DM9161AEp product brief 10/100 mbps fast ethernet physic al layer single chip transceiver june 2008 rev.1.0 the dm9161a is a physical layer, singl e-chip, and low power transceiver for 100base-tx and 10base-t operations. on th e media side, it provides a direct interface either to unshielded twiste d pair category 5 cable (utp5) for 100base-tx fast ethernet, or utp5/utp 3 cable for 10base-t ethernet. through the media independent interface (mii), the dm9161a connects to the medium access control (mac) layer, ensuring a high inter operability from different vendors. thedm9161a uses a low power and high perf ormance advanced cmos process. it contains the entire physical layer func tions of 100base-tx as defined by ieee802.3u, including the physical coding sublayer (pcs), physical medium attachment (pma), twisted pair physical medium dependent sublayer (tp-pmd), 10base-tx encoder/decoder (enc/dec), and twisted pair media access unit (tpmau). the dm9161a provides a strong suppor t for the auto-negotiation function, utilizing automatic media speed and protoc ol selection. furthermore, due to the built-in wave shaping filter, the dm9161a need s no external filter to transport signals to the media in 100base-txbase-tx or 10base-tbase-t ethernet operation. block diagram mii signals mii interface/ control 4b/5b encoder 4b/5b decoder register code- group alignment descrambler serial to parallel nrzi to nrz rx crm mlt-3 to nrzi adaptive eq digital logic scrambler parallel to serial nrz to nrzi nrzi to mlt-3 mlt-3 driver rise/fall time ctl tx cgm led driver collision detection carrier sense auto- negotiation 10base-t module rx tx 125m clk 25m clk led1-4# 25m osci rxi+/- rxi+/- 10txd+/- 100txd+/- automdix
specifications ? fully comply with ieee 802.3 / ieee 802.3u 10base-t/ 100base-tx, ansi x3t12 tp-pmd 1995 standard ? support mdi/mdi-x auto cro ssover function (auto-mdi) ? support auto-negotiation function, compliant with ieee 802.3u ? fully integrated physical layer transceiver on-chip filtering with direct interface to magnetic transformer ? selectable repeater or node mode ? selectable mii or rmii (reduced m ii) mode for 100base-tx and 10base-tx. selectable mii or gpsi (7 -wired) mode for 10base-t ? selectable full-duplex or half-duplex operation ? mii management interface with mask able interrupt output capability ? provide loopback mode for easy system diagnostics ? led status outputs indicate link/ activity, speed10/100 and full-duplex/collision. support dual-led optional control ? single low power supply of 3.3v with an advanced cmos technology ? very low power consumption modes: power reduced mode (cable detection) power down mode selectable tx drivers for 1:1 or 1.25 :1 transformers for additional power reduction. 1: 1 transformers only when hp auto-mdix enable . ? compatible with 3.3v and 5.0v tolerant i/os, 48-pin lqfp application voip cpe (ata, ip phone, video phone) ip stb, ipc, internet radio ip cam, dvr, router? ordering information part number pin count package DM9161AE 48 lqfp DM9161AEp 48 lqfp(pb-free) davicom semiconductor, inc. no.6, li-hsin rd.vi, science pa rk, hsin-chu, taiwan, r.o.c. tel: 886-3-5798797 fax: 886-3-5646929 e-mail: sales@davicom.com.tw
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