.25 Gigabits per second (Gbps) n Suitable for both Coaxial and Optical Link applications n 10-bit TTL Interface for Transmit and Receive Data n Monolithic Clock Synthesis and Clock Recovery requires no external components n Word Synchronization Function (Comma Detect) n Low Power Operation - 700 mW typical n 64-pin Standard PQFP — 14 x 14 mm (0˚ C - 70˚ C) — 10 x 10 mm (0˚ C - 50˚ C) n 125 MHz TTL Reference Clock n Loopback Diagnostic n Single +3.3 V Supply GENERAL DESCRIPTION The Am79761 Gigabit Ethernet Physical Layer Serial- izer/Deserializer (GigaPHY-SD) device is a 1.25 Gbps Ethernet Transceiver optimized for Gigabit Ethernet/ 1000BASE-X applications. It implements the Physical Medium Attachment (PMA) layer for a single port. The GigaPHY-SD device can interface to fiber-optic media to support 1000BASE-LX and 1000BASE-SX applications and can interface to copper coax to sup- port 1000BASE-CX applications. The functions performed by the device include serializ- ing the 8B/10B 10-bit data for transmission, deserializ- ing received code groups, recovering the clock from the incoming data stream, and word synchronization. When transmitting, the GigaPHY-SD device receives 10-bit 8B/10B code groups at 125 million code groups per second. It then serializes the parallel data stream, adding a reference clock, and transmits it through the PECL drivers. When receiving, the GigaPHY-SD device receives the PECL data stream from the network. It then recovers the clock from the data stream, deserializes the data stream into a 10-bit code group, and transmits it to the Physical Coding Sublayer (PCS) logic above. Option- ally, it detects comma characters used to align the in- coming word. |
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