Subsystem vendor id, Registers: 0x2c–0x2d – Avago Technologies LSI53C896 User Manual
Page 123
PCI Configuration Registers
4-11
Version 3.3
Copyright © 1998–2003 by LSI Logic Corporation. All rights reserved.
Registers: 0x2C–0x2D
Subsystem Vendor ID
Read Only
SVID
Subsystem Vendor ID
[15:0]
This 16-bit register uniquely identifies the vendor
manufacturing the add-in board or subsystem where this
PCI device resides. It provides a mechanism for an
add-in card vendor to distinguish its cards from another
vendor’s cards, even if the cards have the same PCI
controller installed on them (and therefore the same
Vendor ID and Device ID).
If the external serial EEPROM interface is enabled
(MAD[7] LOW), this register is automatically loaded at
power-up from the external serial EEPROM and contain
the value downloaded from the serial EEPROM or a
value of 0x0000 if the download fails.
If the external serial EEPROM interface is disabled
(MAD[7] HIGH), this register returns a value of 0x1000.
The 16-bit value that should be stored in the external
serial EEPROM for this register is the vendor’s PCI
Vendor ID and must be obtained from the PCI Special
Interest Group (SIG). Refer to
Section 2.4, “Serial EEPROM Interface,”
for details on
downloading a value for this register.
15
0
SVID
If MAD[7] Is HIGH
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
If MAD[7] is LOW
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x