SMSC LAN9311, LAN9311i 3.2Pin Descriptions

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Datasheet

3.2Pin Descriptions

This section contains the descriptions of the LAN9311/LAN9311i pins. The pin descriptions have been broken into functional groups as follows:

„LAN Port 1 Pins

„LAN Port 2 Pins

„LAN Port 1 & 2 Power and Common Pins

„Host Bus Interface Pins

„EEPROM Pins

„Dedicated Configuration Strap Pins

„Miscellaneous Pins

„PLL Pins

„Core and I/O Power and Ground Pins

„No-Connect Pins

Note: A list of buffer type definitions is provided in Section 1.2, "Buffer Types," on page 18.

Table 3.1 LAN Port 1 Pins

			BUFFER
PIN	NAME	SYMBOL	TYPE	DESCRIPTION
	Port 1 LED	nP1LED[3:0]	OD12	LED Indicators: When configured as LED outputs
	Indicators			via the LED Configuration Register (LED_CFG),
				these pins are open-drain, active low outputs and
				the pull-ups and input buffers are disabled. The
				functionality of each pin is determined via the
				LED_CFG[9:8] bits.
	General	GPIO[3:0]	IS/O12/	General Purpose I/O Data: When configured as
89-92	Purpose I/O		OD12	GPIO via the LED Configuration Register
	Data		(PU)	(LED_CFG), these general purpose signals are
				fully programmable as either push-pull outputs,
				open-drain outputs or Schmitt-triggered inputs by
				writing the General Purpose I/O Configuration
				Register (GPIO_CFG) and General Purpose I/O
				Data & Direction Register (GPIO_DATA_DIR). The
				pull-ups are enabled in GPIO mode. The input
				buffers are disabled when set as an output.
				Note: See Chapter 13, "GPIO/LED Controller,"
				on page 163 for additional details.
	Port 1	TXN1	AIO	Ethernet TX Negative: Negative output of Port 1
110	Ethernet TX			Ethernet transmitter. See Note 3.1 for additional
	Negative			information.
	Port 1	TXP1	AIO	Ethernet TX Positive: Positive output of Port 1
111	Ethernet TX			Ethernet transmitter. See Note 3.1 for additional
	Positive			information.
	Port 1	RXN1	AIO	Ethernet RX Negative: Negative input of Port 1
115	Ethernet RX			Ethernet receiver. See Note 3.1 for additional
	Negative			information.
	Port 1	RXP1	AIO	Ethernet RX Positive: Positive input of Port 1
116	Ethernet RX			Ethernet receiver. See Note 3.1 for additional
	Positive			information.

Revision 1.4 (08-19-08)	28	SMSC LAN9311/LAN9311i
	DATASHEET