PCI Express 4.0规范全文下载,SSD和网卡何时能受益?

PCI Express® Base Specification Revision4.0 Version 1.0

 

下载链接  http://pan.baidu.com/s/1dFxqX9Z (也可以点击本文底部“阅读原文”)


大家可能看到新闻了,PCIe Express 4.0 v1.0规范终于正式发布,此时距离我撰写支持PCIe Gen4的《初探OpenPOWER9服务器设计:x86不再寂寞》已经过去一年的时间。不知这是否意味着POWER9将会尽快正式发布了呢?

 

有意思的是,在10年前PCIe 2.0发布的时候,我写过一篇工作站的评测,提到了对于显卡/GPU的意义,也就是全速x16插槽。

 

6年前,大约Intel发布第一代Xeon E5的半年之前,我也写过一篇评论,因为LSI已经提前推出了支持PCIe 3.0 x86Gb/s SAS控制器和HBA卡。

 

0?wx_fmt=png这次应该是9月底就完成的,整个规范共1293

 

今天,在4.0草案标准期间“偷跑”的板卡同样不少,不过x16 lane宽度的显卡/GPU似乎不是当前最紧迫的,毕竟PCIe 3.08GT/s每个lane有效带宽接近1GB/s全双工。而对于SSD和网卡就不同了。

 

56/100Gb网卡、

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 ......
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