ML6691 datasheet(3/10 Pages) MICRO-LINEAR

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ML6691

PIN DESCRIPTION (Continued)

PIN#

NAME

FUNCTION

RXCLK

Receive clock output. Continuous

25 MHz clock provides the timing

reference for the transfer of RXDV,

RXER, and RXD[3:0] to the MAC.

DCFR

Scrambler/descrambler disable. A

logic high on this input disables the

Stream Cipher scrambler/descrambler.

GND

Ground

LOCAL

Local/remote. A logic low on this input

places the ML6691 in remote mode, in

which the MII interface is disabled at

power on or after a reset operation.

When low, the isolate bit of the

Control register will be set upon power

up or reset.

RST

Reset. A logic high on this input resets

the Status and Control registers to their

default states.

Chip select. A logic low is generated

on this output when the ML6691

detects an address match.

LPBK

Loopback. A logic low on this output

indicates the loopback function.

RXC

Receive symbol clock. A 25 MHz

clock input from the PMD layer. The

rising edge of RXC is used to sample

RSM[4:0].

PIN#

NAME

FUNCTION

29-33

RSM[4:0] Receive symbol data inputs. Symbol-

wide (encoded) data from the PMD

layer.

Signal detect. A logic high on this

input indicates the presence of non-

quiet data. The internal signal, linkfail,

is enabled 330

µs after SD is asserted.

35-39

TSM[4:0] Transmit symbol data outputs. Symbol-

wide (encoded) data for transfer to the

PMD layer.

TXC

Transmit symbol clock input. Input

used to generate TXCLK. Use either a

25 MHz crystal or a 25 MHz clock

between TXC input and GND.

MDIO

Management data input/output. A

bi-directional signal used to transfer

control and status information

between the ML6691 and the MAC.

MDIO is synchronous to MDC.

MDC

Management data clock input. A low-

frequency aperiodic clock used as the

timing reference for transfer of

information on the MDIO signal.

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