
U.S.
Patent
Jun.
19,
2007
Sheet
7
0f
19
US
7,233,601
B1
12
40
Q Q
80
81
82
a
‘
T51
RX
a
6X
7
TX
L
SERDES
‘
)
RX
'
r
‘
ControlOUT
L
ControllN
83M
BusVcc
‘
$\ll
MDC
‘
Cascade
Numbering
‘
MDIO
_
and
Status
‘
' message
S
TX
and
Rx
'8 84
A/
85
88
I.\T
S
BusVcc
89
2
R6
FIG.8
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