February 2003
Intermediate to advanced
592 pages
11h 47m
English
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Packetized Transfers
Transactions are constructed out of combinations of various packet types and carry the commands, address, and data associated with each transaction. Packets are organized in multiples of 4-byte blocks. If the link uses data paths that are narrower than 32 bits, successive bit-times are added to complete the packet transfer on an aligned 4-byte boundary. The primary packet types include:
Control Packets — used to manage various HT features, initiate transactions, and respond to transactions
Data packets — that carry the payload associated with a control packet (maximum payload is 64 bytes).
As illustrated in Figure 2-13, the control (CTL) signal differentiates control packets from data packets on the bus.
Figure 2-13. Distinguishing ...
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