XIO2001 datasheet(104/128 Pages) TI

104 / 128 page

XIO2001

SCPS212D – MAY 2009 – REVISED JANUARY 2010

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6.2

Revision ID Register

The revision ID register identifies the revision of the TI proprietary layout for this device control map. The

value 00h identifies the revision as the initial layout.

Device control memory window register offset:

01h

Read-only

Default value:

00h

BIT NUMBER

RESET STATE

6.3

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). This register is an alias of the GPIO

control register in the classic PCI configuration space(offset B4h, see Section 4.59). See Table 6-2 for a

complete description of the register contents.

Device control memory window register offset:

40h

Read-only, Read/Write

Default value:

0000h

BIT NUMBER

RESET STATE

Table 6-2. GPIO Control Register Description

BIT

FIELD NAME

ACCESS

DESCRIPTION

15:5

RSVD

Reserved. Returns 0000 0000 000b 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 (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.

104

Memory-Mapped TI Proprietary Register Space

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