82870P2P64H2 Datasheet, PDF (148/217 Pages) –

Functional Description
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4.3.2 Pin Multiplexing in Single and Dual Slot Modes
When operating in a single slot or dual-slot environment, it is required that the controller be in the
Parallel Mode of operation, thus avoiding placement of de-serialization glue. In a single slot
environment, it is not necessary to carry the logic required to electrically isolate a slot. The mode
of operation for an interface is based on sampling of the HPx_SLOT[2:0] pins on PWROK.
Table 45 lists the modes.
Table 45. Hot Plug Mode Settings
HPx_SLOT[2:0]
000
001
010
011
100
101
110
111
Hot Plug Mode
Hot Plug Disabled
1-slot (no glue)
2-slot (parallel)
3-slot (serial)
4-slot (serial)
5-slot (serial)
6-slot (serial)
Reserved
When in one of the parallel modes of operation, the hot plug controller directly controls the
isolation logic and hot plug I/Os through parallel pins instead of a serial stream. In Table 46 the
‘signal’ column refers to the name of the pin when in dual slot mode, and the ‘bus A’ and ‘bus B’
columns represent the P64H2 pins that are to be used for these modes. Note that when the
controller is operating in 1-slot mode parallel mode, the output pins for the second slot will be kept
in their reset state. These output pins are HPx_SOR#, HPx_SIC, HPx_SID, PxGNT[4:3], and
HPx_SOLR ("x" is for either bus "A" or "B").
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Intel^® 82870P2 P64H2 Datasheet