AX88796BLF datasheet(28/82 Pages) ASIX

28 / 82 page

ASIX ELECTRONICS CORPORATION

AX88796BLF / AX88796BLI

4.7 EEPROM Interface

AX88796B can optionally load its MAC address from an external serial EEPROM. If a properly configured

EEPROM is detected by AX88796B at power-up, hard reset or host set a reload EEPROM request (CR page3 offset

0Ch), the constants of EEPROM data will be auto loading to internal memory from 0000h to 001Fh and from 0400h

to 040Fh automatically. It is similar NE2000 PROM store MAC address field. A detailed explanation of the

EEPROM data format in section 3.1 “EEPROM Memory Mapping”. After auto load EEPROM completed not

indicate AX88796B knew its MAC address. Host driver can get MAC address from internal memory (0000h ~

001Fh) or (0400h ~ 040Fh) and write “Physical Address Registers” (CR page1 offset 01h ~ 06h).

The AX88796B EEPROM use 3 PIN to connect to a most “93C46” type EEPROM configured for x16-bit operation.

A connect diagram as below

Fig - 7 EEPROM connections

After EEPROM loader has finished reading the MAC after power-on, hard reset or host set a reload EEPROM

request (CR page3 offset 0Ch), the Host is free to perform EECS, EECK and EEDIO as General Purpose I/O pin.

4.8 Power management

AX88796B supports power-down modes to allow applications to minimize power consumption. There is one

normal operation power state, D0 and there are two power saving states: D1, and D2. The “Power Management

supports Wake on LAN function. In D2 power saving state, AX88796B will off all function block and clocks to

minimize power consumption. After wakeup event, the “Power Management Register” will be cleared and state at

normal operation power state. When AX88796B in either D1 or D2 power saving mode, host can write “Host Wake

Up Register” (Offset 1Fh) return the AX88796B to the D0 state. Power is reduced to various modules by disabling

the clocks as outlined in table as below.

AX88796B

BLOCK

(Normal

operation)

(WOL)

Internal

clock

Off

MAC and

Host

Off

MAC power

management

Rx Block

Off

PHY

Off

Tab - 12 Power Management Statuses

EECS

EECK

EEDIO

AX88796B

EECS

EECK

EEDI

EEDO

93C46

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