XIO2001 datasheet(26/131 Pages) TI

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XIO2001 PCI Express™ to PCI Bus Translation Bridge

SCPS212B – MAY 2009 – REVISED JULY 2009

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Table 2-10. Miscellaneous Terminals (continued)

ZGU

ZAJ

I/O

CELL

CLAMP

EXTERNAL

SIGNAL

DESCRIPTION

BALL #

TYPE

RAIL

PARTS

GPIO0 //

N09

I/O

VDD_33

General-purpose I/O 0/clock run. This terminal

CLKRUN

CMOS

functions as a GPIO controlled by bit 0

(GPIO0_DIR) in the GPIO control register (see

Section 4.59) or the clock run terminal. This

terminal is used as clock run input when the

bridge is placed in clock run mode.

Optional

pullup

Note: In clock run mode, an external pullup

resistor

resistor is required to prevent the CLKRUN

signal from floating.

Note: This terminal has an internal active

pullup resistor. The pullup is only active when

reset is asserted or when the GPIO is

configured as an input.

GPIO1 //

M09

I/O

VDD_33

General-purpose I/O 1/power override. This

PWR_OVR

CMOS

terminal functions as a GPIO controlled by bit 1

(GPIO1_DIR) in the GPIO control register (see

Section 4.59) or the power override output

terminal. GPIO1 becomes PWR_OVRD when

bits 22:20 (POWER_OVRD) in the general

–

control register are set to 001b or 011b (see

Section 4.65).

Note: This terminal has an internal active

pullup resistor. The pullup is only active when

reset is asserted or when the GPIO is

configured as an input.

GPIO2

N10

I/O

VDD_33

General-purpose I/O 2. This terminal functions

CMOS

as a GPIO controlled by bit 2 (GPIO2_DIR) in

the GPIO control register (see Section 4.59).

–

Note: This terminal has an internal active

pullup resistor. The pullup is only active when

reset is asserted or when the GPIO is

configured as an input.

GPIO3 //

N11

L08

I/O

VDD_33

GPIO3

serial-bus

data.

This

terminal

SDA

CMOS

functions as serial-bus data if a pullup resistor

is detected on SCL or when the SBDETECT bit

is set in the Serial Bus Control and Status

Optional

pullup

detected

then

this

terminal

functions

resistor

GPIO3.

Note: In serial-bus mode, an external pullup

resistor is required to prevent the SDA signal

from floating.

GPIO4 //

M10

I/O

VDD_33

GPIO4

serial-bus

clock.

This

terminal

SCL

CMOS

functions as serial-bus clock if a pullup resistor

is detected on SCL or when the SBDETECT bit

is set in the Serial Bus Control and Status

detected

then

this

terminal

functions

Optional

GPIO4.

pullup

Note: In serial-bus mode, an external pullup

resistor

resistor is required to prevent the SCL signal

from floating.

Note: This terminal has an internal active

pullup resistor. The pullup is only active when

reset is asserted or when the GPIO is

configured as an input.

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