XIO2001IPNP datasheet(71/131 Pages) TI

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XIO2001

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SCPS212D – MAY 2009 – REVISED JANUARY 2010

Table 4-32. Serial-Bus Control and Status Register Description (continued)

BIT

FIELD NAME

ACCESS

DESCRIPTION

2 (1)

SBTEST

Serial-bus test. This bit is used for internal test purposes. This bit controls the clock source

for the serial interface clock.

0 = Serial-bus clock at normal operating frequency ~ 60 kHz (default)

1 = Serial-bus clock frequency increased for test purposes ~ 4 MHz

1 (1)

SB_ERR

RCU

Serial-bus error. This bit is set when an error occurs during a software-initiated serial-bus

cycle.

0 = No error

1 = Serial-bus error

0 (1)

ROM_ERR

RCU

Serial EEPROM load error. This bit is set when an error occurs while downloading registers

from serial EEPROM.

0 = No error

1 = EEPROM load error

4.59 GPIO Control Register

This register controls the direction of the five GPIO terminals. This register has no effect on the behavior

of GPIO terminals that are enabled to perform secondary functions. The secondary functions share GPIO0

(CLKRUN), GPIO1 (PWR_OVRD), GPIO3 (SDA), and GPIO4 (SCL). See Table 4-33 for a complete

description of the register contents.

PCI register offset:

B4h

Read-only, Read/Write

Default value:

0000h

BIT NUMBER

RESET STATE

Table 4-33. GPIO Control Register Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

15:5

RSVD

Reserved. Return 000h when read.

4 (1)

GPIO4_DIR

GPIO 4 data direction. This bit selects whether GPIO4 is in input or output mode.

0 = Input (default)

1 = Output

3(1)

GPIO3_DIR

GPIO 3 data direction. This bit selects whether GPIO3 is in input or output mode.

0 = Input (default)

1 = Output

2 (1)

GPIO2_DIR

GPIO 2 data direction. This bit selects whether GPIO2 is in input or output mode.

0 = Input (default)

1 = Output

(1)

GPIO1_DIR

GPIO 1 data direction. This bit selects whether GPIO1 is in input or output mode.

0 = Input (default)

1 = Output

0 (1)

GPIO0_DIR

GPIO 0 data direction. This bit selects whether GPIO0 is in input or output mode.

0 = Input (default)

1 = Output

(1)

These bits are reset by a PCI Express reset (PERST), a GRST, or the internally-generated power-on reset.

Classic PCI Configuration Space

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