VSC8221 datasheet(58/138 Pages) MICROSEMI

tên linh kiện	VSC8221

Giải thích chi tiết về linh kiện	Single Port 10/100/1000BASE-T PHY with1.25 Gbps SerDes for SFPs/GBICs

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

58 of 60

Figure 21. EEPROM interface Connections

NOTE: The same clock must be used for each VSC8221's REFCLK input. in addition, the RESET pin for each VSC8221 must

be driven from the same source to ensure that the reference clock modes within each device are correctly set.

This prevents using the CLKOUT or CLKOUTMiCRO output from one VSC8221 to drive the clock input of another VSC8221, if

the devices are sharing the same EEPROM.

Table 28. Configuration EEPROM Data Format

Address

Contents

-------------

----------------------------------------------------

-------------

----------------------------------------------------

-------------

----------------------------------------------------

-------------

----------------------------------------------------

O+7

Data to be written (LSB)

O+6

Data to be written (MSB)

O+5

RegAddress b

O+4

Data to be written (LSB)

O+3

Data to be written (MSB)

EEPROM

VSC8221

(1)

VSC8221

(2)

REFCLK

Source

RESET

Source

SCL

SDA

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