82NM10 Datasheet, PDF (278/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Chipset Configuration Registers
10.1.30 RPC—Root Port Configuration Register
Offset Address: 0224–0227h
Attribute:
Default Value: 0000000yh (y = 00xxb) Size:
R/W, RO
32-bit
Bit
Description
31:8
7
6:4
3:2
1:0
Reserved
High Priority Port Enable (HPE) — R/W.
0 = The high priority path is not enabled.
1 = The port selected by the HPP field in this register is enabled for high priority. It
will be arbitrated above all other VC0 (including integrated VC0) devices.
High Priority Port (HPP) — R/W. This field controls which port is enabled for high
priority when the HPE bit in this register is set.
111 = Reserved
110 = Reserved
101 = Reserved
100 = Reserved
100 = Port 4
010 = Port 3
001 = Port 2
000 = Port 1
Reserved
Port Configuration (PC) — RO. This field controls how the PCI bridges are
organized in various modes of operation. For the following mappings, if a port is not
shown, it is considered a x1 port with no connection.
These bits represent the strap values of ACZ_SDOUT (bit 1) and ACZ_SYNC (bit 0)
when TP3 is not pulled low at the rising edge of PWROK.
11 = 1 x4, Port 1 (x4)
10 = Reserved
01 = Reserved
00 = 4 x1s, Port 1 (x1), Port 2 (x1), Port 3 (x1), Port 4 (x1)
These bits live in the resume well and are only reset by RSMRST#.
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Datasheet