
Principles of Operation
47
September 2005
SCPS110
The controller provides a two-line serial-bus host controller that can interface to a serial EEPROM. See
Section 3.6, Serial EEPROM Interface, for details on the two-wire serial-bus controller and applications.
3.4.5 Function 1 (OHCI 1394) Subsystem Identification
The subsystem identification register is used for system and option card identification purposes. This register
can be initialized from the serial EEPROM or programmed via the subsystem access register at offset F8h
in the PCI configuration space (see Section 7.25, Subsystem Access Register). See Table 722 for a complete
description of the register contents.
Write access to the subsystem access register updates the subsystem identification registers identically to
OHCI-Lynx
. The contents of the subsystem access register are aliased to the subsystem vendor ID and
subsystem ID registers at Function 1 PCI offsets 2Ch and 2Eh, respectively. The system ID value written to
this register may also be read back from this register. See Table 722 for a complete description of the register
contents.
3.4.6 Function 2 (Flash Media) Subsystem Identification
The subsystem identification register is used for system and option card identification purposes. This register
can be initialized from the serial EEPROM or programmed via the subsystem access register at offset 50h in
the PCI configuration space (see Section 11.22, Subsystem Access Register). See Table 1115 for a complete
description of the register contents.
The contents of the subsystem access register are aliased to the subsystem vendor ID and subsystem ID
registers at Function 2 PCI offsets 2Ch and 2Eh, respectively. See Table 1115 for a complete description of
the register contents.
3.4.7 Function 3 (SD Host) Subsystem Identification
The subsystem identification register is used for system and option card identification purposes. This register
can be initialized from the serial EEPROM or programmed via the subsystem access register at offset 8Ch
in the PCI configuration space (see Section 12.23, Subsystem Access Register). See Table 1216 for a
complete description of the register contents.
The contents of the subsystem access register are aliased to the subsystem vendor ID and subsystem ID
registers at Function 3 PCI offsets 2Ch and 2Eh, respectively. See Table 1216 for a complete description of
the register contents.
3.4.8 Function 4 (Smart Card) Subsystem Identification
The subsystem identification register is used for system and option card identification purposes. This register
can be initialized from the serial EEPROM or programmed via the subsystem access register at offset 50h in
the PCI configuration space (see Section 13.23, Subsystem ID Alias Register). See Table 1314 for a
complete description of the register contents.
The contents of the subsystem access register are aliased to the subsystem vendor ID and subsystem ID
registers at Function 4 PCI offsets 2Ch and 2Eh, respectively. See Table 1314 for a complete description of
the register contents.
3.5
PC Card Applications
The PCIxx12 controller supports all the PC Card features and applications as described below.
Card insertion/removal and recognition per the PC Card Standard (release 8.1)
Speaker and audio applications
LED socket activity indicators
PC Card controller programming model
CardBus socket registers