Transcription of JESD204B Physical Layer (PHY) - TI.com
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JESD204B Physical Layer (PHY) - TI.com
JESD204B Physical Layer (PHY) Texas Instruments High Speed Data Converter Training Overview What is the Physical Layer (PHY)? Speed Grades and Compliance Types SERDES Interface Solutions for Long/Lossy Channels Device Clock, SYSREF and SYNC~ Interfaces PCB Layout Recommendations 2 What is the Physical Layer (PHY)? The Physical Layer refers to the serial data transmitter and receiver of the JESD204B link Point-to-point, unidirectional serial interface Definition includes electrical and timing characteristics This presentation also considers the other signal interfaces 3 ADCL ogic DeviceClock DeviceSERDESSYNC~DEV. CLOCKSYSREFJESD204B Subclass 1 ADC InterfacesDACL ogic DeviceSERDESSYNC~Clock DeviceDEV. CLOCKSYSREFDEV. CLOCKSYSREFDEV. CLOCKSYSREFJESD204B Subclass 1 DAC InterfacesWhat is the Physical Layer (PHY)? 4 Pulse-Shaping / Emphasis(Optional)Bit-StreamParallel-to- SerialConverter(10:1 MUX)DifferentialCML DriverJESD204B Tx PHYCtrl/DataChar-StreamChannelJESD204B Rx PHYE qualizer(Optional)CDR(Clock/Data Recovery)Bit-StreamSerial-to-ParallelCon verter(1:10 DEMUX)Character AlignmentDifferentialCML ReceiverCtrl/DataChar-StreamSpeed Grades and Compliance 5 Parameter LV-OIF-Sx15 LV-OIF-6G-SR LV-OIF-11G-SR Data Rates - Differential Output Voltage 500 1000 (mV) 400 750 (mV) 360 7
• Loss Profile mask is specified in the JESD204B standard 10 20in. FR4 channel @ 7.4Gb/s JESD204B Acceptable Loss Profile 0 2 4 6 8 10 S D D 2 1 (d B) ¼ Baud Rat e ½ Baud Rat e ¾ Baud Rat e Compliant Insert ion Loss Non-Compliant Insert ion Loss Example Compliant Channel Loss (~8" FR-4 Channel @ 6.375 Gb/ s) Example Non-Compliant Channel Loss
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