PI7C8150ANDE datasheet(83/111 Pages) PERICOM

83 / 111 page

PI7C8150A

2-PORT PCI-TO-PCI BRIDGE

Page 83 of 111

APRIL 2006 – Revision 1.1

Bit

Function

Type

Description

Received Master

Abort

R/WC

Set to 1 (by a master) when transactions on its secondary interface

are terminated with Master Abort

Reset to 0

Received System

Error

R/WC

Set to 1 when S_SERR_L is asserted

Reset to 0

Detected Parity

Error

R/WC

Set to 1 when address or data parity error is detected on the

secondary interface

Reset to 0

14.1.17

MEMORY BASE REGISTER – OFFSET 20h

Bit

Function

Type

Description

3:0

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

14.1.18

MEMORY LIMIT REGISTER – OFFSET 20h

Bit

Function

Type

Description

19:16

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.

14.1.19

PEFETCHABLE MEMORY BASE 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.

06-0057

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