1、(LIA E The Engineering Society For Advancing Mobility Land Sea Air and Space Linear Token Passing Multiplex Dafa Bus A S40 74.1 High Speed Ring Bus (HSRB) SAE also publishes a standard on a High Speed Ring Bus (HSRB). high speed ring bus standard (HSRB) is a fault tolerant, real time high speed data
2、 communication standard based on a ring topology and the use of a Token passing access method with distributed control. requirements for the HSRB standard have been driven predominantly, but not exclusively, by military applications. Particular attention has been given to the need for low message la
3、tency, deterministic message priority and comprehensive reconfiguration capabilities. This document contains a definition of the semantics and protocol including delimiters, tokens, message priority, addressing, error detection and recovery schemes; and is written to be independent of bit rate and m
4、edia. Parameters related to particular media and bit rates are defined in the Appendix. This The Ttre Engineehg Society AEROSPACE Ih * =For Advancing Mobility Land sea Air and space STANDARD 400 COMMONWEALTH DRIVE. WARRENDALE. PA 15096 Submitted for recognition as an American National Standard LINEA
5、R TOKEN PASSING MULTIPLEX DATA BUS CONTENTS Page No. ACRONYMS AND ABBREVIATIONS . 12 1. SCOPE 12 2. REFERENCES 12 . 2.1 Applicable Documents 12 3. GENERAL REQUIREMENTS . 13 3.1 General Description . 13 3.2 Media Interface Unit (MIU) 16 3.2.1 Symbol Set 16 3.2.1.1 Line States 16 3.2.1.2 Control Symbo
6、ls 16 3.2.1.3 Data Symbols . 17 3.2.1.4 Violation Symbols 17 3.2.2 Transmitter, Receiver and Media Definition 18 3.2.2.1 Fiber Optic Bus Media Definition . 18 3.2.2.1.1 Fiber Optic Media Common Characteristics 18 SAE Technical Board Rules provide that: “This report is published by SAE to advance the
7、 state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.“ SAE reviews each technical report at least every fiv
8、e years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Printed in U.S.A. Copyright All rights reserved. 1988 Society of Automotive Engineers, Inc. AS4074.1 3.2.2.1.1.1 Fiber Optic Media Station Ports 18 Media Data Rate . 18 Media Signali
9、ng Rate . 18 Intertransmission Gap 18 Preamble Size 19 Media Wavelength and Spectral Bandwidth 19 Input/Output 3.2.2.1.1.2 Fiber Optic 3.2.2.1.1.3 Fiber Optic 3.2.2.1.1.4 System Minimum 3.2.2.1.1.5 System Minimum 3.2.2.1.1.6 Fiber Optic sM Page 2 3.2.2.1.2 Fiber Optic Transmitter (FOTX) Characterist
10、ics 19 3.2.2.1.2.1 FOTX Output Power 19 3.2.2.1.2.2 FOTX Maximum Residual Power . 19 3.2.2.1.2.3 FOTX Maximum Leakage Power 19 3.2.2.1.2.4 FOTX Output Waveform . 19 3.2.2.1.2.5 FOTX Data Streaming 19 Timeout 3.2.2.1.3 Fiber Optic Receiver (FORXI Characteristics 21 3.2.2.1.3.1 FORX 3.2.2.1.3.2 FORX O
11、perating 3.2.2.1.3.3 FORX Bit Error 3.2.2.1.3.4 FORX Input Sensi tivi ty 21 Range and Margin . 21 Rate 21 Waveform . 21 . 3.2.2.1.4 Fiber Optic Transmission Media Characteristics 21 . Page 3 *E 3.2.2.1.4.1 Fi ber Physical 3.2.2.1.4.2 Fiber Numerical 3.2.2.1.4.3 Fiber Chromatic Characteristics 24 Ape
12、rture . 24 and Modal Di sper s i on . 24 Transmission Medi a Attenuation 24 3.2.2.1.4.4 Fiber Optic AS4074.1 3.2.2.2 Electrical Bus Media Interface Definition 24 . 3.2.2.2.1 Electrical Media Common Characteristics 24 . 3.2.2.2.1.1 Electrical Media Station Input/Output Ports 24 3.2.2.2.1.2 Electrical
13、 Media Data Rate . 24 3.2.2.2.1.3 Electrical Medi a Signal i ng Rate . 24 3.2.2.2.1.4 System Minimum Intertransmission Gap 25 3.2.2.2.1.5 System Minimum Preamble Size 25 3.2.2.2.1.6 Electrical Media Surge Voltage 25 3.2.2.2.2 Electrical Transmitter (ELTX) Characteristics 25 3.2.2.2.2.1 ELTX Output 3
14、.2.2.2.2.2 ELTX Peak Voltage Level 25 Resi dual Output Voltaqe Level 25 3.2.2.2.2.3 ELTX Output . Waveform 25 3.2.2.2.2.4 ELTX Data Streaming Timeout 25 I AS4074.1 *= Page 4 Paae No. 3.2.2.2.3 Electrical Receiver (ELRX) . 27 Characteristics 3.2.2.2.3.1 ELRX Sensitivity and Waveform Compati bi 1 i ty
15、 27 3.2.2.2.3.2 ELRX Dynamic Range 27 3.2.2.2.3.3 ELRX Common Mode Rejection Ratio 28 3.2.2.2.3.4 ELRX Input Impedance 28 3.2.2.2.3.5 ELRX Bit Error Rate 28 . 3.2.2.2.4 Electrical Media . Characteristics 28 3.2.2.2.4.1 Electrical Media 3.2.2.2.4.2 Electrical Media 3.2.2.2.4.3 Electrical Media 3.2.2.
16、2.4.4 Electrical Media 3.2.2.2.4.5 Electrical Media Return Loss 29 Frequency 29 Response . Attenuation 29 Group Propagation Delay 29 Jitter 29 . 3.2.3 Media Redundancy 29 . 3.2.4 Transmission Monitoring 30 3.3 Media Access Protocol Facilities 30 3.3.1 Protocol Data Units (PDU) 30 32 32 . . 3.3.1.1 S
17、tart Delimiter (SD) 3.3.1.2 Frame Control (FC) . . 3.3.1.2.1 Frame Type (FT) 32 3.3.1.2.3 Station Management Code . 3.3.1.2.2 Priority (Px) 33 (SMC) 33 . I 3.3.1.3 Source Address (SA) 33 . 3.3.1.4 Destination Address (DA) 33 33 3.3.1.5 Word Count (WC) AS4074.1 I Paae No . 34 3.3.1.6 Information (INF
18、O) . 3.3.1.7 Message Frame Check Sequence (MFCS) 34 3.3.1.8 Token Frame Check Sequence (TFCS) 34 3.3.1.9 End Delimiter (ED) . 34 3.3.2 Timers 34 3.3.2.1 Token Holding Timer 3.3.2.2 Token Rotation Timer . 3.3.2.3 Ring Admittance Timer 3.3.2.4 Token Passing Timer 3.3.2.5 Bus Activity Timer . 36 36 37
19、37 38 3.3.3 Traffic Summary . 38 40 3.4 Station Management 3.4.1 Mode Control Command/Status Report 40 3.4.1.1 Mode Control Command . 40 3.4.1.1.1 3.4.1.1.2 3.4.1.1.3 3.4.1.1.4 3.4.1.1.5 3.4.1.1.6 3.4.1.1.7 3.4.1.1.8 3.4.1.1.9 3.4.1.1.10 3.4.1.1.11 Reset . Disable . Enable Report Status . Report Tra
20、ffic Reserved Reserved Execute BIT . Enable Time Master Mode . Disable Time Master Mode Report Time . 42 42 42 42 42 42 42 42 42 42 42 3.4.1.2 BIU Status Report 44 3.4.2 Load/Report Configuration Command and Configuration Report 45 3.4.3 Test Messages . 45 3.4.4 Wrap-Around Message Echo .45 3.4.5 BI
21、U Initialization 45 3.4.6 Built-In-Test Functions . 51 3.4.6.1 Internal Diagnostic 3.4.6.2 External Interface Loopback Test . 3.4.6.3 HOSTIBIU Message Loopback 3.4.6.4 Background Diagnostic 51 51 52 52 AS4074.1 *= Page 6 Paue No. 3.4.7 Time Synchronization Report . 52 3.4.7.2 Clock Value Latency 53
22、3.4.7.3 Message Period . 54 3.4.7.4 System Application . 54 3.4.7.1 BIU Time Clock Operation . 52 4. QUALITY ASSURANCE 54 4.1 General . 55 I 4.1.1 Responsibility for Verification . 55 4.1.2 Failure Criteria 55 4.1.3 Verification Cross Reference Index 55 4.2 Quality Conformance Verification Methods 5
23、5 4.2.1 Inspection Verification Method 55 4.2.2 Review of Analytical Data . 55 4.2.3 Demonstration Verification Method . 55 4.2.3.1 Laboratory Demonstration . 55 4.2.4 Test Verification Method 56 4.2.4.1 Laboratory Test 56 4.2.4.2 Test Categories 56 4.2.4.2.1 Engineering Test and 4.2.4.2.2 Prelimina
24、ry Qualification - 4.2.4.2.3 Formal Qualification - Evaluation 56 Scan of Performance . 56 Full Performance 56 4.2.4.2.3.1 Environmental Qualification 57 4.2.4.2.4 Reliability and Mai ntai nabi 1 i ty Analysi s and Test . 57 4.2.4.2.4.1 Built-In-Test 57 on Prime Item . 57 4.2.4.2.5 Operational Test
25、- Installed I 4.2.4.2.6 Acceptance Test - Production 57 Page 7 AS4074.1 Paae No . 5 . TPIU STATE MACHINE DEFINITION 60 5.1 Idle State (SO) 63 . 5.2 Claim Token State (S1) 64 5.3 Check Token Address State (S2) 65 5.4 Send Message State (S3) 66 5.5 Pass Token State (54) 67 . . 5.6 Check Token Pass Sta
26、te (S5) 67 . 5.7 Check Message Address State (56) 68 5.8 Receive Message State (S7) 68 6 . LIST OF FIGURES Fig . 3.1-1 Fig . 3.2.2.1.2.4-1 Fig . 3.2.2.1.3.2-1 Fig . 3.1-2 Fig . 3.2.1.2-1 Fig . 3.2.2.1.3.4-1 Fig . 3.2.2.2.2.3-1 Fig . 3.2.2.2.3.1-2 Fig . 3.2.2.2.3.3-1 Fig . 3.3.1-1 Fig . 3.3.1-2 Fig .
27、 3.3.2-1 Fig . 3.4.1 . 1-1 Fig . 3.4.1.1.4-1 Fig . 3.4.2-1 Fig . 3.4.3-1 Fig . 3.4.7.1-1 Fig . 3.4.4-1 Fig . 5-1 Linear Token Passing Bus Block Diagram Logical Ring Superimposed on a Linear Bus . Overall Frame Structure . Fiber Optic Transmitter Output Waveform . Transmitter/Receiver Optical Power L
28、evels . Fiber Optic Receiver Input Waveform . Electrical Transmitter Output Waveform Electrical Receiver Test Configuration . Minimum Input Level Electrical Receiver Test Configuration . Noise Rejection . Token Passing Protocol Frame Formats Frame Control Field Definitions . Send Message State Flowc
29、hart Mode Control Command Format . BIU Status Report Format Load/Report Configuration Command and Report Format Test Message Format . Wrap-Around Message Echo Format . Time Synchronization Message Format TPIU State Diagram . 13 14 16 20 22 23 26 27 28 31 32 35 41 43 46 49 50 53 61 7 . LIST OF TABLES
30、 Table 3.3.2.5-1 Prime Numbers for BAT Period Determination 39 Table 4-1 Acceptance Test Requirements 58 Table 5-1 State Transition Table 62 8 . APPENDIX A 69 Transmission Media Slash Sheets Fig . A-1 Manchester II Symbol Set 76 . . . SE Page 8 I AS4074.1 a Ama x Ami n Ar AF b BP s BAT BF BFC BIT BI
31、U BL BF BW C CAF CM CMLR CMLT CMW CMWLR CMWLT CR CRC CT9 CTn CT C/ B dB dBm Dc 1 ad Dcm Dcore DE DgP D. Di exP ED ELRX ELTX E/T ACRONYMS AND ABBREVIATIONS Ring Admittance Factor Maxi mum end-to-end attenuation Minimum end-to-end attenuation Attenuation of reflected signals Ring Admittance Timeout Fa
32、ctor Bus Length Factor (variable) Bits per second Bus Activity Timer BIU Fault BIU Fault Code Bui 1 t-In-Test Bus Interface Unit Bus Loopback Bus Length Factor (field used in Station Management Message to program Spectral Bandwidth the value for “b“) Clear Message Filter Table Cumulative Aborted Fra
33、mes Cumulative Messages Cumulative Messages, Local Receive Cumulative Messages, Local Transmit Cumulative Message Words Cumulative Message Words, Local Receive Cumulative Message Words, Local Transmit Configuration Report Command Cyclic Redundancy Check Claim Token Granule Size Cumul at i ve Total I
34、n“ Cumulative Tokens Center of Bit Deci bel Decibel referenced to 1 milliwatt Fiber Optic cladding diameter Maximum total dispersion Fiber Optic core diameter DisableIEnable Status Group propagation delay difference Jitter Destination Address field (may contain physical or logical address data expon
35、ential value (raised to the power) End Delimiter Electrical Receiver Electrical Transmitter End of Transmission depending on frame type) Page 9 AS4074.1 I F FC FORX FOTX FT FWn GCD h HEX HF IF INFO IR KHz L Len LTPB m M MBaud MBPS MCS MFCS MFP MHz MIU MNS MPDU MUR Nc t Nctw NA NS PX P Px P DU PF 1 P
36、F2 PF3 PN ACRONYMS AND ABBREVIATIONS (Continued) Frequency Frame Control Fiber Optic Receiver Fi ber Optic Transmi tter Frame Type Fi 1 ter Page Word “n“ Global Clock Differential Token Holding Factor Hexadecimal Token Holding Timer Factor (field definition for programming “h“ in Station Management
37、Message) Interface Fault Information Field Interface Reset Ki lohertz Load Bus Length Linear Token Passing Bus Bit position in FW field Optical Margin Megabaud Mega Bits per Second Mode Control Subcommand Code Message Frame Check Sequence Message Filter Page Megahertz Media Interface Unit Maximum Nu
38、mber of Stations in logical ring Message Protocol Data Unit Time Synchronization Message Update Periodic Rate Number of words in Claim Token Frame Claim Token Sequence Wait Time Numerical Aperture Next Station Token Rotation Factor Preamble Priority TPIU Protocol Data Unit Token Rotation Timer Facto
39、r - Priority Level 1 Token Rotation Timer Factor - Priority Level 2 Token Rotation Timer Factor - Priority Level 3 Prime Number - Bus Activity Timer Mu1 tip1 ler se, Page 10 I AS4074.1 r Rber Rd r Rdpw R f Ri dr Riz Rn v Ror ROU s RPm RPo Rr RS Rtm Rto Rvm Rvo RX RAT RC RMS RX E sd :dmr si tg SP SV
40、so s1 S2 s3 s4 s5 S6 s7 SA SD SIB SIT SMC ACRONYMS AND ABBREVIATIONS (Continued) Data Rate Factor (variable utilized in computations; normalized to Receiver Bit Error Rate Receiver Common Mode Rejection Ratio Data Rate (MBPS) Receiver Dynami c Range Receiver Input Maximum Pulse Width Distortion Fall
41、 Time (90% to 10%) Receiver Intertransmission Dynamic Range Receiver Input Impedance Receiver Noise Voltage Input Receiver Operating Range Receiver Combined OverlUndershoot Receiver Minimum Optical Power Input Receiver Maximum Optical Power Input Rise Time (10% to 90%) Signaling Rate Start-of-Bit to
42、 Center-of-Bit Start-of-Bit to Start-of-Bit Receiver Minimum Input Voltage Receiver Maximum Input Voltage Recei ver Ring Admittance Timer Remote Command Root Mean Square Receiver Enable 50 MBPS) Surge Vol tage Duration System Minimum Intertransmission Gap Preamble Minimum Size Surge Vol tage Idle St
43、ate Claim Token State Check Token Address State Send Message State Pass Token State Check Token Pass State Check Message Address State Receive Message State Source Address Start Delimiter Start-of-Bi t Start-of-Transmission Station Management Code Page 11 ma -c3 Tba Td Tdpw Td s T f Ti fgm Ti z Tm T
44、ms TO Tous TPd TP 1 TPO TPr Tr Ts r Ttm T to TFCS TSM TtP TU Tvo Tv r TX TBD THT TIME TM TPIU TRT TS TXE V w1 w2 wc TRT, ACRONYMS AND ABBREVIATIONS (Continued) Bus Activity Indication Time Clock Uncompensated Drift Rate Transmitter Maximum Pulse Width Distortion Data Streaming Timer Transmitter Maxi
45、mum Fall Time (90% to 10%) Interframe Gap Time Transmitter Drive Impedance Minimum Duration between Transitions Master and Most Distant slave Station (Global Timer) Nominal Bit Time Transmitter Combined Over/Undershoot Propagation Delay Time Transmitter Optical Leakage Power Transmitter Optical Powe
46、r Transmi tter Res i due Power Transmitter Rise Time (10% to 90%) Station Response Time Start-of-Bi t to Center-of-Bi t Start-of-Bit to Start-of-Bit Token Frame Check Sequence Ti me Synchroni zat i on Mes sage Token Passing Time Value Time Master Update Rate (milliseconds) Transmitter Output Voltage
47、 Level Transmitter Peak Output Voltage Transmi tter To Be Determined Token Holding Timer Global Clock Value (48 bits) Time Master Token Passing Interface Unit Token Rotation Timer Token Rotation Timer (for priority level “x“) This Station Transmitter Enable Valid Time Optical Wavelength Lower Optica
48、l Wavelength Upper Word Count I AS4074.1 Page 12 EIC -0J 1. SCOPE: This standard specifies the characteristics of the SAE Linear Token Passing Bus (LTPB) Interface Unit. The LTPB provides a high reliability, high bandwidth, low latency serial interconnection network suitable for utilization in real
49、time military and commercial applications. Multiple redundant data paths can be implemented to enhance reliability and survivability in those applications that require these attributes. The Token passing and data exchange protocols are optimized to provide low latency and fast failure detection and correction. Physical configurations with bus lengths up to 1000 meters can be accommodated. This specification defines the following: a. General Description (See 3.1): An overview of the LTPB protocol. b. Physical Media Interface (See 3.2): the physical interface to both optical and ele
