PCI7510 datasheet(46/234 Pages) TI

46 / 234 page

3–6

configuration space (see Section 11.25, Subsystem Access Register). See Table 11–9 for a complete description of

the register contents.

3.6

PC Card Applications

The PCI7510 device supports all the PC Card features and applications as described below.

•

Card insertion/removal and recognition per the PC Card Standard (release 8.0)

•

Zoomed video support

•

Speaker and audio applications

•

LED socket activity indicators

•

PC Card controller programming model

•

CardBus socket registers

3.6.1

PC Card Insertion/Removal and Recognition

The PC Card Standard (release 8.0) 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.

3.6.2

Low Voltage CardBus Card Detection

The card detection logic of the PCI7510 device includes the detection of Cardbus cards with VCC = 3.3 V and

VPP = 1.8 V. The reporting of the 1.8-V CardBus card (VCC = 3.3 V, VPP = 1.8 V) is reported through the socket present

state register as follows based on bit 10 (12V_SW_SEL) in the general control register (PCI offset 86h, see Section

4.31):

•

If the 12V_SW_SEL bit is 0 (TPS2221 is used), then the 1.8-V CardBus card causes the 3VCARD bit in the

socket present state register to be set.

•

If the 12V_SW_SEL bit is 1 (TPS2211A is used), then the 1.8-V CardBus card causes the XVCARD bit in

the socket present state register to be set.

3.6.3

Card Detection

The PC Card Standard addresses the card detection and recognition process through an interrogation procedure that

the socket must initiate upon card insertion into a cold, unpowered socket. Through this interrogation, card voltage

requirements and interface type (16-bit vs. CardBus) are determined. The scheme uses the CD1, CD2, VS1, and VS2

signals (CCD1, CCD2, CVS1, CVS2 for CardBus). A PC Card designer connects these four terminals in a certain

configuration to indicate the type of card and its supply voltage requirements. The encoding scheme for this, defined

in the PC Card Standard, is shown in Table 3–2.

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