Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Datasheet

BITS

 

 

 

 

 

DESCRIPTION

 

 

TYPE

DEFAULT

 

 

 

 

 

 

 

 

 

10:8

GPIO Direction 0-2 (GPDIRn)

 

 

R/W

000b

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7:5

RESERVED

 

 

 

 

 

RO

-

 

 

 

 

 

 

 

 

 

 

4:3

GPO Data 3-4 (GPODn)

 

 

 

R/W

00b

 

The value written is reflected on GPOn. Bits are assigned as follows:

 

 

 

GPO3 – bit 3

 

 

 

 

 

 

 

 

GPO4 – bit 4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2:0

GPIO Data 0-2 (GPIODn)

 

 

 

R/W

Note 4.2

 

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.

 

 

 

 

 

Table 4.3 EEPROM Enable Bit Definitions

 

 

 

 

 

 

 

 

 

 

[22]

 

[21]

 

[20]

 

EEDIO FUNCTION

 

EECLK FUNCTION

 

 

 

 

 

 

 

 

 

 

 

0

 

0

 

0

 

EEDIO

 

 

EECLK

 

 

 

 

 

 

 

 

 

 

 

 

0

 

0

 

1

 

GPO3

 

 

GPO4

 

 

 

 

 

 

 

 

 

 

 

0

 

1

 

0

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

0

 

1

 

1

 

GPO3

 

 

RX_DV

 

 

 

 

 

 

 

 

 

 

 

1

 

0

 

0

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

1

 

0

 

1

 

TX_EN

 

 

GPO4

 

 

 

 

 

 

 

 

 

 

 

 

1

 

1

 

0

 

TX_EN

 

 

RX_DV

 

 

 

 

 

 

 

 

 

 

 

 

1

 

1

 

1

 

TX_CLK

 

 

RX_CLK

 

 

 

 

 

 

 

 

 

 

 

 

SMSC LAN9420/LAN9420i

93

Revision 1.22 (09-25-08)

 

DATASHEET