Datasheet

XIO2001
SCPS212G –MAY 2009–REVISED DECEMBER 2012 www.ti.com
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
Register type: Read-only
Default value: 00h
BIT NUMBER 7 6 5 4 3 2 1 0
RESET STATE 0 0 0 0 0 0 0 0
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
Register type: Read-only, Read/Write
Default value: 0000h
BIT NUMBER 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RESET STATE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Table 6-2. GPIO Control Register Description
BIT FIELD NAME ACCESS DESCRIPTION
15:5 RSVD R Reserved. Returns 0000 0000 000b when read.
4
(1)
GPIO4_DIR RW GPIO 4 data direction. This bit selects whether GPIO4 is in input or output mode.
0 = Input (default)
1 = Output
3
(1)
GPIO3_DIR RW GPIO 3 data direction. This bit selects whether GPIO3 is in input or output mode.
0 = Input (default)
1 = Output
2
(1)
GPIO2_DIR RW GPIO 2 data direction. This bit selects whether GPIO2 is in input or output mode.
0 = Input (default)
1 = Output
1
(1)
GPIO1_DIR RW GPIO 1 data direction. This bit selects whether GPIO1 is in input or output mode.
0 = Input (default)
1 = Output
0
(1)
GPIO0_DIR RW 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 Copyright © 2009–2012, Texas Instruments Incorporated
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