As presented at Euro DesignCon 2004 Channel Compliance Testing Utilizing Novel Statistical Eye Methodology
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1 T10/05-198r0 As presented at Euro DesignCon 2004 Channel Compliance Testing Utilizing Novel Statistical Eye Methodology Anthony Sanders Infineon Technologies Mike Resso John D Ambrosia Technologies Agilent Technologies Tyco Electronics Presented by Harvey Newman Infineon Technologies To SAS-2 2 6Gbps physical WG May 25, 2005
2 A Simple System Perspective Receiver
3 Current Methods ( f ) 20 ( e)[ a f + a f a f ] S 21 log SDD21 (db) ISI Loss > 4 db Sample Compliance Interconnect
4 The Real Problem Sdd21 (db) Frequency (GHz) Top Near-Top Near-Bottom Bottom XAUI
5 How to Measure The Channel Physical Layer Test Test System software Tyco Tyco Backplane 4-4-port Vector Network Analyzer
6 Measuring the whole Channel Term. Forward Channel Term. P1,P2 TxP,N P3,P4 RxP,N Term. Term. NEXT Term. Term. Term. Term. Term. Term. P1,P2 TxP,N FEXT P1,P2 TxP,N P3,P4 RxP,N P3,P4 RxP,N Term. Term.
7 Differential Measurements Differential Signal Common Signal Port 1 Port 2 Port 1 Port 2 S DD11 S DD12 S DC11 S DC12 S DD21 S DD22 S DC21 S DC 22 S CD11 S CD12 S CC11 S CC12 S CD21 S CD22 S CC21 S CC 22
8 Frequency Response 0-5 Return Loss Channel Return Loss Transmitter & Receiver -10 Magnitude (db) Transfer Function with return loss Example crosstalk Frequency (Hz) x 10 9
9 Analysing Channels Must include all channel effects Mode conversions Channel and device return loss Crosstalk Magnitude and phase Return Loss Influence of the pattern/coding Must include all jitter and statistical effects
10 What is the real problem? Various Coding FIR Various Coding FIR Linear equalisation Multilevel sampling Nonlinear equalisation Transmitter Channel Receiver Correlated and uncorrelated transmitters Various Channels incl. FEXT and NEXT Various jittered signalling types with common mode noise and return loss
11 Introducing Stateye Following slides introduce the basic theory of stateye based on alpha c++ code and gnuplot running under Linux I would suggest that if there are questions, ask while I am presenting. It is important to understand each step
12 Simple Transfer Function
13 Impulse Response
14 Pulse Response
15 Symbols
16 ISI
17 Worst case patterns
18 Worst Case Sampling Jitter Jitter Probability Density Function
19 Worst Case Eye Opening Jitter Probability Density Function
20 Cursor Extraction
21 Conditional pdf
22 Conditional pdf
23 Conditional pdf
24 Sampling Jitter
25 Average pdf over transmit jitter
26 Pdf -> > cdf
27 Conditional Average cdfs
28 Stateye
29 Taking more cursors
30 Taking more cursors
31 Simple Crosstalk
32 Pulse Response of Crosstalk
33 Effect of crosstalk on pdf
34 Effect of crosstalk on stateye
35 Multiple Crosstalk Aggressors
36 Multiple Crosstalk Aggressors
37 Real Probability
38 Pause for Breathe (mine)
39 A Channel Example
40 Short Channel no via
41 Short Channel no via
42 Short Channel no via
43 Short Channel with via
44 Short Channel with via
45 Short Channel with via
46 Longer Channel
47 Longer Channel
48 Longer Channel
49 Longer Channel + deemphasis
50 Longer Channel + deemphasis
51 Long Channel with close rx via
52 Long Channel with close rx via
53 Long Channel with close rx via
54 Longer Channel + DFE
55 Longer Channel + DFE
56 Dealing with Correlated Data
57 DCD or Pulse Shrinkage
58 PAM
59 Return Loss, Boosting and FIRs Transmitter n port s-parameter Channel n port s-parameter Linear Equaliser Receiver n port s-parameter Convert to T-matrix, multiply and convert back to S-matrix Calculate pulse response Push pulse response through any FIR
60 Dealing with common mode Calculate common mode transfer function Create the pulse response seen at the receiver Extract the cursors Additional use the cursors in the calculation of the conditional pdf,, as for crosstalk
61 Stateye Stateye is a non-profit, open source, developers forum under stateye.org Currently stateye is being re-developed Stateye is being rewritten currently under c++ to allow easier contribution and exploration of differing technical opinions The initial c++ class structure and initial functions will be made available at the above website.
62 Stateye Lab results concerning validation of this technique are also available from the website Stateye is under continuous development and improvement and encourages contribution This presentation is available from the T10 website. T10/05-198r0
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