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PCI Express System Architecture by MindShare, Inc, Ravi Budruk, Don Anderson, Tom Shanley

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Elements of the ACK/NAK Protocol

Figure 5-3 is a block diagram of a transmitter and a remote receiver connected via a Link. The diagram shows all of the major Data Link Layer elements associated with reliable TLP transfer from the transmitter's Transaction Layer to the receiver's Transaction Layer. Packet order is maintained by the transmitter's and receiver's Transaction Layer.

Figure 5-3. Elements of the ACK/NAK Protocol

Transmitter Elements of the ACK/NAK Protocol

Figure 5-4 on page 215 illustrates the transmitter Data Link Layer elements associated with processing of outbound TLPs and inbound ACK/NAK DLLPs.

Figure 5-4. Transmitter Elements ...

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