AX88780 datasheet(16/55 Pages) ASIX

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AX88780

ASIX ELECTRONICS CORPORATION

3.11 EEPROM Format

AX88780 will auto-load data from EEPROM device after hardware reset. If the EEPROM device is not attached, the

loading operation will be discarded. The EEPROM mainly provides MAC address information and CIS information if it is

used in PCMCIA environment. Below table is the format if EEPROM device is employed. Note: If the MAC address is 12

34 56 78 9A BC (MSB-LSB) then driver should set MACID0=0x9ABC, MACID1=0x5678 and MACID2=0x1234.

Address

Description

Pointer to CIS area starting address. Set this field to 0x0070 to shorten the download EEPROM if there is

no CIS needed. AX88780 only supports 93C56-16bit mode, thus the max value of this field is 0x007F. This

field should not be set to 0x0000 or 0xFFFF; otherwise, AX88780 will not recognize the EEPROM during

hardware reset.

MACID0 data

MACID1 data

MACID2 data

Reserved, keep all 0’s

Bit0: When LINKLED is set to ‘1’ in reset stage, this bit indicates AX88780 whether or not it is in the

environment of PCMCIA.

0 = General 16-bit mode,

1= Special for PCMCIA environment of 16-bit mode.

Bit1: 0 = Use external PHY,

1 = Use internal PHY. This function is independent from PHY_EN bit of PHY_CTRL register. Either

of both is set will force AX88780 to select internal PHY.

Others bit set to 0s for normal operation

6 ~ 11

Reserved, keep all 0’s

12 ~ 127

CIS area, if it used in PCMCIA system, otherwise don’t care these fields

AX88780 Datasheet(PDF) 16 Page - ASIX Electronics Corporation