PCI6421 datasheet(52/204 Pages) TI

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3−4

3.4.4

Function 3 (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 7.22, Subsystem Access Register). See Table 7−15 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 7−15 for a complete description of the register

contents.

3.4.5

Function 4 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 8.23, Subsystem Access Register). See Table 8−16 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 8−16 for a complete description of the register

contents.

3.4.6

Function 5 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 9.23, Subsystem ID Alias Register). See Table 9−14 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 5 PCI offsets 2Ch and 2Eh, respectively. See Table 9−14 for a complete description of the register

contents.

3.5

PC Card Applications

The PCI6x21/PCI6x11 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

3.5.1

PC Card Insertion/Removal and Recognition

The PC Card Standard (release 8.1) addresses the card-detection and recognition process through an interrogation

procedure that the socket must initiate on card insertion into a cold, nonpowered socket. Through this interrogation,

card voltage requirements and interface (16-bit versus CardBus) are determined.

The scheme uses the card-detect and voltage-sense signals. The configuration of these four terminals identifies the

card type and voltage requirements of the PC Card interface.

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