Feasibility Framework for 10SPE Automotive

Transcription

1 Feasibility Framework for 10SPE Automotive Paris September, 2016 Mehmet V. Tazebay, Ph.D. Broadcom Limited 2016 IEEE-SA ETHERNET & AUTOMOTIVE TECHNOLOGY DAY Page 1

2 What is 10SPE PHY? MAC xmii 10 Mbps TX 10 Mbps RX PHY MDIO PCS PMA LM CR CMC MDI Conn. Link Segment MDI Conn. CMC PHY MDIO PMA PCS CR LM xmii 10 Mbps TX 10 Mbps RX MAC PHY Control PHY Control TX specified Link segment needs to be specified 10SPE PHY will include Physical Coding Sublayer (PCS) Physical Media Attachment (PMA) PHY Control Link Monitor (LM) Clock Recovery (CR) xmii (low-pin count, low power) 10SPE PHY TX electrical interface will be specified Version IEEE-SA ETHERNET & AUTOMOTIVE TECHNOLOGY DAY Page 2

3 Economic Feasibility Framework: Sample Relative Comparison to 100BASE-T1 & 10BASE-T Baseline Components PHY PCS PMA TX RX» AFE» Digital» AFE» DSP PHY 100BASE-T1 10BASE-T 10SPE Quantity Complexity Quantity Complexity Quantity Complexity PCS PMA TX AFE Digital RX AFE MDI / Channel Magnetics MDI/Channel Connectors Cable PCB Other drivers Cable harness weight Weight Latency, Link Acquisition Time 1 1 * x% > 1 1 * y% < 0.5 EMC properties TOTAL COMPLEXITY Packaging is an important factor as well but it is strongly dependent on the implementation. Therefore, it is part of absolute cost analysis for x% and y% and not relative cost comparison as provided here. It is economically feasible to attain a 10SPE PHY with less than 50% cost of 100BASE-T1 PHY Digital & DSP Magnetics Connectors Cable PCB Version IEEE-SA ETHERNET & AUTOMOTIVE TECHNOLOGY DAY Page 3

4 MDI Connector Link Segment Properties Mated Connector Pair MDI Connector Link Segment Between two linked-up units running up to 10Mbps over Unshielded Twisted Pair(s) (UTP) with length up to 15m for passenger vehicles / 40m for commercial vehicles Consisting of: 6-connector structured UTP cabling with at least 15m of balanced copper cables including two end connectors. Mated Connector Pairs (maximum four, connectors may be part of Multi- Pin connectors) Version IEEE-SA ETHERNET & AUTOMOTIVE TECHNOLOGY DAY Page 4

5 Line Signaling Options (cntd.) PAM-3 (3B2T) [1] MLT-3 [2] DME [3] PR-IV [4] Bits Per Baud T symbol, nsec Vpk-pk, TX (next slide) DAC Levels Peak to Average Power Ratio Self-Synchronizing No No No Error Detection? No Possible Possible DC Free? No No Yes Yes Compatibility with PoDL Difficult Difficult Very Good Good Compatibility with extended reach Good Ok Difficult Good References [1] Clause 96 [2] Clause 25 [3] Clause 98 [4] Signalling Terminology: PAM-M and Partial Response Precoders Version IEEE-SA ETHERNET & AUTOMOTIVE TECHNOLOGY DAY Page 5

6 Line Signaling Options (cntd.) 3B2T + PRF MLT3 PRIV DME Broadcom Proprietary and Confidential Broadcom Corporation. Version All rights IEEE-SA reserved. ETHERNET & AUTOMOTIVE TECHNOLOGY DAY Page 6

7 Conclusions Framework to discuss feasibility has been established Overall system cost and feasibility has to be considered PHY, channel, relative cost, EMC. Economic feasibility The analysis for this presentation is done based on the channel models available from IEEE 802.3bw and (chini_buntz_10spe_01a_0916.pdf from IEEE SPE September 2016 interim meeting). As shown in sample comparison chart, it is economically feasible to build 10SPE PHYs with relative cost 50% less than 100BASE-T1. There may be further cost reductions in the channel components (e.g., magnetics). Technical Feasibility In part dependent on the channel definition. Need to agree on some basic parameters of the link segment. There exist low-pin-count, low power media independent interface options (cordaro_thaler_10spe_01a_0916.pdf from IEEE SPE September 2016 interim meeting). There exist line signaling techniques to achieve 10Mbit/s over single twisted pair channels within the given performance, cost and power constraints. Therefore, 10SPE is technically feasible. Version IEEE-SA ETHERNET & AUTOMOTIVE TECHNOLOGY DAY Page 7

8 Thank You! 2016 IEEE-SA ETHERNET & AUTOMOTIVE TECHNOLOGY DAY Page 8