DNC3X3625 Ver la hoja de datos (PDF) - Agere -> LSI Corporation
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DNC3X3625 Datasheet PDF : 32 Pages
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Advance Data Sheet
March 2000
DNC3X3625
10/100 Mbits/s Ethernet Transceiver Macrocell
Signal Information (continued)
Table 2. MII Management Signals
Signal
MDC
Type
I
Name/Description
Management Data Clock. This is the timing reference for the transfer of data
on the MDIO signal. This signal may be asynchronous to MRXCLK and
MTXCLK. The maximum clock rate is 12.5 MHz.
MDIO_IN
MDIO_OUT
MDIO_HI_Z
INT_MASK[5:0]
INT_R31[5:0]
When running MDC above 6.25 MHz, MDC must be synchronous with
CLK25RAW and have a setup time of 15 ns and a hold time of 5 ns with respect
to CLK25RAW.
I
Management Data Input. Control information is driven by the station manage-
ment, synchronous with MDC, onto this input.
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O Management Data Output. Status information is driven by the DNC3X3625,
synchronous with MDC, onto this output.
O Management Data Output Enable. When high, this signal can be used to
3-state the MDIO bidirectional buffer (external to the DNC3X3625).
I Interrupt Mask. When set high, no interrupt is generated under any condition.
When set low, interrupts are generated according to bit [31.7]. This signal is
ORed with bit [31.6].
O Maskable Status Interrupt. This signal will go high whenever there is a change
in status as defined in Table 27.
Table 3. 10/100 Mbits/s Twisted-Pair (TP) Interface Signals
Signal
TPI
[5:0]
TPIB
[5:0]
TPO
[5:0]
TPOB
[5:0]
REXT10
REXT100
REXTBS
Type
PADI
PADI
PADO
PADO
PADO
PADO
PADO
Name/Description
Received Data. Positive differential received 125 Mbaud MLT3 or 10 Mbaud
Manchester data from magnetics.
Fiber-Optic Data Input. Positive differential received 125 Mbaud pseudo-ECL
data from fiber transceiver.
Received Data. Negative differential received 125 Mbaud MLT3 or 10 Mbaud
Manchester data from magnetics.
Fiber-Optic Data Input. Negative differential received 125 Mbaud pseudo-ECL
data from fiber transceiver.
Transmit Data. Positive differential transmit 125 Mbaud MLT3 or 10 Mbaud
Manchester data to magnetics.
Fiber-Optic Data Output. Positive differential transmit 125 Mbaud pseudo-ECL
compatible data to fiber transceiver.
Transmit Data. Negative differential transmit 125 Mbaud MLT3 or 10 Mbaud
Manchester data to magnetics.
Fiber-Optic Data Output. Negative differential transmit 125 Mbaud pseudo-
ECL compatible data to fiber transceiver.
Current Setting 10 Mbits/s. An external resistor (21.0 kΩ) is placed from this
signal to ground to set the 10 Mbits/s TP driver transmit output level.
Current Setting 100 Mbits/s. An external resistor (21.5 kΩ) is placed from this
signal to ground to set the 100 Mbits/s TP driver transmit output level.
Band Gap Reference for the Receive Channel. Connect this signal to a
24.9 kΩ ± 1% resistor to ground. The parasitic load capacitance should be less
than 15 pF.
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