VSC8221 datasheet(102/138 Pages) MICROSEMI

102 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

102 of 106

106

21E.15 - SFP MODE

SFP Mode (bit 15 =”1”) sets the following PHY defaults:

• TXDiS/SRESET is active high, i.e. behaves like TXDiS.

• MODDEF0/CLKOUT pin functions like MODDEF0, i.e this pin is asserted low by the PHY once the EEPROM interface is

released for access through the SMi interface.

• RXLOS/SiGDET pins functions like RXLOS.

• The SMi interface is set in MSA mode.

iEEE Mode (bit 15 = “0”) sets the following PHY defaults:

• TXDiS/SRESET is active low, i.e. behaves like SRESET.

• MODDEF0/CLKOUT pin functions like CLKOUT, i.e this pin drives out a 125MHz clock.

• RXLOS/SiGDET pin functions like SiGDET.

• The SMi interface is set in iEEE mode.

21E.14 - Re-Read EEPROM on Software Reset

When bit 21E.14 is set to a “1”, the contents of the EEPROM will be re-read and reloaded into the Mii registers upon software

reset.

21E.13 - EEPROM Access Enable

When bit 21E.13 is set to a “1”, the EEPROM address in bits 21E.10:0 is written to or read from, based on the state of bit

21E.12. The data to read/write resides in register 22E.

21E.12 - EEPROM Read/Write

When bit 21E.12 is set to a “1”, the VSC8221 will read from the EEPROM when bit 21E.13 is set. When bit 21E.12 is cleared,

the VSC8221 will write to the EEPROM when bit 21E.13 is set.

21E.11 - EEPROM Ready

When the VSC8221 is busy reading/writing to the EEPROM, bit 21E.11 will be cleared. Bit 21E.13 should not be set while bit

21E.11 is cleared.

21E.10:1 - EEPROM Address

These bits contain the EEPROM address that the VSC8221 will read from or write to when bit 21E.13 is set.

23.3.7 Register 22E (16h) - EEPROM Data Read/Write Register

22E.15:18 - EEPROM Read Data

After an EEPROM read has occurred by setting bits 21E.13 and 21E.12 to a “1”, the data read from the EEPROM is placed in

these bits.

Bit

Name

Access

States

Reset

Value

Sticky

15:8

EEPROM Read Data

8-bit data read from EEPROM

00000000

7:0

EEPROM Write Data

R/W

8-bit data to write to EEPROM

00000000

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