Datasheet, Volume 1 31
Interfaces
2.3.3 DMI Link Down
The DMI link going down is a fatal, unrecoverable error. If the DMI data link goes to
data link down, after the link was up, then the DMI link hangs the system by not
allowing the link to retrain to prevent data corruption. This link behavior is controlled
by the PCH.
Downstream transactions that had been successfully transmitted across the link prior
to the link going down may be processed as normal. No completions from downstream,
non-posted transactions are returned upstream over the DMI link after a link down
event.
2.4 Processor Graphics Controller (GT)
New Graphics Engine Architecture includes 3D compute elements, Multi-format
hardware-assisted decode/encode Pipeline, and Mid-Level Cache (MLC) for superior
high definition playback, video quality, and improved 3D performance and Media.
Display Engine in the Uncore handles delivering the pixels to the screen. GSA (Graphics
in System Agent) is the primary Channel interface for display memory accesses and
“PCI-like” traffic in and out.
Figure 2-6. Processor Graphics Controller Unit Block Diagram
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