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Advanced 10/100 Unmanaged Repeater — LXT9883/9863

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

3.4

Repeater Operation

The LXT98x3 contains two internal repeater state machines — one operating at 10 Mbps and the

other at 100 Mbps. The LXT98x3 automatically switches each port to the correct repeater, once the

operational state of that port has been determined. Each repeater connects all ports configured to

the same speed (including the MII), and the corresponding Inter-Repeater Backplane. Both

repeaters perform the standard jabber and partition functions.

3.4.1

100 Mbps Repeater Operation

The LXT98x3 contains a complete 100 Mbps Repeater State Machine (100RSM) that is fully IEEE

802.3 Class II compliant. Any port configured for 100 Mbps operation is automatically connected

to the 100 Mbps Repeater. This includes any of the eight media and two MII ports configured for

100 Mbps operation.

The 100 Mbps RSM has its own Inter-Repeater Backplane (100IRB). Multiple LXT98x3s can be

cascaded on the 100IRB and operate as one repeater segment. Data from any port is forwarded to

all other ports in the cascade. The 100IRB is a 5-bit symbol-mode interface. It is designed to be

stackable.

The LXT98x3 performs the following 100 Mbps repeater functions:

• Signal amplification, wave-shape restoration, and data-frame forwarding.

• SOP, SOJ, EOP, EOJ delay < 46BT; class II compliant.

• Collision Enforcement. During a 100 Mbps collision, the LXT98x3 drives a 0101 jam signal

(encoded as Data 5 on TX links) to all ports until the collision ends. There is no minimum

enforcement time.

• Partition. The LXT98x3 partitions any port that participates in excess of 60 consecutive

collisions or one long collision approximately 575.2

µs long. Once partitioned, the LXT98x3

monitors and transmits to the port, but does not repeat data received from the port until it un-

partitions.

Figure 4. MII Interface

MAC

TXD(3:0)

TXEN

TXER

TXCLK

RXCLK

LXT98x3

RXD(3:0)

RX_DV

RX_ER

CRS

COL

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