910GL datasheet(167/426 Pages) INTEL

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Host-PCI Express* Bridge Registers (D1:F0)

(Intel® 82915G/82915P/82915PL Only)

Datasheet

167

8.1.53

VC1RCTL—VC1 Resource Control (D1:F0)

PCI Device:

Address Offset:

120h

Default Value:

01000000h

Access:

RO, R/W

Size:

32 bits

Controls the resources associated with PCI Express Virtual Channel 1.

Bit

Access &

Default

Description

R/W

VC1 Enable

0 = Virtual Channel is disabled.

1 = Virtual Channel is enabled. See exceptions in note below.

Software must use the VC Negotiation Pending bit to check whether the VC

negotiation is complete. When VC Negotiation Pending bit is cleared, a 1 read

from this VC Enable bit indicates that the VC is enabled (Flow Control

Initialization is completed for the PCI Express* port); a 0 read from this bit

indicates that the Virtual Channel is currently disabled.

Notes:

• To enable a Virtual Channel, the VC Enable bits for that Virtual Channel must

be set in both Components on a Link.

• To disable a Virtual Channel, the VC Enable bits for that Virtual Channel must

be cleared in both Components on a Link.

• Software must ensure that no traffic is using a Virtual Channel at the time it is

disabled.

• Software must fully disable a Virtual Channel in both Components on a Link

before re-enabling the Virtual Channel.

30:27

Reserved

26:24

R/W

001b

VC1 ID: Assigns a VC ID to the VC resource. Assigned value must be non-zero.

This field cannot be modified when the VC is already enabled.

23:8

Reserved

7:1

R/W

00h

TC/VC1 Map: This field indicates the TCs (Traffic Classes) that are mapped to

the VC resource. Bit locations within this field correspond to TC values. For

example, when bit 7 is set in this field, TC7 is mapped to this VC resource. When

more than one bit in this field is set, it indicates that multiple TCs are mapped to

the VC resource. In order to remove one or more TCs from the TC/VC Map of an

enabled VC, software must ensure that no new or outstanding transactions with

the TC labels are targeted at the given Link.

TC0/VC1 Map: Traffic Class 0 is always routed to VC0.

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