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Networking Silicon —
82546EB
Datasheet
15
3.7
Serializer / Deserializer Signals
3.8
JTAG Test Interface Signals
MDIB[1]+/-
A
Media Dependent Interface B [1].
1000BASE-T
: In MDI configuration, MDIB[1]+/- corresponds to BI_DB+/-, and in MDI-X
configuration, MDIB[1]+/- corresponds to BI_DA+/-.
100BASE-TX
: In MDI configuration, MDIB[1]+/- is used for the receive pair, and in MDI-X
configuration, MDIB[1]+/- is used for the transit pair.
10BASE-T
: In MDI configuration, MDIB[1]+/- is used for the receive pair, and in MDI-X
configuration, MDIB[1]+/- is used for the transit pair.
MDIB[2]+/-
A
Media Dependent Interface B [2].
1000BASE-T
: In MDI configuration, MDIB[2]+/- corresponds to BI_DC+/-, and in MDI-X
configuration, MDIB[2]+/- corresponds to BI_DD+/-.
100BASE-TX
: Unused.
10BASE-T
: Unused.
MDIB[3]+/-
A
Media Dependent Interface B [3].
1000BASE-T
: In MDI configuration, MDIB[3]+/- corresponds to BI_DD+/-, and in MDI-X
configuration, MDIB[3]+/- corresponds to BI_DC+/-.
100BASE-TX
: Unused.
10BASE-T
: Unused.
Symbol
Type
Name and Function
RXA+/-
RXB +/-
I
SERDES Receive Pairs A and B.
These signals make the differential receive pair for
the 1.25 GHz serial interface. If the SERDES interface is not used, these pins should
not be connected.
TXA+/-
TXB +/-
O
SERDES Transmit Pairs A and B.
These signals make the differential transmit pair for
the 1.25 GHz serial interface. If the SERDES interface is not used, these pins should
not be connected.
SIG_
DETECT
(A and B)
I
Signal Detects A and B.
These pins indicate whether the SERDES signals
(connected to the 1.25 GHz serial interface) have been detected by the optical
transceivers. If the SERDES interface is not used, the SIG_DETECT inputs should be
connected to ground using pull-down resistors.
Symbol
Type
Name and Function
JTAG_TCK
I
JTAG Clock.
JTAG_TDI
I
JTAG TDI.
JTAG_TDO
O
JTAG TDO.
JTAG_TMS
I
JTAG TMS.
Symbol
Type
Name and Function