XRT91L34

XRT91L34 QUAD CHANNEL MULTIRATE STS-12/3/1 AND STM-4/1/0 SONET/SDH CDR OCTOBER 2007 REV. 1.0.1 GENERAL DESCRIPTION The XRT91L34 is a fully integrated quad channel multirate Clock and Data Recovery (CDR) device for SONET/SDH 622.08 Mbps STS-12/STM-4 or 155.52 Mbps STS-3/STM-1 or 51.84 Mbps STS-1/STM-0 applications. The device provides Clock and Data Recovery (CDR) function by synchronizing its on-chip Voltage Controlled Oscillator (VCO) to the incoming serial data stream. The device internally monitors Loss of Lock (LOL) conditions and automatically mutes recovered data upon Loss of Signal (LOS) conditions. CLOCK AND DATA RECOVERY OVERVIEW The clock and data recovery (CDR) unit accepts the high speed NRZ serial data from the LVDS or Differential LVPECL receiver and generates a clock that is the same frequency as the incoming data. The CDR block uses a reference clock to train and monitor its clock recovery PLL. All four channels share a single 77.76MHz or 19.44MHz reference clock. Upon startup, the PLL locks to the local reference clock. Once this is achieved, the PLL FIGURE 1. BLOCK DIAGRAM OF XRT91L34 attempts to lock onto the incoming receive serial data stream. Whenever the recovered clock frequency deviates from the local reference clock frequency by more than approximately ±500 ppm, the clock recovery PLL will switch and lock back onto the local reference clock and declare a Loss of Lock. Whenever a Loss of Lock or a Loss of Signal event occurs, the CDR will continue t...