PI7C8150AND datasheet(78/111 Pages) PERICOM

78 / 111 page

PI7C8150A

2-PORT PCI-TO-PCI BRIDGE

Page 78 of 111

APRIL 2006 – Revision 1.1

14.1.1

VENDOR ID REGISTER – OFFSET 00h

Bit

Function

Type

Description

15:0

Vendor ID

R/O

Identifies Pericom as vendor of this device. Hardwired as 12D8h.

14.1.2

DEVICE ID REGISTER – OFFSET 00h

Bit

Function

Type

Description

31:16

Device ID

R/O

Identifies this device as the PI7C8150A. Hardwired as 8150h.

14.1.3

COMMAND REGISTER – OFFSET 04h

Bit

Function

Type

Description

I/O Space Enable

R/W

Controls response to I/O access on the primary interface

0: ignore I/O transactions on the primary interface

1: enable response to I/O transactions on the primary interface

Reset to 0

Memory Space

Enable

R/W

Controls response to memory accesses on the primary interface

0: ignore memory transactions on the primary interface

1: enable response to memory transactions on the primary interface

Reset to 0

Bus Master

Enable

R/W

Controls ability to operate as a bus master on the primary interface

0: do not initiate memory or I/O transactions on the primary

interface and disable response to memory and I/O transactions on

the secondary interface

1: enables PI7C8150A to operate as a master on the primary

interfaces for memory and I/O transactions forwarded from the

secondary interface

Reset to 0

Special Cycle

Enable

R/O

No special cycles defined.

Bit is defined as read only and returns 0 when read

Memory Write

And Invalidate

Enable

R/O

Memory write and invalidate not supported.

Bit is implemented as read only and returns 0 when read (unless

forwarding a transaction for another master)

VGA Palette

Snoop Enable

R/W

Controls response to VGA compatible palette accesses

0: ignore VGA palette accesses on the primary

1: enable positive decoding response to VGA palette writes on the

primary interface with I/O address bits AD[9:0] equal to 3C6h,

3C8h, and 3C9h (inclusive of ISA alias; AD[15:10] are not decoded

and may be any value)

06-0057

PI7C8150AND Datasheet(PDF) 78 Page - Pericom Semiconductor Corporation

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