Hi-Speed USB 2.0 to 10/100 Ethernet Controller

Datasheet

3.2EEPROM Defaults

The signature value of 0xA5 is stored at address 0. A different signature value indicates to the EEPROM controller that no EEPROM or an un-programmed EEPROM is attached to LAN9500/LAN9500i. In this case, the hardware default values are used, as shown in Table 3.3.

 

Table 3.3 EEPROM Defaults

 

 

 

FIELD

 

DEFAULT VALUE

 

 

 

MAC Address

 

FFFFFFFFFFFFh

 

 

 

Full-Speed Polling Interval (mS)

 

01h

 

 

 

Hi-Speed Polling Interval (mS)

 

04h

 

 

 

Configuration Flags

 

04h

 

 

 

Maximum Power (mA)

 

FAh

 

 

 

Vendor ID

 

0424h

 

 

 

Product ID

 

9500h

 

 

 

Note: The Configuration Flags are affected by the PWR_SEL and RMT_WKP straps.

3.3EEPROM Auto-Load

Certain system level resets (USB reset, POR, nRESET, and SRST) cause the EEPROM contents to be loaded into LAN9500/LAN9500i. After a reset, the EEPROM controller attempts to read the first byte of data from the EEPROM. If the value 0xA5 is read from the first address, then the EEPROM controller will assume that an external Serial EEPROM is present.

Note: The USB reset only loads the MAC address.

Revision 1.7 (10-02-08)

22

SMSC LAN9500/LAN9500i

 

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