Example SM Sequence: Link Initialization Disconnect

This example illustrates a link initialization disconnect sequence; that is, the events that would occur when BIOS software uses disconnect (LDTSTOP#) to change the link frequency and width during initialization.

Background

During initialization, devices that share a HT link must determine the maximum clock frequency and maximum link width supported by both devices. The first step in this process involves a device procedure that establishes a safe but not necessarily optimum clock frequency and link width immediately following reset. Initialization software (BIOS) must tune the link width and frequency. Software simply reads the maximum capability registers within each device, determines the ...

Get HyperTransport™ System Architecture now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.