Specification Sheet

Datasheet, Volume 1 of 2 29
Interfaces
2.3.2 DMI Error Flow
DMI can only generate SERR in response to errors; never SCI, SMI, MSI, PCI INT, or
GPE. Any DMI related SERR activity is associated with Device 0.
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.
Figure 2-4. Example for DMI Lane Reversal Connection
CNPPCH‐HPackage
CNPPCH‐HPackage
PCHDMI
L0 L1 L2 L3 L4 L5 L6 L7
L0 L1 L2 L3 L4 L5 L6 L7
PCHDMI
L7 L6 L5 L4 L3 L2 L1 L0
L0 L1 L2 L3 L4 L5 L6 L7
DMI0
CPUPackage
CPUDMI
L0 L1 L2 L3
DMI0
DMI1
DMI1
DMI2
DMI2
DMI3
DMI3
DMI4
DMI5
DMI6
DMI7
CPUPackage
CPUDMI
L0 L1 L2 L3
DMI0
DMI1
DMI2
DMI3
DMI4
DMI5
DMI6
DMI7
DMI0
DMI1
DMI2
DMI3
WithoutLaneReversal WithLaneReversal