PCI7421 datasheet(44/298 Pages) TI

44 / 298 page

2−18

Table 2−9. Multifunction and Miscellaneous Terminals

The power rail designation is not applicable for the multifunction and miscellaneous terminals.

TERMINAL

DESCRIPTION

I/O

INPUT

OUTPUT

PU/

EXTERNAL

PIN STRAPPING

NAME

NO.

DESCRIPTION

I/O

TYPE

INPUT

OUTPUT

PU/

EXTERNAL

COMPONENTS

PIN STRAPPING

(IF UNUSED)

A_USB_EN

B_USB_EN

E02

E01

USB enable. These output terminals control an

external CBT switch for each socket when an USB

card is inserted into the socket.

LVCO1

CBT switch

Float

CLK_48

M01

A 48-MHz clock must be connected to this terminal.

LVCI1

48 MHz clock

source

MFUNC0

N03

I/O

PCII3

PCIO3

10-k

Ω to 47-kΩ

pullup resistor

MFUNC1

M05

I/O

PCII3

PCIO3

10-k

Ω to 47-kΩ

pullup resistor

MFUNC2

P01

Multifunction terminals 0−6. See Section 4.36,

I/O

PCII3

PCIO3

10-k

Ω to 47-kΩ

pullup resistor

MFUNC3

P02

Multifunction terminals 0−6. See Section 4.36,

Multifunction Routing Status Register, for

configuration details.

I/O

PCII3

PCIO3

10-k

Ω to 47-kΩ

pullup resistor

MFUNC4

P03

configuration details.

I/O

PCII3

PCIO3

10-k

Ω to 47-kΩ

pullup resistor

MFUNC5

N05

I/O

PCII3

PCIO3

10-k

Ω to 47-kΩ

pullup resistor

MFUNC6

R01

I/O

PCII3

PCIO3

10-k

Ω to 47-kΩ

pullup resistor

W17

Reserved. This terminal has no connection

anywhere within the package.

Float

PHY_TEST_

R17

PHY test pin. Not for customer use. It must be pulled

high with a 4.7-k

Ω resistor.

LVCI1

PD1

RI_OUT/

PME

T03

Ring indicate out and power management event

output. This terminal provides an output for

ring-indicate or PME signals.

LVCO2

Pullup resistor per

PCI specification

RSVD

T19

Reserved. This terminal has no connection

anywhere within the package.

—

Float

SCL

M03

Serial clock. At PRST, the SCL signal is sampled to

determine if a two-wire serial ROM is present. If the

serial ROM is detected, then this terminal provides

the serial clock signaling and is implemented as

open-drain. For normal operation (a ROM is

implemented in the design), this terminal must be

pulled high to the ROM VDD with a 2.7-kΩ resistor.

Otherwise, it must be pulled low to ground with a

220-

Ω resistor.

I/O

TTLI1

TTLO1

Pullup resistor per

I2C specification

(value depends on

EEPROM,

typically 2.7 k

Ω)

Tie to GND if not

using EEPROM

SDA

M02

Serial data. This terminal is implemented as

open-drain, and for normal operation (a ROM is

implemented in the design), this terminal must be

pulled high to the ROM VDD with a 2.7-kΩ resistor.

Otherwise, it must be pulled low to ground with a

220-

Ω resistor.

I/O

TTLI1

TTLO1

Pullup resistor per

I2C specification

(value depends on

EEPROM,

typically 2.7 k

Ω)

Tie to GND if not

using EEPROM

SPKROUT

L07

Speaker output. SPKROUT is the output to the host

system that can carry SPKR or CAUDIO through the

controller from the PC Card interface. SPKROUT is

driven as the exclusive-OR combination of card

SPKR//CAUDIO inputs.

TTLO1

10-k

Ω to 47-kΩ

pulldown resistor

10-k

Ω to 47-kΩ

pulldown resistor

SUSPEND

R02

Suspend. SUSPEND protects the internal registers

from clearing when the GRST or PRST signal is

asserted. See Section 3.8.6, Suspend Mode, for

details.

PCII6

10-k

Ω to 47-kΩ

pullup resistor

10-k

Ω to 47-kΩ

pullup resistor

TEST0

P12

Terminal TEST0 is used for factory test of the

controller and must be connected to ground for

normal operation.

I/O

LVCI1

PD1

Tie to GND

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