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

Test SetupTest Setup

DigitalOscilloscope

Bit ErrorTester

PatternGenerator

EvaluationBoard

A) Eye Generation

B) BERs

Rx Tx

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

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)

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

Eye DiagramsEye Diagrams

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%

Design IssuesDesign Issues

• Veering PinsVeering Pins• Power Supply ConnectivityPower Supply Connectivity• Interference during TestingInterference during Testing

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)

Any Questions??Any Questions??