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

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Detailed Description of LTSSM States

The subsections that follow provide a description of each of the LTSSM states. Most of the 11 LTSSM states are divided into two or more substates. SubState diagrams are used in the dicussions that follow to illustrate the substates.

Detect State

This state is the initial state at power-on time after a Fundamental Reset or after a Hot Reset command generated by the Software Layer. Entry into this state must occur within 80ms of Reset as described in “Reset Exit” on page 496. The Detect state can also be entered from the Disable, Loopback or L2 states. The Detect state is entered if the Configuration, Recovery or Polling states do not complete sucessfully. Figure 14-6 shows the Detect substate machine.

Figure ...

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