VSC8221XHH datasheet(20/138 Pages) MICROSEMI

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

20 of 26

Table 8. Serial Management interface Signals

100 TFBGA

BALL

Signal Name

Type

Description

J10

MODDEF1/

MDC

The Functionality of this pin is determined by the value of Mii Register 21E.15

‘SFP MODE’ set at startup using CMODE Hardware Configuration or via the

EEPROM interface.

MODDEF1 - Serial MSA Clock (valid in SFP Mode, when Mii Register 21E.15

= 1).

MODDEF1 is the clock input of the two-wire serial interface for accessing the

PHY’s registers or the EEPROM connected to the EEPROM interface using the

protocol specified in the MSA specification. Although typically operated at

100kHz, MODDEF1 can be operated at a maximum of 1MHz.

MDC - Management Data Clock (valid in iEEE Mode, when Mii Register

21E.15 = 0).

MDC is the clock input of the two wire serial interface for accessing the PHY’s

registers or the EEPROM connected to the EEPROM interface using the Serial

Management interface protocol specified in the iEEE 802.3 specification.

Although typically operated at less than 100kHz due to frequency limitations of

the EEPROM used with the PHY, the PHY registers can be accessed at a

maximum frequency of 1MHz.

MODDEF2/

MDiO

i/O

The Functionality of this pin is determined by the value of Mii Register 21E.15

‘SFP MODE’ set at startup using CMODE Hardware Configuration or via the

EEPROM interface.

MODDEF2 - Serial i/O Data (valid in SFP Mode, when Mii Register 21E.15 =

1).

MODDEF2 is the data line of the two-wire serial interface for accessing the PHY’s

registers or the EEPROM connected to the EEPROM interface using the protocol

specified in the MSA specification. This pin normally requires a 1.5k

Ω to 4.7kΩ

pull-up resistor to VDDiOMiCRO at the Station Manager. The value of the pull-up

resistor depends on the MODDEF1 frequency and the capacitive load on the

MODDEF2 line.

MDiO - Serial i/OP Data (valid in iEEE Mode, when Mii Register 21E.15 = 0).

MDiO is the data line of the two-wire serial interface for accessing the PHY’s

registers or the EEPROM connected to the EEPROM interface using the Serial

Management interface protocol specified in the iEEE 802.3 specification. This pin

normally requires a 1.5k

Ω to 4.7kΩ pull-up resistor to VDDiOMiCRO at the

Station Manager. The value of the pull-up resistor depends on the MDC

frequency and the capacitive load on the MDiO line.

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