
170
Am79C976
8/01/00
P R E L I M I N A R Y
SVID_A: PCI Subsystem Vendor ID Alias Register
Offset 1B6h
This register is a writable alias of the Subsystem Ven-
dor ID field at offset 2Ch in PCI configuration space,
which is read only. The purpose of this register is to
allow the PCI Subsystem Vendor ID value to be loaded
from the serial EEPROM.
The contents of this register are cleared to 0 when the
RST pin is asserted, before the serial EEPROM is
read, and after a serial EEPROM read error.
Table 80. SVID: PCI Subsystem Vendor ID Shadow Register
TEST0: Test Register
Offset 1A8h
This register is used for factory test purposes only. All
bits must be zero for normal operation.
Table 81. TEST0: Test Register
Bit
Name
Description
15-0
SVID
Subsystem Vendor ID. SVID is used together with the PCI Subsystem ID Register to uniquely
identify the add-in board or subsystem the Am79C976 controller is used in. Subsystem Vendor IDs
can be obtained form the PCI SIG. A value of 0 (the default) indicates that the Am79C976 controller
does not support subsystem identification. SVID is aliased to the PCI configuration space register
Subsystem Vendor ID (offset 2Ch).
This register is an alias of BCR23 and of the PCI configuration space Subsystem Vendor
ID field at offset 2Ch.
Bit
Name
Description
31:18
RES
Factory test bits; must be 0 for normal operation.
17
CBIO_EN
Factory test bit; must be 0 for normal operation.
16:14
RES
Factory test bits; must be 0 for normal operation.
13
EEBUSY_T
Factory test bit; must be 0 for normal operation.
12
RES
Factory test bit; must be 0 for normal operation.
11
TSEL
Factory test bit; must be 0 for normal operation.
10
MFSM_RESET
Factory test bit; must be 0 for normal operation.
9
BFD_SCALE_DOWN
Factory test bit; must be 0 for normal operation.
8
ANTST
Factory test bit; must be 0 for normal operation.
7:6
RES
Factory test bits; must be 0 for normal operation.
5
LEDCHTTST
Factory test bit; must be 0 for normal operation.
4
RTYTST_BUMP
Factory test bit; must be 0 for normal operation.
3
RTYTST_OUT
Factory test bit; must be 0 for normal operation.
2
RTYTST_RANGEN
Factory test bit; must be 0 for normal operation.
1
RTYTST_SLOT
Factory test bit; must be 0 for normal operation.
0
SERRLEVEL
Factory test bit; must be 0 for normal operation.