MIPI SLIMbus v2.0：串行低功耗音频总线技术规格

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MIPi SLIMbus specification v2.0 是一项专为低功耗应用设计的串行内部媒体总线标准，它在音频数据传输领域展现了显著的优势。该规范由MIPI Alliance（移动接口物理接口联盟）制定，旨在提供高效、低功耗的解决方案，适用于芯片间的音频通信。 SLIMbus的核心特点是其极简的设计，通过减少信号线的数量，仅需两根线路就支持所有的功能。这极大地简化了硬件设计，降低了系统的复杂性和成本。这种灵活性使得SLIMbus能够适应各种动态变化的系统需求，无论是不同的音频采样速率还是实时的控制流，都能得到有效的支持。版权信息显示，这份规范的使用受到MIPI Membership Agreement 和 MIPI Bylaws 的约束，这意味着遵循MIPI会员公司的权益和义务。随着技术的不断进步，LML Working Group（轻量级工作小组）会持续对规范进行更新和完善。值得注意的是，尽管这份文档包含有价值的专有信息，但它并非对知识产权（IPR）的授权，而是基于"as is"原则提供，即按需提供且不保证无缺陷。这意味着接收者在使用时需自行承担风险，作者和MIPI均不对文档中的内容以及可能产生的问题提供任何形式的担保，包括但不限于明示或暗示的保证，以及法定的保修责任。 MIPi SLIMbus specification v2.0 是音频行业中一个重要的技术标准，对于追求低功耗、高效率和灵活性的音频设备设计者来说，理解和遵循这一规范是至关重要的，因为它能帮助他们构建出响应快速、性能卓越的音频子系统。

Specification for SLIMbus Version 2.0

17-Aug-2015

Confidential

Table 65 LPCM Audio Number Format Comparison................................................................... 120

Table 66 Presence Rate ................................................................................................................. 121

Table 67 DATA Field Length ........................................................................................................ 121

Table 68 Channel Configuration Messages .................................................................................. 157

Table 69 Core Message Codes ..................................................................................................... 169

Table 70 NEXT_PAUSE_CLOCK Payload Value ....................................................................... 184

Table 71 Interface Device Core Message Support ....................................................................... 200

Table 72 Interface Device Core Information Element Support .................................................... 201

Table 73 Interface Device Class-specific Information Elements ................................................. 202

Table 74 Interface Device Class-Specific Value Elements ........................................................... 205

Table 75 Manager Core Message Support .................................................................................... 209

Table 76 Manager Core Information Element Support ................................................................ 210

Table 77 Manager Class-Specific Information Elements ............................................................. 210

Table 78 Framer Core Message Support ...................................................................................... 213

Table 79 Framer Core Information Element Support ................................................................... 214

Table 80 Framer Class-Specific Information Elements ................................................................ 214

Table 81 QUALITY Information Element ................................................................................... 215

Table 82 Generic Device Core Message Support ......................................................................... 219

Table 83 Generic Device Core Information Element Support ...................................................... 220

Table 84 Use Case 1 and 2 Configuration .................................................................................... 222

Table 85 Use Case 1 and 2 – Slot Layout ..................................................................................... 222

Table 86 Use Case 3 Configuration .............................................................................................. 224

Table 87 Use Case 3 – Slot Layout .............................................................................................. 225

Table 88 Use Case 4 Configuration .............................................................................................. 226

Table 89 Use Case 4 – Slot Layout .............................................................................................. 227

Table 90 Use Case 5 Configuration .............................................................................................. 228

Table 91 Use Case 5 – Slot Layout .............................................................................................. 229

Table 92 Application Processor Ports and End Points Example ................................................... 230

Table 93 Natural Frequencies for 4k Family of Flows ................................................................. 237

Table 94 Natural Frequencies for 11.025k Family of Flows ........................................................ 238

Table 95 Natural Frequencies for 12k Family of Flows ............................................................... 239

Version 2.0 Specification for SLIMbus

17-Aug-2015

Confidential

1 Introduction

Demand for multimedia functions within mobile terminals is increasing. A key driver for unit growth and 1

product differentiation is digital audio. 2

Commonly used digital audio interfaces in mobile terminals such as I

S and PCM are generally intended for 3

point-to-point connection between an application processor and a single digital audio device. Typically, these 4

interfaces only support one or two digital audio channels. As such, adding functions and digital audio 5

channels to mobile terminals beyond those for voice communication and simple stereo music applications is 6

very difficult without increasing the number of bus structures in the mobile terminal. Though scalable, just 7

adding bus structures limits design flexibility and is costly in terms of pin count, package size, and PCB 8

layout area and power consumption. 9

In addition, numerous control bus structures such as I

C, SPI, microWire™, UART and GPIOs, typically 10

reside in parallel to audio buses not only for audio device control, but handling the countless low bandwidth 11

control tasks required for lighting, haptic feedback, temperature monitoring and power sequencing. 12

SLIMbus provides the mobile terminal industry a standard, robust, scalable, low-power, high-speed, cost-13

effective bus configuration using a minimum of two wires, and optionally up to seven additional wires. 14

SLIMbus supports a wide range of digital audio and control solutions for mobile terminals. 15

SLIMbus effectively replaces many other digital audio buses such as PCM and I

S, as well as control buses 16

such as I

C, SPI, or UART, in a mobile terminal by providing flexible and dynamic assignment of bus 17

bandwidth between digital audio and non-audio control and data functions. 18

SLIMbus is not backward compatible with any current digital audio bus or digital control bus. 19

1.1 Scope

SLIMbus interface protocols and commands are within the scope of this specification. 20

Electrical specifications at the physical terminals of SLIMbus Devices, as well as a description of signal 21

timing relationships, are also within the scope of this specification. 22

Implementation details of the SLIMbus interface within an electronic device are not within the scope of this 23

document. 24

1.2 Purpose

The purpose of this document is to specify a standard interface between baseband or application processors 25

and peripheral components. 26

Implementing the SLIMbus Specification greatly increases the flexibility for mobile terminal system 27

designers to realize multiple products within a product line quickly, each with widely varying digital audio 28

and user interface features, without the addition of multiple bus structures. 29

SLIMbus reduces the time-to-market and design cost of mobile terminals by simplifying the interconnection 30

of products from different manufacturers. 31

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