DNC3X3825 datasheet(7/32 Pages) AGERE

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Advance Data Sheet

DNC3X3825

March 2000

Octal 10/100 Mbits/s Ethernet Transceiver Macrocell

Signal Information (continued)

Table 2. MII Management Signals

Table 3. 10/100 Mbits/s Twisted-Pair (TP) Interface Signals

Signal

Type

Name/Description

MDC

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.

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.

MDIO_IN

Management Data Input. Control information is driven by the station manage-

ment, synchronous with MDC, onto this input.

MDIO_OUT

Management Data Output. Status information is driven by the DNC3X3825,

synchronous with MDC, onto this output.

MDIO_HI_Z

Management Data Output Enable. When high, this signal can be used to

3-state the MDIO bidirectional buffer (external to the DNC3X3825).

INT_MASK[7:0]

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].

INT_R31[7:0]

Maskable Status Interrupt. This signal will go high whenever there is a change

in status as defined in Table 27.

Signal

Type

Name/Description

TPI

[7:0]

PADI

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.

TPIB

[7:0]

PADI

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.

TPO

[7:0]

PADO

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.

TPOB

[7:0]

PADO

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.

REXT10

PADO

Current Setting 10 Mbits/s. An external resistor (21.0 k

Ω) is placed from this

signal to ground to set the 10 Mbits/s TP driver transmit output level.

REXT100

PADO

Current Setting 100 Mbits/s. An external resistor (21.5 k

Ω) is placed from this

signal to ground to set the 100 Mbits/s TP driver transmit output level.

REXTBS

PADO

Band Gap Reference for the Receive Channel. Connect this signal to a

24.9 k

Ω ± 1% resistor to ground. The parasitic load capacitance should be less

than 15 pF.

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