LAN9313 datasheet(101/398 Pages) SMSC

101 / 398 page

Three Port 10/100 Managed Ethernet Switch with MII

Datasheet

SMSC LAN9313/LAN9313i

101

Revision 1.2 (04-08-08)

DATASHEET

Chapter 8 Serial Management

8.1

Functional Overview

This chapter details the serial management functionality provided by the LAN9313/LAN9313i, which

includes the EEPROM I2C/Microwire master, EEPROM Loader, SPI slave, and I2C slave controllers.

The I2C/Microwire EEPROM controller is an I2C/Microwire master module which interfaces an optional

external EEPROM with the system register bus and the EEPROM Loader. Multiple types

(I2C/Microwire) and sizes of external EEPROMs are supported. Configuration of the EEPROM type

and size are accomplished via the eeprom_type_strap and eeprom_size_strap[1:0] configuration straps

respectively. Various commands are supported for each EEPROM type, allowing for the storage and

retrieval of static data. The I2C interface conforms to the Philips I2C-Bus Specification.

The EEPROM Loader provides the automatic loading of configuration settings from the EEPROM into

the LAN9313/LAN9313i at reset, allowing the LAN9313/LAN9313i to operate unmanaged. The

EEPROM Loader module interfaces to the EEPROM Controller, Ethernet PHYs, and the system CSRs.

The SPI/I2C slave controller can be used for CPU serial management and allows CPU access to all

system CSRs. The SPI slave controller supports single register and multiple register read and write

commands. The I2C slave controller implements the low level I2C slave serial interface (start and stop

condition detection, data bit transmission/reception, and acknowledge generation/reception), handles

the slave command protocol, and performs system register reads and writes. The I2C slave controller

conforms to the Philips I2C-Bus Specification.

8.2

I2C/Microwire Master EEPROM Controller

Based on the configuration strap eeprom_type_strap, the I2C/Microwire EEPROM controller supports

either Microwire or I2C compatible EEPROMs. The I2C/Microwire serial management pins functionality

and characteristics differ dependant on the selected EEPROM type as summarized in Table 8.1.

Note:

When the EEPROM Loader is running, it has exclusive use of the I2C/Microwire EEPROM

controller. Refer to Section 8.2.4, "EEPROM Loader" for more information.

Table 8.1 I2C/Microwire Master Serial Management Pins Characteristics

EEPROM

TYPE/MODE

EE_SDA/EEDI PIN

EEDO PIN

EECS PIN

EE_SCL/EECLK PIN

I2C Master

EEPROM

Mode

eeprom_type_strap

= 1

EE_SDA

Input enabled

(to I2C master)

Open-drain output

(from I2C master)

Pull-down disabled

NOT USED

Input enabled

(used for straps)

Output enabled

(driven low)

NOT USED

Input enabled

(used for straps)

Output enabled

(driven low)

EE_SCL

Input enabled

(to I2C master and

used for straps)

Open-drain output

(from I2C master)

Microwire

Master

EEPROM

Mode

eeprom_type_strap

= 0

EEDI

Input enabled

(to Microwire master)

Output disabled

Pull-down enabled

EEDO

Input enabled

(used for straps)

Output enabled (from

Microwire master)

EECS

Input enabled

(used for straps)

Output enabled (from

Microwire master)

EECLK

Input enabled

(used for straps)

Output enabled (from

Microwire master)

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