LAN9500AI datasheet(40/66 Pages) SMSC

40 / 66 page

USB 2.0 to 10/100 Ethernet Controller

Datasheet

Revision 1.1 (04-18-13)

SMSC LAN950x Family

DATASHEET

5.5

Customized Operation Without EEPROM

Customized operation without EEPROM is supported only by LAN9500A/LAN9500Ai.

The device provides the capability to customize operation without the use of an EEPROM. Descriptor

information and initialization quantities normally fetched from EEPROM and used to initialize

descriptors and elements of the System Control and Status Registers may be specified via an alternate

mechanism. This alternate mechanism involves the use of the Descriptor RAM in conjunction with the

Attribute Registers and select elements of the System Control and Status Registers. The software

device driver orchestrates the process by performing the following actions in the order indicated:



Initialization of System Control and Status Register Elements in Lieu of EEPROM Load



Attribute Register Initialization



Descriptor RAM Initialization



Enable Descriptor RAM and Flag Attribute Registers as Source



Inhibit Reset of Select System Control and Status Register Elements

LAN9500AI 数据表(PDF) 40 Page - SMSC Corporation