SFF-8636规范：4 Lane模块管理接口

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"SFF-8636 Management Interface for Cabled Environments 是一份由SFF委员会发布的规范，旨在定义4通道可插拔收发器模块、直连模块和屏蔽电缆组件的通用管理接口。该文档不涉及物理层和连接器接口的机械细节，而是提供了一个供系统制造商、系统集成商和供应商参考的标准。此规格是SFF委员会内部的工作规范，目前公开接受读者的评论和建议，以用于未来版本的改进。这份规范由SFF委员会的成员公司支持，并有特定的联系方式以获取更多支持。" 本文档的主要内容是关于SFF-8636规范的第二版，更新于2016年1月26日。这个规范主要关注的是在有线环境中的管理接口，特别是在4条数据通道上的设备，例如SFP（小型可插拔）和QSFP（四通道小型可插拔）模块。这些模块通常用于数据中心和网络基础设施，提供高速数据传输和连接。 SFF-8636规定了如何在这些模块和直接连接模块之间建立和管理通信，确保它们能够无缝地协同工作。虽然它不涵盖物理层的具体实现，如电气特性或物理连接器的设计，但这些模块的管理接口设计对于确保系统的互操作性和兼容性至关重要。管理接口允许系统监控和配置这些模块，包括但不限于温度、电压、数据速率、错误率等关键性能指标。对于系统制造商和集成商来说，SFF-8636提供了一个标准化的框架，以便于设计和实施支持这些模块的系统。供应商可以根据此规范开发符合标准的产品，确保它们能在广泛的网络设备中通用。同时，通过公开接收和考虑读者的反馈，SFF委员会可以不断改进规范，以适应技术的发展和市场需求。在实际应用中，SFF-8636的实施有助于简化网络架构的管理和维护，降低故障排查的复杂性，并提高整体系统的可靠性和效率。对于那些依赖于高性能网络连接的企业和组织，了解并遵循这样的标准是非常重要的。最后，文档中提到的支持由SFF委员会的成员公司提供，这表明业界的领先企业参与了该规范的制定和维护，确保了其专业性和权威性。如果需要进一步的信息或者技术支持，可以通过文档中提供的联系点与委员会成员取得联系。

Published SFF-8636 Rev 2.7

Management Interface for Cabled Environments Page 10

6.2.4

Free Side Device Monitors .......................................... 32

6.2.5 Channel Monitors ................................................... 32

6.2.6 Control Functions .................................................. 34

6.2.7 Rate Select ........................................................ 36

6.2.7.1 No Rate Selection Support......................................... 36

6.2.7.2 Extended Rate Selection........................................... 36

6.2.7.3 Rate Selection Using Application Select Tables .................... 36

6.2.8 Free Side Device Indicators and Channel Masks....................... 37

6.2.9 Free Side Device Properties ........................................ 39

6.2.10 Password Entry and Change .......................................... 40

6.2.11 Page Select ........................................................ 41

6.3 Upper Memory Map Page 00h ................................................ 41

6.3.1 Identifier ......................................................... 43

6.3.2 Extended Identifier ................................................ 43

6.3.3 Connector Type ..................................................... 43

6.3.4 Specification Compliance ........................................... 44

6.3.5 Encoding ........................................................... 45

6.3.6 Nominal Bit Rate ................................................... 45

6.3.7 Extended Rate Select Compliance .................................... 45

6.3.8 Length (Standard SM Fiber) -km ..................................... 45

6.3.9 Length (OM3) ....................................................... 46

6.3.10 Length (OM2) ....................................................... 46

6.3.11 Length (OM1) ....................................................... 46

6.3.12 Length: Cable Assembly (passive or active) or Optical Fiber (OM4)... 46

6.3.13 Device Technology .................................................. 46

6.3.14 Vendor Name ........................................................ 47

6.3.15 Extended Module Codes .............................................. 47

6.3.16 Vendor Organizationally Unique Identifier Field..................... 48

6.3.17 Vendor Part Number ................................................. 48

6.3.18 Vendor Revision Number ............................................. 48

6.3.19 Wavelength or Copper Cable Attenuation.............................. 48

6.3.20 Wavelength Tolerance ............................................... 48

6.3.21 Maximum Case Temperature ........................................... 49

6.3.22 CC_BASE ............................................................ 49

6.3.23 Extended Specification Compliance Codes............................. 49

6.3.24 Options ............................................................ 49

6.3.25 Vendor Serial Number ............................................... 50

6.3.26 Date Code .......................................................... 51

6.3.27 Diagnostic Monitoring Type ......................................... 51

6.3.28 Enhanced Options ................................................... 51

6.3.29 Check Code Extension ............................................... 52

6.3.30 Vendor Specific .................................................... 52

6.4 Upper Page 01h ........................................................... 53

6.5 Upper Page 02h ........................................................... 53

6.6 Upper Page 03h ........................................................... 53

6.6.1 Free Side Device and Channel Thresholds............................. 53

6.6.2 Optional Channel Controls .......................................... 55

6.6.3 Channel Monitor Masks .............................................. 58

FIGURES

Figure 1-1 Hierarchy of Interface Specifications (Example) 12

Figure 4-1 Common Management Interface Block Diagram 15

Figure 4-2 Direct Attach Cable Assembly Implementation 16

Figure 4-3 Separable Cable Assembly Implementation 16

Figure 4-4 Management Interface Scope 17

Figure 5-1 Write Byte Operation 19

Figure 5-2 Sequential Write Operation 20

Figure 5-3 Current Address Read 21

Figure 5-4 Random Read 21

Figure 5-5 Sequential Address Read Starting at Current Address 22

Published SFF-8636 Rev 2.7

Management Interface for Cabled Environments Page 11

Figure 5-6 Sequential Address Read Starting with Random Read 22

Figure 5-7 Timing Diagram 23

Figure 6-1 Common Memory Map 25

TABLES

Table 5-1 Management Interface timing parameters 23

Table 5-2 Non-Volatile Memory Specification 23

Table 5-3 Writable Memory Blocks 24

Table 6-1 Lower Page 00h Memory Map 26

Table 6-2 Status Indicators (Page 00h Bytes 1-2) 27

Table 6-3 Revision Compliance (Page 00h Byte 1) 27

Table 6-4 Channel Status Interrupt Flags (Page 00h Bytes 3-5) 28

Table 6-5 Free Side Monitor Interrupt Flags (Page 00h Bytes 6-8) 29

Table 6-6 Channel Monitor Interrupt Flags (Page 00h Bytes 9-21) 30

Table 6-7 Free Side Monitoring Values (Page 00h Bytes 22-33) 32

Table 6-8 Channel Monitoring Values (Page 00h Bytes 34-81) 33

Table 6-9 Control Function Bytes (Page 00h Bytes 86-99) 34

Table 6-10 xN_Rate_Select with Extended Rate Selection 36

Table 6-11 Application Select (Page 00h Bytes 89-92 and Bytes 94-97) 37

Table 6-12 Control Mode Definition 37

Table 6-13 Hardware Interrupt Pin Masking Bits (Page 00h Bytes 100-106) 37

Table 6-14 Free Side Device Properties (Page 00h Bytes 108-113) 40

Table 6-15 Upper Page 00h Memory Map 41

Table 6-16 Extended Identifier Values (Page 00h Byte 129) 43

Table 6-17 Specification Compliance Codes (Page 00h Bytes 131-138) 44

Table 6-18 Extended Rate Select Compliance Tag Assignment (Page 00h Byte 141) 45

Table 6-19 Device Technology (Page 00h Byte 147) 47

Table 6-20 Transmitter Technology (Page 00h Byte 147 Bits 7-4) 47

Table 6-21 Extended Module Code Values (Page 00h Byte 164) 47

Table 6-22 Option Values (Page 00h Bytes 193-195) 50

Table 6-23 Date Codes (Page 00h Bytes 212-219) 51

Table 6-24 Diagnostic Monitoring Type (Page 00h Byte 220) 51

Table 6-25 Enhanced Options (Page 00h Byte 221) 52

Table 6-26 Extended Bit Rate: Nominal (Page 00h Byte 222) 52

Table 6-27 Upper Page 01h Application Select Table 53

Table 6-28 Application Code Structure 53

Table 6-29 Upper Page 03h Memory Map 53

Table 6-30 Free Side Device and Channel Thresholds (Page 03h Bytes 128-223) 54

Table 6-31 Optional Equalizer, Emphasis and Amplitude Support (Page 03h Bytes 224-

225) 55

Table 6-32 Optional Channel Controls (Page 03h Bytes 226-241) 55

Table 6-33 Output Differential Amplitude Control (Page 03h Bytes 238-239) 57

Table 6-34 Input Equalization (Page 03h Bytes 234-235) 57

Table 6-35 Output emphasis Control (Page 03h Bytes 236-237) 58

Table 6-36 Channel Monitor Masks (Page 03h Bytes 242-251) 58

Published SFF-8636 Rev 2.7

Management Interface for Cabled Environments Page 12

SFF Committee --

Management Interface for Cabled Environments

1 Scope

During the early development of SFF-8636, it was made clear by firmware engineers

that a single interface was required for all enterprise-managed cables. It is

expected, therefore, that future high speed interfaces will adopt this management

interface specification which currently defines a common memory map and protocol

that can be used to manage 4-channel pluggable transceiver modules, direct attach

modules and shielded cable assemblies.

Physical layer and mechanical details of the interface are outside the scope of

this document. Memory map details and communication protocol used to transfer the

information are described within this document. This approach facilitates a common

memory map and management interface for applications with different mechanical,

physical layer and otherwise different implementations. For example, SFF-8449

defines a 4-channel solution which documents the management interface physical

layer, references SFF-8636 to ensure compatibility with the common memory map and

protocol.

This specification does not apply to the CFP MSA family of modules, which use the

MDIO interface and a different memory map.

SFF‐8636

Common Memory Map, Protocol and Timing

SFF‐8449 or SFF‐8665

Mechanical Implementation and Physical Layer

(SFF‐8449 or SFF‐8665 Provide a Complete

Interface Specification by Referencing SFF‐

8636)

FIGURE 1-1 HIERARCHY OF INTERFACE SPECIFICATIONS (EXAMPLE)

2 References

The SFF Committee activities support the requirements of the storage industry, and

it is involved with several standards.

2.1 Industry Documents

The following interface standards and specifications are relevant to this

Specification.

- SFF-8024 SFF Committee Cross Reference to Industry Products

- INF-8074 SFP (Small Formfactor Pluggable) 1 Gb/s Transceiver

- SFF-8079 SFP Rate and Application Selection

- SFF-8431 SFP+ 10 Gb/s and Low Speed Electrical Interface

- SFF-8449 Shielded Cables Management Interface for SAS

- SFF-8472 Diagnostic Monitoring Interface for Optical Transceivers

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