LAN9420 Datasheet, PDF (94/171 Pages) SMSC Corporation – Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
BITS
10:8
7:5
4:3
2:0
DESCRIPTION
GPIO Direction 0-2 (GPDIRn)
When set, enables the corresponding GPIO as an output. When cleared the
GPIO is enabled as an input. Bits are assigned as follows:
GPIO0 – bit 8
GPIO1 – bit 9
GPIO2 – bit 10
RESERVED
GPO Data 3-4 (GPODn)
The value written is reflected on GPOn. Bits are assigned as follows:
GPO3 – bit 3
GPO4 – bit 4
GPIO Data 0-2 (GPIODn)
When enabled as an output, the value written is reflected on GPIOn. When
read, GPIOn reflects the current state of the corresponding GPIO pin. Bits
are assigned as follows:
GPIO0 – bit 0
GPIO1 – bit 1
GPIO2 – bit 2
Note 4.2 Default value is dependent on the state of the GPIO pin.
TYPE
R/W
RO
R/W
R/W
DEFAULT
000b
-
00b
Note 4.2
Table 4.3 EEPROM Enable Bit Definitions
[22]
[21]
[20]
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
EEDIO FUNCTION
EEDIO
GPO3
GPO3
TX_EN
TX_EN
TX_CLK
Reserved
Reserved
EECLK FUNCTION
EECLK
GPO4
RX_DV
GPO4
RX_DV
RX_CLK
Revision 1.6 (07-18-11)
94
DATASHEET
SMSC LAN9420/LAN9420i