LAN9312 datasheet(31/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9312

Revision 1.2 (04-08-08)

DATASHEET

Note: Refer to Chapter 8, "Host Bus Interface (HBI)," on page 99 for additional information regarding

the use of these signals.

Data FIFO

Direct Access

Select

FIFO_SEL

Data FIFO Direct Access Select: When driven

high, all accesses to the LAN9312 are directed to

the RX and TX Data FIFO’s. All reads are from the

RX Data FIFO, and all writes are to the TX Data

FIFO. In this mode, the address input is ignored.

Refer to Section 14.1.3, "Direct FIFO Access

Mode," on page 167 for additional information.

Endianess

Select

END_SEL

Endianess Select: When this signal is set high,

big endian mode is selected. When low, little

endian mode is selected. This signal may be

dynamically changed or held static. Refer to

Chapter 8, "Host Bus Interface (HBI)," on page 99

for additional information.

Table 3.5 EEPROM Pins

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

EEPROM

Microwire

Data Input

EEDI

(PD)

EEPROM Microwire Data Input (EEDI): In

Microwire EEPROM mode (EEPROM_TYPE = 0),

this pin is the Microwire EEPROM serial data input.

EEPROM I2C

Serial Data

Input/Output

EE_SDA

IS/OD8

EEPROM I2C Serial Data Input/Output

(EE_SDA): In I2C EEPROM mode

(EEPROM_TYPE = 1), this pin is the I2C EEPROM

serial data input/output.

EEPROM

Microwire

Data Output

EEDO

EEPROM Microwire Data Output: In Microwire

EEPROM mode (EEPROM_TYPE = 0), this pin is

the Microwire EEPROM serial data output.

Note:

In I2C mode (EEPROM_TYPE=1), this pin

is not used and is driven low.

EEPROM

Type Strap

EEPROM_TYPE

Note 3.3

EEPROM Type Strap: Configures the EEPROM

type. See Note 3.4

0 = Microwire Mode

1 = I2C Mode

EEPROM

Microwire

Serial Clock

EECLK

EEPROM Microwire Serial Clock (EECLK): In

Microwire EEPROM mode (EEPROM_TYPE = 0),

this pin is the Microwire EEPROM clock output.

EEPROM I2C

Serial Clock

EE_SCL

IS/OD8

EEPROM I2C Serial Clock (EE_SCL): In I2C

EEPROM mode (EEPROM_TYPE=1), this pin is

the I2C EEPROM clock input/open-drain output.

EEPROM

Size Strap 1

EEPROM_SIZE_1

Note 3.5

EEPROM Size Strap 1: Configures the high bit of

the EEPROM size range as specified in Section

10.2, "I2C/Microwire Master EEPROM Controller,"

on page 137. This bit is not used for I2C

EEPROMs. See Note 3.4.

Table 3.4 Host Bus Interface Pins (continued)

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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