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LAN9312 Datasheet(PDF) 137 Page - SMSC Corporation |
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LAN9312 Datasheet(HTML) 137 Page - SMSC Corporation |
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137 / 458 page  High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface Datasheet SMSC LAN9312 137 Revision 1.2 (04-08-08) DATASHEET Chapter 10 Serial Management 10.1 Functional Overview This chapter details the LAN9312 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 LAN9312 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. 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. Table 10.1 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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