PCI Express Base Specification v1.0 - 2002.pdf

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PCI EXPRESS BASE SPECIFICATION, REV. 1.0In the terms of how Message Requests are routed, this specification differentiates betweenthe following two routing mechanisms:• Implied Routing – without specific address/routing information contained withinMessage packet header• Destination is the other component on the Link or• Destination is the Root Complex.• Message is broadcast from the Root Complex to all downstream devices.• Explicit Routing – with specific address/routing information contained withinMessage packet header• Destination is another device within local PCI Express hierarchy or• Destination is a device within a different PCI Express hierachyNote that the explicit routing mechanism is used by the Messages that are definedfor support of advanced switching applications.PCI Express provides support for vendor-defined messages using specific reserved codesgiven in this document. The definition of specific vendor-defined messages is outside thescope of this document.2.2.4.1. Types of MessagesMessages defined within the PCI Express specification include the following types ofMessages:• System Management Message Groupo Interrupt Signalingo Error Signalingo Power Managemento Locked Transaction Supporto Payload Definedo Vendor Specific Messageso Hot Plug Signaling• Advanced Switching Support Message Groupo Data Packet Messageso Signal Packet Messages46
PCI EXPRESS BASE SPECIFICATION, REV. 1.02.2.4.2. Vendor-defined MessagesThis specification establishes a standard framework within which vendors can specify theirown Vendor-defined Messages tailored to fit the specific requirements of their platforms(see Sections 2.8.1.5 and 2.8.1.7).Note that these Vendor-defined messages are not guaranteed to be interoperable withcomponents from different vendors.2.3. Packet Format OverviewTransactions consist of Requests and Completions, which are communicated using packets.Figure 2-2 shows a high level view of a Transaction Layer Packet, consisting of a header, forsome types of packets, a data payload, and an optional TLP digest. The following sectionsof this chapter will define the detailed structure of packet headers.Byte 0 >HeaderByte J >Byte K >Byte K+4 >Data Byte 0Data(included when applicable)TLP Digest (optional)Data Byte K+3Figure 2-2: Generic Transaction Layer Packet FormatOM13756Depending on the type of a packet, the header for that packet will include some of thefollowing types of fields:• Format of the packet• Type of the packet• Length for any associated data• Transaction Descriptor, including:o Transaction IDo Attributeso Traffic Class• Address/routing information• Byte enables• Message encoding• Completion status47
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PCI Express Base Specification v1.0 - 2002.pdf

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