status update - sdd21 & sdd11/22 model development · january 2005 1 status update - sdd21...

18
IEEE Vancouver Interim Meeting January 2005 1 Status Update - SDD21 & SDD11/22 Model Development John DAmbrosia, Tyco Electronics Matt Hendrick, Intel

Upload: buinhu

Post on 08-Apr-2018

219 views

Category:

Documents


1 download

TRANSCRIPT

IEEE Vancouver Interim Meeting January 2005 1

Status Update - SDD21 & SDD11/22 Model Development

John DAmbrosia, Tyco ElectronicsMatt Hendrick, Intel

IEEE Vancouver Interim Meeting January 2005 2

Acknowedgements

Rich Mellitz, IntelSteve Krooswyk, IntelMike Altmann, IntelYves Braem, Tyco ElectronicsMike Resso, AgilentJoe Abler, IBM

IEEE Vancouver Interim Meeting January 2005 3

IntroductionReference dambrosia_c1_0105

Recommended using proposed informative TP1 –TP4 SDD21 Channel Model MaskRecommended eliminating informative TP1 – TP4 SDD11 / 22 model masks

Concern regarding this recommendation expressedRecommended eliminating informative TP1 – TP4 SDD21 Group Delay Variation Mask

Reference Rx models as defined in http://ieee802.org/3/ap/public/channel_model/mellitz_m1_0105.pdf

IEEE Vancouver Interim Meeting January 2005 4

Proposed Informative Model SDD21, TP1 – TP4

Attenuation Limit

f2f1

Channel SDD21 response

HF_∆

LF_∆ RMS fit line

HF_Slope(dB/decade)

LF_∆ TBD[dB]HF_∆ TBD[dB]BS_HF_∆ TBD[dB]F1 TBD(1GHz)F2 TBD(factor*Nyquist)Eng_Limit_dB TBD(-50dB)HF_slope TBD(40 dB/decade)RMS_Fit_line > SDD21 spec line

Eng_Limit_dB

NONO

NONO

YESYESBS_HF_∆

]3^*42^*3*2)2/1(^*1[*)(10log*20 fbfbfbfbenLimitAttenuatio −++−= f = 50 MHz to 15 GHz b1 = 2.25e-5 b2 = 1.20e-10 b3 = 3.50e-20 b4 = 1.25e-30

IEEE Vancouver Interim Meeting January 2005 5

Review of Correlation Analysis• dambrosia_c1_0105

recommended eliminating TP1 – TP4 Informative masks for SDD11/22 and Group Delay Variation.

• Concern expressed to deletion of informative TP1 - TP4 SDD11 /22 mask.

IEEE Vancouver Interim Meeting January 2005 6

SDD11 / SDD22

No correlation

Tyco

Intel

IEEE Vancouver Interim Meeting January 2005 7

Effect due to 10dB packages

len_brd2 – length from connector on Rx line card to AC coupling Caplen_brd2a – length from AC coupling cap to RxUpdate from dambrosia_c1_0105.pdf10 dB packages had an impact.Reference http://ieee802.org/3/ap/public/channel_model/mellitz_m1_0105.pdf

IEEE Vancouver Interim Meeting January 2005 8

Cases #5 and #6 Frequency Characterization(dambrosia_02_0105)

IEEE Vancouver Interim Meeting January 2005 9

Frequency Characterization –Case #5 Cascaded with Rx Packaging

Rx models as defined in http://ieee802.org/3/ap/public/channel_model/mellitz_m1_0105.pdf

IEEE Vancouver Interim Meeting January 2005 10

Frequency Characterization –Case #6 Cascaded with Rx Packaging

Rx models as defined in http://ieee802.org/3/ap/public/channel_model/mellitz_m1_0105.pdf

IEEE Vancouver Interim Meeting January 2005 11

We’ve Seen This Before –A Channel the 5G Part Didn’t Go 10G

6000_Link3_Left_Channel0

Approximation via internal device diagnostics. Includes AC coupling cap and (5G optimized) device packaging effects

Channel measurements using SMA Line cards with no AC coupling Caps

Proposed Model

Reference – “PAM-4 Link Analysis, ”http://grouper.ieee.org/groups/802/3/ap/public/may04/dambrosia_01_0504.pdf”

IEEE Vancouver Interim Meeting January 2005 12

10 Gbps Pulse Response Characterization –Case #5 Cascaded with Rx Packaging

Rx models as defined in http://ieee802.org/3/ap/public/channel_model/mellitz_m1_0105.pdf

IEEE Vancouver Interim Meeting January 2005 13

10 Gbps Pulse Response Characterization –Case #6 Cascaded with Rx Packaging

Rx models as defined in http://ieee802.org/3/ap/public/channel_model/mellitz_m1_0105.pdf

IEEE Vancouver Interim Meeting January 2005 14

Per IBM - Additional Simulations for Cases #5 and #6 (dambrosia_02_0105)

22.1%20.8%33.0%32.9%4. No Packaging, No IC, No Xtalk

19.9%16.5%27.0%27.4%3. No Packaging, No IC

<0 (BER floor at E-11)<0 (BER floor at E-8)17.1%15.7%2. No Packaging

5.5%0% (BER floor at E-12)22.2%18.9%1. Original results

Case 6 FFE3/DFE5

Case 6 FFE3/DFE3

Case 5 FFE3/DFE5

Case 5 FFE3/DFE3

Simulation 1 – Original simulations, as specified in abler_01_00904.pdf

Simulation 2 – As stated in Simulation #1, except packaging removed

Simulation 3 – As stated in Simulation #2, except IC Model (ESD and load structures) replaced with perfect 50Ω terminations.

Simulation 4 – As stated in Simulation #3, except all crosstalk removed

IEEE Vancouver Interim Meeting January 2005 15

Length Analysis in Real Backplanes

0 500 1000 1500 2000 2500 3000 3500 4000

Backplane 1

Backplane 2

Backplane 3

Backplane 4

Backplane 5

Backplane 6

Backplane 7

Backplane 8

Backplane 9

Backplane 10

Backplane 11

Diff

eren

t bac

kpla

nes

Number of Differential Pairs

41-47"36-40.99"31-35.99"26-30.99"21-25.99"16-20.99"11-15.99"6-10.99"Under 6"

“The longest traces in a backplane must be distributed throughout the entire stackup. Selective use of materials on certain layers will not provide enough routing channels for these tracks. This issue grows as you move from a central switching architecture to a mesh architecture. “

Robert JardonJardon EngineeringDirector of Technology

6" to 10.99"30%

Under 6"45%

11 - 15.99"19%

16 - 20.99"6%

IEEE Vancouver Interim Meeting January 2005 16

Pulse Reponse of All Tyco Channels

Note – The two most difficult channels had the greatest peak

Let’s look at Cases #5 and #6

IEEE Vancouver Interim Meeting January 2005 17

ConclusionsParameters used in analysis based on proposed informative TP1 – TP4 SDD21 model are strong indicators of settling time.Need to review parameters in relation to efforts of Signaling AdHoc TP1 – TP4 SDD11 / 22 is meaningful, but not by itself. It works in conjunction with -

Tx Launched SignalChannel (TP1 / TP4) throughputChannel (TP1 / TP4) return lossDevice return lossPackage and IC (ESD / termination) effects

Different channels exist in a backplane environment and each results in different frequency content delivery to the receiver resulting in different reflection characteristics.

IEEE Vancouver Interim Meeting January 2005 18

RecommendationsAdopt proposed TP1/TP4 Informative SDD21 model template

Specific recommendations for each value needs to be completed upon Signal Ad Hoc analysis

Eliminate proposed TP1/TP4 Informative SDD11 / 22 mask

Leave to normative analysis with inclusion of packaging effects

Eliminate TP1/TP4 Informative Group Delay template