This specification defines a standardized NAND Flash device interface that provides the means for a system to be designed that supports a range of NAND Flash devices without direct design pre-association. The solution also provides the means for a system to seamlessly make use of new NAND devices that may not have existed at the time that the system was designed.

1.1 Purpose This document, which all other MOST Specifications relate to, is the main specification of MOST (Media Oriented System Transport). 1.2 Scope This document contains the specification of the MOST application layer and the MOST network layer. This specification is speed grade independent. However, it is not fully backward compatible to the existing speed grades MOST25 and MOST50 as described in the MOST Specification Rev. 2.5. In some cases a differentiation between specific implementations (speed grade, physical interface) is necessary. The following terms are used to mark corresponding passages.

1. INTRODUCTION............................................................................................................... 46 1.1. A THIRD GENERATION I/O INTERCONNECT ................................................................... 46 1.2. PCI EXPRESS LINK......................................................................................................... 49 1.3. PCI EXPRESS FABRIC TOPOLOGY .................................................................................. 50 1.3.1. Root Complex........................................................................................................ 50 1.3.2. Endpoints .............................................................................................................. 51 1.3.3. Switch .................................................................................................................... 54 1.3.4. Root Complex Event Collector .............................................................................. 55 1.3.5. PCI Express to PCI/PCI-X Bridge........................................................................ 55 1.4. PCI EXPRESS FABRIC TOPOLOGY CONFIGURATION ....................................................... 55 1.5. PCI EXPRESS LAYERING OVERVIEW.............................................................................. 56 1.5.1. Transaction Layer ................................................................................................. 57 1.5.2. Data Link Layer .................................................................................................... 57 1.5.3. Physical Layer ...................................................................................................... 58 1.5.4. Layer Functions and Services............................................................................... 58 TRANSACTION LAYER SPECIFICATION ................................................................. 62 2.1. TRANSACTION LAYER OVERVIEW.................................................................................. 62 2.1.1. Address Spaces, Transaction Types, and Usage................................................... 63 2.1.2. Packet Format Overview ...................................................................................... 65 2.2. TRANSACTION LAYER PROTOCOL - PACKET DEFINITION............................................... 67 2.2.1. Common Packet Header Fields ............................................................................ 67 2.2.2. TLPs with Data Payloads - Rules ......................................................................... 70 2.2.3. TLP Digest Rules .................................................................................................. 74 2.2.4. Routing and Addressing Rules .............................................................................. 74 2.2.5. First/Last DW Byte Enables Rules........................................................................ 78 2.2.6. Transaction Descriptor ......................................................................................... 81 2.2.7. Memory, I/O, and Configuration Request Rules................................................... 87 2.2.8. Message Request Rules ......................................................................................... 94 2.2.9. Completion Rules ................................................................................................ 115 2.2.10. TLP Prefix Rules ................................................................................................. 118 2.3. HANDLING OF RECEIVED TLPS.................................................................................... 123 2.3.1. Request Handling Rules...................................................................................... 126 2.3.2. Completion Handling Rules................................................................................ 138 2.4. TRANSACTION ORDERING ............................................................................................ 142 2.4.1. Transaction Ordering Rules ............................................................................... 142 ......

2019年最新版的NGPON2 PMD层标准 G.989.2，光网络接入的核心技术标准之一，NGPON2光模块主流厂商参考的行业规范：40-Gigabit-capable passive optical networks (NG-PON2): Transmission convergence layer specification。

2021年最新版的NGPON2 TC层标准 G.989.3，光网络接入的核心技术标准之一，北美Verizon等运营商部署的参考规范。

xHCI for USB 3.0 Host controller specification

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