Packets As Transaction Building Blocks
HyperTransport control packet types — information, request, and response are used in various combinations to accomplish transactions. In many transactions, data packets are also used with the control packets to carry a data payload ranging from 0-64 valid bytes. Transactions start when the transmit interface of a device sends an information or request control packet. Any bridges or tunnels in the path between a requester and the ultimate target have responsibilities for forwarding any request, response, and data packets associated with the transfer in the proper direction. Note: This chapter highlights key packet fields used in the construction of HyperTransport transactions; refer to Chapter 4, entitled ...
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