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# 21620 rev: a amendment/ 0 issue date: november 1997 qfexr-eval-kit evaluation kit for the am79c871 device distinctive kit characteristics: n standalone 100base-t repeater evaluation board with qfexr device n supports 12 100base-t ports n leds provide link and partition status n demonstrates qfexr design interface with external mlt-3 devices n various debugging features onboard general description the qfexr evaluation kit is an evaluation platform for the am79c871 quad fast ethernet transceiver for 100base-x repeaters (qfexr). the evaluation board functions as a standalone 100base-t unmanaged re- peater. twelve 100base-t ports are provided. the design demonstrates the shared mii interface to the repeater device, as well as the interface to external mlt-3 devices. the repeater device offers a 12-port shared mii interface, which reduces pin count over a standard mii port, but preserves complete ieee802.3u functionality. testpoints are available for probing the evaluation board with logic analyzers and oscillo- scopes. the three qfexr devices on the evaluation board interface to external mlt-3 devices. mlt-3 de- vices from two vendors are used to demonstrate the signal interface and layout when combined with the qfexr. complete schematics and layout information is included in the kit. the qfexr board provides leds to show link from the qfexr devices and partition status from the re- peater device. jumpers provide access to options on the qfexr devices. the qfexr board is powered by a dc power supply (not included). qfexr evaluation kit contents n cover letter n 12 port qfexr evaluation board n qfexr product brief n qfexr am79c871 datasheet n qfexr evaluation board instructions n 12-port qfexr evaluation board schematics, lay- out and parts list n qfexr application note, ?esigning 100base-tx systems with the qfex family n presentation, ?esigning with the amd qfex phy family
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