PI7C8152AMA datasheet(73/90 Pages) PERICOM

73 / 90 page

PI7C8152A & PI7C8152B

2-PORT PCI-TO-PCI BRIDGE

ADVANCE INFORMATION

Page 73 of 90

October 16, 2003 – Revision 1.11

12.1.17

MEMORY BASE ADDRESS REGISTER – OFFSET 20h

Bit

Function

Type

Description

3:0

Reserved

R/O

Lower four bits of register are read only and return 0.

Reset to 0

15:4

Memory Base

Address [15:4]

R/W

Defines the bottom address of an address range for the bridge to

determine when to forward memory transactions from one interface

to the other. The upper 12 bits correspond to address bits [31:20]

and are writable. The lower 20 bits corresponding to address bits

[19:0] are assumed to be 0.

Reset to 0

12.1.18

MEMORY LIMIT ADDRESS REGISTER – OFFSET 20h

Bit

Function

Type

Description

19:16

Reserved

R/O

Lower four bits of register are read only and return 0.

Reset to 0

31:20

Memory Limit

Address [31:20]

R/W

Defines the top address of an address range for the bridge to

determine when to forward memory transactions from one interface

to the other. The upper 12 bits correspond to address bits [31:20]

and are writable. The lower 20 bits corresponding to address bits

[19:0] are assumed to be FFFFFh.

12.1.19

PEFETCHABLE MEMORY BASE ADDRESS REGISTER – OFFSET

24h

Bit

Function

Type

Description

3:0

64-bit addressing

R/O

Indicates 64-bit addressing

0000: 32-bit addressing

0001: 64-bit addressing

Reset to 1

15:4

Prefetchable

Memory Base

Address [31:20]

R/W

Defines the bottom address of an address range for the bridge to

determine when to forward memory read and write transactions from

one interface to the other. The upper 12 bits correspond to address

bits [31:20] and are writable. The lower 20 bits are assumed to be 0.

The memory base register upper 32 bits contains the upper half of the

base address.

12.1.20

PREFETCHABLE MEMORY LIMIT ADDRESS REGISTER –

OFFSET 24h

Bit

Function

Type

Description

19:16

64-bit addressing

R/O

Indicates 64-bit addressing

0000: 32-bit addressing

0001: 64-bit addressing

Reset to 1

PI7C8152AMA Datasheet(PDF) 73 Page - Pericom Semiconductor Corporation

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