Avago Technologies LSI53C876E - Manual (Page 106)

4-12 Registers
Register: 0x2E
Subsystem ID
Read Only
SID Subsystem ID [15:0]
This register uniquely identifies 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 one another even if the cards have the same
PCI controller installed on them (and therefore the same
Vendor ID and Device ID). This register loads
automatically at power-up from an external serial
EEPROM if in operating mode A and the load from
EEPROM is successful. The 16-bit value that should be
stored in the external serial EEPROM for this register is
vendor specific. If in operating mode D, this register is
loaded with a default value of 0x1000. If an error occurs
during a load from EEPROM or if the operating mode
is B, this register defaults to a value of 0x0000. See
Section 2.4, “Serial EEPROM Interface,” in Chapter 2,
“Functional Description,” for information about the values
to load in this register.
15 0
SID
If EEPROM not enabled Mode A
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
If EEPROM note enabled Mode D
1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0
EEPROM value if EEPROM enabled
x x x x x x x x x x x x x x x x