PCI1031 datasheet(17/100 Pages) TI

17 / 100 page

PCI1031

PCI-TO-PC CARD16 CONTROLLER UNIT

SCPS008B – FEBRUARY 1996 – REVISED DECEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PC Cards

The 1995 PC Card standard provides a hardware- and software-interface standard for connecting

credit-card-sized memory and I/O cards to personal computers. By implementing compliant card slots, PC

manufacturers allow customers to use industry-standard PCMCIA memory and I/O cards from many different

vendors. The 1995 PC Card standard defines 16-bit and 32-bit PC Cards. The 16-bit PC Cards are an extension

of the PCMCIA 2.1/JEIDA 4.1 standards and are sometimes referred to as 16-bit cards or as R2 cards. The

32-bit PC Cards are a newly defined architecture called CardBus cards, with all 60 signals on the PC Card

interface redefined for a synchronous, 32-bit bus environment patterned after PCI.

PC Card insertion/removal and recognition

Prior to the PCMCIA 1995 PC Card standard, only two types of PC Cards existed: 16-bit memory cards and

16-bit I/O cards. Both types of cards were designed for 5-V VCC supply, and could be hot-inserted into a fully

powered socket. Upon insertion, 16-bit I/O cards were required to use the memory card signaling conventions

until host software had read the card information structure (CIS) and switched the socket and card to an

I/O mode.

The 1995 PC Card standard introduced several features, such as CardBus and 3.3-V/5-V card support, which

have challenged the idea of hot insertion and introduced a new card recognition scheme. Both CardBus cards

and 16-bit PC Cards can now be designed for 3.3-V VCC supply, which offers power savings, but could result

in card damage if such a card were inserted into a socket powered at 5 V. Similarly, the socket can no longer

automatically power a PC Card to 5-V VCC, so a method of detecting the voltage requirements and card type

is needed. The 1995 PC Card standard addresses this by describing an interrogation procedure that the socket

must initiate upon card insertion into a cold, unpowered socket.

This scheme uses the card CD1, CD2, VS1 and VS2 signals (called CCD1, CCD2, CVS1, and CVS2 for

CardBus cards). A PC Card designer connects these four pins in a certain configuration, depending on the type

of card (16-bit or CardBus) and the supply voltage (5 V, 3.3 V, X.X V, and/or Y.Y V). The encoding scheme for

this is defined in the 1995 PC Card standard and in Table 4.

Table 4. PC Card Card Detect and Voltage Sense Connections

CD2//CCD2

CD1//CCD1

VS2//CVS2

VS1//CVS1

KEY

INTERFACE

VOLTAGE

Ground

Open

5 V

16-bit PC Card

5 V

Ground

Open

Ground

5 V

16-bit PC Card

5 V and 3.3 V

Ground

5 V

16-bit PC Card

5 V, 3.3 V, and X.X V

Ground

Open

Ground

16-bit PC Card

3.3 V

Ground

Connect to CVS1

Open

Connect to CCD1

CardBus PC Card

3.3 V

Ground

16-bit PC Card

3.3 V and X.X V

Connect to CVS2

Ground

Connect to CCD2

Ground

CardBus PC Card

3.3 V and X.X V

Connect to CVS1

Ground

Connect to CCD2

CardBus PC Card

3.3 V, X.X V, and Y.Y V

Ground

Open

16-bit PC Card

X.X V

Connect to CVS2

Ground

Connect to CCD2

Open

CardBus PC Card

X.X V

Ground

Connect to CVS2

Connect to CCD1

Open

CardBus PC Card

X.X V and Y.Y V

Connect to CVS1

Ground

Open

Connect to CCD2

CardBus PC Card

Y.Y V

Ground

Connect to CVS1

Ground

Connect to CCD1

Reserved

Ground

Connect to CVS2

Connect to CCD1

Ground

Reserved

PCI1031 Datasheet(PDF) 17 Page - Texas Instruments

PCI1031 Datasheet(HTML) 17 Page - Texas Instruments

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