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System Management Bus (SMBus) Specification2.0(系统管理总线(smbus)规范)

Clojure

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  • 开发语言:Others
  • 实例大小:0.59M
  • 下载次数:3
  • 浏览次数:110
  • 发布时间:2022-11-27
  • 实例类别:Clojure
  • 发 布 人:andyme2010
  • 文件格式:.pdf
  • 所需积分:2

实例介绍

【实例简介】System Management Bus (SMBus) Specification2.0(系统管理总线(smbus)规范)

【实例截图】

【核心代码】

System Management Bus (SMBus) Specification Version 2.0
SBS Implementers Forum 3
Table of Contents
1. INTRODUCTION...................................................................................................................5
1.1. Overview............................................................................................................................................5
1.2. Audience ............................................................................................................................................5
1.3. Scope ..................................................................................................................................................5
1.4. Organization of this document.........................................................................................................5
1.5. Supporting documents......................................................................................................................6
1.6. Definitions of terms...........................................................................................................................6
1.7. Conventions.......................................................................................................................................8
2. GENERAL CHARACTERISTICS.........................................................................................9
3. LAYER 1 – THE PHYSICAL LAYER.................................................................................11
3.1. Electrical characteristics of SMBus devices – two discrete worlds.............................................11
3.1.1. SMBus common AC specifications..........................................................................................11
3.1.2. Low-power DC specifications...................................................................................................14
3.1.3. High-Power DC specifications..................................................................................................16
3.1.4 Additional common low and high-power specifications...........................................................17
4. LAYER 2 – THE DATA LINK LAYER................................................................................18
4.1. Bit transfers.....................................................................................................................................18
4.1.1. Data validity..............................................................................................................................18
4.1.2. START and STOP conditions...................................................................................................18
4.1.3. Bus idle condition.....................................................................................................................18
4.2. Data transfers on SMBus ...............................................................................................................19
4.3. Clock generation and arbitration..................................................................................................20
4.3.1. Synchronization ........................................................................................................................20
4.3.2. Arbitration.................................................................................................................................21
4.3.3. Clock low extending.................................................................................................................22
4.4. Data transfer formats.....................................................................................................................23
5. LAYER 3 – NETWORK LAYER.........................................................................................24
5.1. Usage model.....................................................................................................................................24
5.2. Device identification – slave address.............................................................................................24
5.2.1. SMBus address types................................................................................................................25
5.3. Using a device..................................................................................................................................26
 System Management Bus (SMBus) Specification Version 2.0
SBS Implementers Forum 4
5.4. Packet error checking.....................................................................................................................26
5.4.1. Packet error checking implementation......................................................................................26
5.5. Bus Protocols...................................................................................................................................27
5.5.1. Quick command........................................................................................................................28
5.5.2. Send byte...................................................................................................................................29
5.5.3. Receive byte..............................................................................................................................29
5.5.4. Write byte/word........................................................................................................................29
5.5.5. Read byte/word.........................................................................................................................30
5.5.6. Process call ...............................................................................................................................31
5.5.7. Block write/read........................................................................................................................31
5.5.8. Block write-block read process call..........................................................................................32
5.5.9 SMBus host notify protocol......................................................................................................34
5.6. SMBus Address resolution protocol..............................................................................................34
5.6.1. Unique Device Identifier (UDID).............................................................................................34
5.6.2. Power-on reset ..........................................................................................................................38
5.6.3. ARP commands ........................................................................................................................38
APPENDIX A – OPTIONAL SMBUS SIGNALS...........................................................................54
SMBSUS#....................................................................................................................................................54
SMBALERT#..............................................................................................................................................55
APPENDIX B – DIFFERENCES BETWEEN SMBUS AND I 2 C ...................................................57
DC specifications for SMBus and I2C.......................................................................................................57
Timing specification differences between SMBus and I 2 C......................................................................58
Other differences.........................................................................................................................................58
APPENDIX C – SMBUS DEVICE ADDRESS ASSIGNMENTS...................................................59

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