SMSC LAN9312 manual 31

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

Datasheet

Table 3.4 Host Bus Interface Pins (continued)

			BUFFER
PIN	NAME	SYMBOL	TYPE	DESCRIPTION
	Data FIFO	FIFO_SEL	IS	Data FIFO Direct Access Select: When driven
	Direct Access			high, all accesses to the LAN9312 are directed to
60	Select			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	END_SEL	IS	Endianess Select: When this signal is set high,
	Select			big endian mode is selected. When low, little
61				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.

Note: Refer to Chapter 8, "Host Bus Interface (HBI)," on page 99 for additional information regarding the use of these signals.

Table 3.5 EEPROM Pins

			BUFFER
PIN	NAME	SYMBOL	TYPE	DESCRIPTION
	EEPROM	EEDI	IS	EEPROM Microwire Data Input (EEDI): In
	Microwire		(PD)	Microwire EEPROM mode (EEPROM_TYPE = 0),
	Data Input			this pin is the Microwire EEPROM serial data input.
96
	EEPROM I2C	EE_SDA	IS/OD8	EEPROM I2C Serial Data Input/Output
	Serial Data			(EE_SDA): In I2C EEPROM mode
	Input/Output			(EEPROM_TYPE = 1), this pin is the I2C EEPROM
				serial data input/output.
	EEPROM	EEDO	O8	EEPROM Microwire Data Output: In Microwire
	Microwire			EEPROM mode (EEPROM_TYPE = 0), this pin is
	Data Output			the Microwire EEPROM serial data output.
				Note: In I2C mode (EEPROM_TYPE=1), this pin
98				is not used and is driven low.
	EEPROM	EEPROM_TYPE	IS	EEPROM Type Strap: Configures the EEPROM
	Type Strap		Note 3.3	type. See Note 3.4
				0 = Microwire Mode
				1 = I2C Mode
	EEPROM	EECLK	O8	EEPROM Microwire Serial Clock (EECLK): In
	Microwire			Microwire EEPROM mode (EEPROM_TYPE = 0),
	Serial Clock			this pin is the Microwire EEPROM clock output.
	EEPROM I2C	EE_SCL	IS/OD8	EEPROM I2C Serial Clock (EE_SCL): In I2C
99	Serial Clock			EEPROM mode (EEPROM_TYPE=1), this pin is
				the I2C EEPROM clock input/open-drain output.
	EEPROM	EEPROM_SIZE_1	IS	EEPROM Size Strap 1: Configures the high bit of
	Size Strap 1		Note 3.5	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.

SMSC LAN9312	31	Revision 1.4 (08-19-08)
	DATASHEET