Progress Report of Gigabit Ethernet Design
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Transcript of Progress Report of Gigabit Ethernet Design
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Progress Report of Gigabit Progress Report of Gigabit Ethernet DesignEthernet Design
ECE 4006AECE 4006A
October 18, 2001October 18, 2001
Ashley LeeAshley Lee
Shaun RosemondShaun Rosemond
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Test SetupTest Setup
DigitalOscilloscope
Bit ErrorTester
PatternGenerator
EvaluationBoard
A) Eye Generation
B) BERs
Rx Tx
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Initial Instrument SettingsInitial Instrument Settings
• Pattern Generator (Microwave Logic Pattern Generator (Microwave Logic gigaBERT-1400Tx)gigaBERT-1400Tx)– 0.5V amplitude 1GHz square wave 0.5V amplitude 1GHz square wave – 2277-1 Pattern setting-1 Pattern setting
• Tektronix TDS 694C Digital OscilloscopeTektronix TDS 694C Digital Oscilloscope– Channels 1&2 receive ports from moduleChannels 1&2 receive ports from module– Channel 3 is clock from pattern generatorChannel 3 is clock from pattern generator
• Used as trigger source for displayUsed as trigger source for display
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Bit Error RatesBit Error Rates
• Using 100m SC/SC FiberUsing 100m SC/SC Fiber
• Pattern: 2Pattern: 277-1-1– 0 errors at 100 errors at 10-11-11 (100 sec at 1GHz) (100 sec at 1GHz)
• Pattern: 2Pattern: 22323-1-1– BER=1.1*10BER=1.1*10-8-8 (at 1.2GHz) (at 1.2GHz)– BER=6.8*10BER=6.8*10-6-6 (at 1.4GHz) (at 1.4GHz)
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Eye MaskEye Mask
• IEEE standard 802.3z IEEE standard 802.3z standard eye mask standard eye mask for data transmit of for data transmit of 1000BASE-LX receiver1000BASE-LX receiver
• Defines eye that will Defines eye that will allow acceptable data allow acceptable data transfertransfer
• Function of ratio of Function of ratio of eye opening to bit eye opening to bit period normalized period normalized amplitudeamplitude
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Eye DiagramsEye Diagrams
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Validation of the EyeValidation of the Eye
• Green – Eye Mask Green – Eye Mask Inscribed in Inscribed in OpeningOpening
• Red – Ratio Red – Ratio between bit between bit period and eye period and eye opening ~ 80%opening ~ 80%
• Blue – Normalized Blue – Normalized Amplitude ~ 75% Amplitude ~ 75%
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Design IssuesDesign Issues
• Veering PinsVeering Pins• Power Supply ConnectivityPower Supply Connectivity• Interference during TestingInterference during Testing
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Future Design IssuesFuture Design Issues
• Signal Detect (Pin 4) – coaxial cable to Signal Detect (Pin 4) – coaxial cable to connect to Intel Boardconnect to Intel Board
• Prevent Breakage of Soldered Prevent Breakage of Soldered Connections on Intel BoardConnections on Intel Board
• Resistors and Capacitors on Intel BoardResistors and Capacitors on Intel Board– SD Pin (Biasing Resistors)SD Pin (Biasing Resistors)– AC Coupling Capacitors AC Coupling Capacitors – Biasing Resistors (Pins 2 and 3)Biasing Resistors (Pins 2 and 3)
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Any Questions??Any Questions??