High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX & Industrial Temperature Support
Datasheet
5.3.14
GPIO_CFG—General Purpose IO Configuration Register
Offset:
88h
Size:
32 bits
This register configures the GPIO and LED functions.
BITS
DESCRIPTION
TYPE
DEFAULT
31
Reserved
RO
-
30:28
LED[3:1] enable (LEDx_EN). A ‘1’ sets the associated pin as an LED
output. When cleared low, the pin functions as a GPIO signal.
LED1/GPIO0 – bit 28
R/W
000
LED2/GPIO1 – bit 29
LED3/GPIO2 – bit 30
27
Reserved
RO
-
26:24
GPIO Interrupt Polarity 0-2 (GPIO_INT_POL). When set high, a high logic
level on the corresponding GPIO pin will set the corresponding INT_STS
register bit. When cleared low, a low logic level on the corresponding GPIO
pin will set the corresponding INT_STS register bit.
GPIO Interrupts must also be enabled in GPIOx_INT_EN in the INT_EN
register.
R/W
000
GPIO0 – bit 24
GPIO1 – bit 25
GPIO2 – bit 26
Note:
GPIO inputs must be active for greater than 40nS to be recognized
as interrupt inputs.
23
Reserved
RO
-
22:20
EEPROM Enable (EEPR_EN). The value of this field determines the
function of the external EEDIO and EECLK:
Please refer to Table 5.4 for the EEPROM Enable bit function definitions.
R/W
000
Note:
The host must not change the function of the EEDIO and EECLK
pins when an EEPROM read or write cycle is in progress. Do not
use reserved settings.
19
Reserved
RO
-
18:16
GPIO Buffer Type 0-2 (GPIOBUFn). When set, the output buffer for the
corresponding GPIO signal is configured as a push/pull driver. When
cleared, the corresponding GPIO set configured as an open-drain driver.
GPIO0 – bit 16
R/W
000
GPIO1 – bit 17
GPIO2 – bit 18
15:11
10:8
Reserved
RO
-
GPIO Direction 0-2 (GPDIRn). When set, enables the corresponding GPIO
as output. When cleared the GPIO is enabled as an input.
R/W
0000
GPIO0 – bit 8
GPIO1 – bit 9
GPIO2 – bit 10
7:5
4:3
Reserved
RO
-
GPO Data 3-4 (GPODn). The value written is reflected on GPOn.
GPO3 – bit 3
GPO4 – bit 4
R/W
00
SMSC LAN9218I
Revision 1.5 (07-18-06)
DATA8S3HEET
SMSC [ SMSC CORPORATION ]
