LAN9311 Datasheet, PDF (138/461 Pages) SMSC Corporation – Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
Datasheet
Chapter 10 Serial Management
10.1
Functional Overview
This chapter details the LAN9311/LAN9311i serial management functionality of the I²C/Microwire
EEPROM Controller and the supporting EEPROM Loader.
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 LAN9311/LAN9311i at reset. The EEPROM Loader module interfaces to the EEPROM Controller,
Ethernet PHYs, and the system CSRs.
10.2
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 10.1.
Table 10.1 I²C/Microwire Master Serial Management Pins Characteristics
EEPROM
TYPE/MODE
I²C Master
EEPROM
Mode
eeprom_type_strap
=1
Microwire
Master
EEPROM
Mode
eeprom_type_strap
=0
EE_SDA/EEDI PIN
EE_SDA
Input enabled
(to I²C master)
Open-drain output
(from I²C master)
Pull-down disabled
EEDI
Input enabled
(to Microwire master)
Output disabled
Pull-down enabled
EEDO PIN
NOT USED
Input enabled
(used for straps)
Output enabled
(driven low)
EEDO
Input enabled
(used for straps)
Output enabled (from
Microwire master)
EECS PIN
NOT USED
Input enabled
(used for straps)
Output enabled
(driven low)
EECS
Input enabled
(used for straps)
Output enabled (from
Microwire master)
EE_SCL/EECLK PIN
EE_SCL
Input enabled
(to I²C master and
used for straps)
Open-drain output
(from I²C master)
EECLK
Input enabled
(used for straps)
Output enabled (from
Microwire master)
Note: When the EEPROM Loader is running, it has exclusive use of the I²C/Microwire EEPROM
controller. Refer to Section 10.2.4, "EEPROM Loader" for more information.
Revision 2.0 (02-14-13)
138
DATASHEET
SMSC LAN9311/LAN9311i