PI7C8150BMA-33 datasheet(77/107 Pages) PERICOM

77 / 107 page

PI7C8150B

ASYNCHRONOUS 2-PORT PCI-TO-PCI BRIDGE

Page 77 of 107

April 2015 – Revision 2.1

14.1.5

REVISION ID REGISTER – OFFSET 08h

Bit

Function

Type

Description

7:0

Revision

R/O

Indicates revision number of device. Hardwired to 02h

14.1.6

CLASS CODE REGISTER – OFFSET 08h

Bit

Function

Type

Description

15:8

Programming

Interface

R/O

Read as 0 to indicate no programming interfaces have been defined

for PCI-to-PCI bridges

23:16

Sub-Class Code

R/O

Read as 04h to indicate device is PCI-to-PCI bridge

31:24

Base Class Code

R/O

Read as 06h to indicate device is a bridge device

14.1.7

CACHE LINE SIZE REGISTER – OFFSET 0Ch

Bit

Function

Type

Description

7:0

Cache Line Size

R/W

Designates the cache line size for the system and is used when

terminating memory write and invalidate transactions and when

prefetching memory read transactions.

Only cache line sizes (in units of 4-byte) which are a power of two

are valid (only one bit can be set in this register; only 00h, 01h, 02h,

04h, 08h, and 10h are valid values).

Reset to 0

14.1.8

PRIMARY LATENCY TIMER REGISTER – OFFSET 0Ch

Bit

Function

Type

Description

15:8

Primary Latency

timer

R/W

This register sets the value for the Master Latency Timer, which

starts counting when the master asserts FRAME_L.

Reset to 0

14.1.9

HEADER TYPE REGISTER – OFFSET 0Ch

Bit

Function

Type

Description

23:16

Header Type

R/O

Read as 01h to indicate that the register layout conforms to the

standard PCI-to-PCI bridge layout.

14.1.10

PRIMARY BUS NUMBER REGISTSER – OFFSET 18h

Bit

Function

Type

Description

7:0

Primary Bus

Number

R/W

Indicates the number of the PCI bus to which the primary interface

is connected. The value is set in software during configuration.

Reset to 0

14.1.11

SECONDARY BUS NUMBER REGISTER – OFFSET 18h

Bit

Function

Type

Description

15:8

Secondary Bus

Number

R/W

Indicates the number of the PCI bus to which the secondary

interface is connected. The value is set in software during

configuration.

Reset to 0

15-0048

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