VSC8238 transport physical layer vppd-01657 revision 1.0 VSC8238 VSC8238 ffe/dfe eq limiting amplifier and cdr error proxy micro-controller interface agc 10.3125 gbps rxdata_out 10.3125 gbps rxdata_in link monitor initialization and control 10.3125 gbps advanced electronic equalization with limiting amplifier, and clock and data recovery features: applications: block diagram: benefits: ` multitap ffe and dfe filter ` integrated cdr and xfi output driver ` integrated agc and offset controls ` provides superior modal dispersion compensation and exceeds 10gbase-lrm specifications ` provides xfp-compatible rx cdr for xpf lrm module applications ` provides robust handing of wide tia input signal range and duty cycle conditions ` xenpak/x2 10gbase-lrm module applications ` xfp 10gbase-lrm module applications ref_sel ltref refclk eq_out to micro-controller rstn lf (ext cap) agc_in agc equalizer, limiting amplifier, and cdr rxlol spi or parallel interface link monitor link monitor functional block diagram:
trademarks tm vitesse, asic-friendly, fibretimer, timestream, snoop loop, super fec, focusconnect, meigs-ii, meigs-iie, lansing, campbell-i, barrington, pacemaker, hovcat48, hovcat48e, hovcat192, hovcat192e, micro phy, focus32, focus16, iq2200, nexsas, versacat, gigastream, hawx, sparx, stax, vstax, simpliphy,veriphy, actiphy, xfp pro, sfp pro, smart-link, octalmac, eq technology are trademarks in the uni ted states and/or other jurisdictions of vitesse semiconductor corporation. all other trademarks or registered trademarks mentioned herein are t he property of their respective holders. vitesse semiconductor corporation (?vitesse?) retains the right to make changes to its products or specifications to improve pe rformance, reliability or manufacturability. all information in this document, including descriptions of features, functions, performance, technical spec ifications and availability, is subject to change without notice at any time. while the information furnished herein is held to be accurate and reliable, no re sponsibility will be assumed by vitesse for its use. furthermore, the information contained herein does not convey to the purchaser of microelectronic devices any license under the patent right of any manufacturer. copyright ? 2006 741 calle plano camarillo, ca 93012, usa tel: +1 805.388.3700 fax: +1 805.987.5896 www.vitesse.com sales@vitesse.com VSC8238 ieee802.3aq/d3.1 220 m post-cursor, pre-cursor, and split-symmetric stressor performance as a function of log ber versus snr (nominal conditions, input: ~400 mv differential) 220 m post-cursor 220 m pre-cursor 220 m split-symmetric split-symmetric snr pre-cursor snr post-cursor snr ber ?15 ?14 ?13 ?12 ?11 ?10 ?9 ?8 ?7 ?6 ?5 ?4 21 23 25 27 29 31 33 35 snr (dbe) split-symmetric passing region post-cursor passing region pre-cursor passing region log (ber) VSC8238 general description: specifications: 10.3125 gbps advanced electronic equalization with limiting amplifier, and clock and data recovery the VSC8238 device is a compact, fully integrated electronic dispersion compensator (edc) and provides clock and data recovery (cdr) unit incorporating a sophisticated feed-forward equalization (ffe) and decision feedback equalization (dfe) architecture. the device is designed to operate at 10.3125 gbps for use in 10gbase-lrm ethernet applications. the receive chain within the VSC8238 device incorporates a low-noise automatic gain-controlled amplifier, a high-speed adaptive equalizer with linear and nonlinear compensation, a jitter-tolerant clock and data recovery, and a precision-limiting amplifier. the 10.3125 gbps output signal is xfi-compliant. the equalizer implementation provides a high level of signal impairment compensation to ensure a robust lrm link. it also provides the adequate performance margin needed for demanding multimode fiber applications. the VSC8238 device is the only edc on the market meeting the lx-4 compliant performance to enable 10 gbe transmission up to 300 meters on 99% of the installed fddi fiber base. ` exceeds ieee 802.3aq draft 4.0 specifications for 10gbase-lrm performance ` passes the following lrm stressor tests: - split-symmetric 4.75 db pie-d stressor (300 m) - post-cursor 4.56 db pie-d stressor (300 m) - pre-cursor 4.48 db pie-d stressor (300 m) VSC8238 stressor electrical performance:
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