September 2003
Intermediate to advanced
1120 pages
23h 44m
English
Content preview from PCI Express System Architecture
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Link Training and Status State Machine (LTSSM)
General
Figure 14-5 on page 510 illustrates the top-level states of the Link Training and Status State Machine (LTSSM). Each state consists of substates that, taken together, comprise that state. The first LTSSM state entered after exiting Fundamental Reset (Cold or Warm Reset) or Hot Reset is the Detect state.
Figure 14-5. Link Training and Status State Machine (LTSSM)
The LTSSM consists of 11 top-level states: Detect, Polling, Configuration, Recovery, L0, L0s, L1, L2, Hot Reset, Loopback, and Disable. These states can be grouped into five categories:
The Link Training states.
A Link Re-Training State. ...
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