21150-AB Intel Corporation, 21150-AB Datasheet - Page 119

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21150-AB

Manufacturer Part Number
21150-AB
Description
Communications, Transparent PCI-to-PCI Bridge
Manufacturer
Intel Corporation
Datasheet

Specifications of 21150-AB

Case
QFP
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15.1.12
15.1.13
15.1.14
Preliminary
Datasheet
Primary Bus Number Register—Offset 18h
This section describes the primary bus number register.
This register must be initialized by configuration software.
Dword address = 18h
Byte enable p_cbe_l<3:0> = xxx0b
Secondary Bus Number Register—Offset 19h
This section describes the secondary bus number register.
This register must be initialized by configuration software.
Dword address = 18h
Byte enable p_cbe_l<3:0>= xx0xb
Subordinate Bus Number Register—Offset 1Ah
This section describes the subordinate bus number register.
This register must be initialized by configuration software.
Dword address = 18h
Byte enable p_cbe_l<3:0>= x0xxb
7:0
15:8
Dword Bit
Dword Bit
Primary bus number
Secondary bus number
Name
Name
R/W
R/W
R/W
R/W
Indicates the number of the PCI bus to which
the primary interface is connected. The 21150
uses this register to decode Type 1
configuration transactions on the secondary
interface that should either be converted to
special cycle transactions on the primary
interface or passed upstream unaltered.
Reset value: 0.
Indicates the number of the PCI bus to which
the secondary interface is connected. The
21150 uses this register to determine when to
respond to and forward Type 1 configuration
transactions on the primary interface, and to
determine when to convert them to Type 0 or
special cycle transactions on the secondary
interface.
Reset value: 0.
Description
Description
21150
111

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