AM79C989
Description
The Am79C989 Quad Ethernet Switching Transceiver (QuEST™) is a four-port physical layer (PHY) device that provides all of the analog functions needed for a 10BASE-T switch, including four independent Manchester Encode/Decode units (MENDECs) and four independent 10BASE-T transceivers.
Key Features
- of the QuEST device is the Quad AMD Switching Interface (QuASI) which multiplexes the data for all four channels into one set of pins
- This minimizes the pin count and size of the QuEST device and substantially reduces overall system cost
- The Am79C989 device provides an Interrupt pin to indicate changes in the internal status of the device
- The interrupt function reduces CPU polling of status registers and allows fast response time to changes in physical layer conditions
- 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# 21173 Rev: B Amendment/+2 Issue Date: April 1997 P R E L I M I N A R Y
