Subsystem vendor id, Register: 0x2c–0x2d – Avago Technologies LSI53C1020 User Manual
Page 91
PCI Configuration Space Register Descriptions
4-13
Version 2.4
Copyright © 2001–2004 by LSI Logic Corporation. All rights reserved.
Register: 0x2C–0x2D
Subsystem Vendor ID
Read Only
Subsystem Vendor ID
[15:0]
This 16-bit register uniquely identifies the vendor that
manufactures the add-in board or subsystem where the
LSI53C1020 resides. This register provides a mechanism
for an add-in card vendor to distinguish their cards from
another vendor’s cards, even if the cards use the same
PCI controller (and have the same Vendor ID and
Device ID).
The external serial EEPROM can hold a vendor-specific,
16-bit value for this register, which the board designer
must obtain from the PCI Special Interest Group
(PCI-SIG). By default, an internal pull-down on the
MAD[7] Power-On Sense pin enables the serial EEPROM
interface so that the LSI53C1020 can load this register
from the serial EEPROM at power-up. If the download
from the EEPROM fails, this register contains 0x0000.
If the board designer disables the EEPROM interface by
pulling the MAD[7] Power-On Sense pin HIGH, this reg-
ister returns a value of 0x1000. Refer to
“Power-On Sense Pins Description,” page 3-18
, for more
information.
15
0
Subsystem Vendor ID
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x