ML6652CH datasheet(16/28 Pages) MICRO-LINEAR

16 / 28 page

ML6652

January 2002

Preliminary Datasheet

OPERATING MODES

Operating Modes are:

1) Forced 10

0 (zero) Volt input on SPEED (or the equivalent Reg.

30 settings) enables only FORCED 10Mbps operation.

100Mbps and Auto-Negotiation are disabled. Link

Integrity Warning (LIW) can also be enabled.

2) Forced 100

VCC input on SPEED (or the equivalent Reg. 30

settings) enables FORCED 100Mbps operation only.

10Mbps and Auto-Negotiation are disabled. Link

Integrity Warning (LIW) can also be enabled.

3) Non-Transparent Half-DUPLEX

VCC/2 (input floating) input on SPEED (or the

equivalent Reg. 30 settings) enables Transparent or

non-transparent 10Mbps and 100Mbps operation.

DUPLEX input (0 Volts at power up) or management

operation and force Half-DUPLEX. Non-transparent

mode was designed for networks that have Auto-

Negotiation capabilities only on the copper side. The

ML6652 operates in Non-Transparent Mode when all

of the following four conditions are met:

Duplex input is a VCC or a 0 Volts (or the

equivalent Reg. 30 settings) AND

Twisted Pair Link is Auto-Negotiation capable

AND

Fiber Optic Link Partner is not Auto-Negotiation

capable AND

Both 10Mbps and 100Mbps operation are enabled

by SPEED input at VCC/2 or by bits in

management register 30.

In this mode, the twisted pair output is disabled until

signal is detected at both the twisted pair and the fiber

optic inputs. The fiber optic output is not disabled, and it

shows the input signal from the twisted pair interface

converted to the equivalent fiber optic technology.

When the TP link partner negotiates the link through the

Auto-Negotiation protocol and FLP bursts reach the

ML6652 operating in the Non-Transparent mode, the

ML6652 will start generating its own FLP Bursts

advertising the speed detected at the FO input and the

DUPLEX mode selected through the DUPLEX pin or

through the management interface bits 30.15 and 30.10

The ML6652 will transmit FLP Bursts as long as it receives

FLP Bursts from the TP link partner. (The decision that the

link is settled will be made by the TP link partner.)

Note 1: In Non-Transparent Half Duplex Mode, only the

Half Duplex mode of operation is advertised through the

Auto Negotiation protocol. However nothing changes

inside the ML6652, the transmit and receive paths are

completely separate and are always capable of

simultaneous or full duplex use.

Note 2: SPEED and DUPLEX modes are the only abilities

advertised in this mode by the ML6652

Note 3: Link Integrity Warning (LIW) can not be enabled

in this mode.

4) Non-Transparent

VCC/2 (input floating) input on SPEED (or the

equivalent Reg. 30 settings) enables Transparent or

non-transparent 10Mbps and 100Mbps operation.

DUPLEX input (VCC at power up) or management

operation. Non-transparent mode was designed for

networks that have Auto-Negotiation capabilities only

on the copper side. The ML6652 operates in Non-

Transparent Mode when all of the following four

conditions are met:

Duplex input is a VCC or a 0 Volts (or the

equivalent Reg. 30 settings) AND

Twisted Pair Link is Auto-Negotiation capable

AND

Fiber Optic Link Partner is not Auto-Negotiation

capable AND

Both 10Mbps and 100Mbps operation are enabled

by SPEED input at VCC/2 or by bits in

management register 30.

In this mode, the twisted pair output is disabled until

signal is detected at both the twisted pair and the fiber

optic inputs. The fiber optic output is not disabled, and it

shows the input signal from the twisted pair interface

converted to the equivalent fiber optic technology.

When the TP link partner negotiates the link through the

Auto-Negotiation protocol and FLP bursts reach the

ML6652 operating in the Non-Transparent mode, the

ML6652 will start generating its own FLP Bursts

advertising the speed detected at the FO input and the

DUPLEX mode selected through the DUPLEX pin or

through the management interface bits 30.15 and 30.10

The ML6652 will transmit FLP Bursts as long as it receives

FLP Bursts from the TP link partner. (The decision that the

link is settled will be made by the TP link partner.)

Note 1: SPEED and DUPLEX modes are the only abilities

advertises in this mode by the ML6652

Note 2: Link Integrity Warning (LIW) can not be enabled

in this mode.

5) Transparent

VCC/2 (input floating) input on SPEED (or the

equivalent Reg. 30 settings) enables Transparent or

non-transparent 10Mbps and 100Mbps operation.

DUPLEX input and management register 30 select

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