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Advanced 10/100 Unmanaged Repeater — LXT9883/9863

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

3.7.2

10M-Only Operation

3.7.2.1

MAC IRB Access

The MACACTIVE pin allows an external MAC or other digital ASIC to interface directly to the

10 Mbps IRB. When the MACACTIVE pin is asserted, the LXT98x3 drives the IR10CFS and

IR10CFSBP signals on behalf of the external device, allowing it to participate in collision detection

functions.

3.7.3

LXT98x/91x/98xx Compatibility

The LXT98x3 devices feature low-power 3.3V design. The LXT98x and LXT91x devices operate

at 5V and are incompatible with the LXT98x3 devices in cascades. The LXT98x3 devices,

however, are backwards stackable with LXT98x and LXT91x repeaters.

Refer to "Inter-Repeater Backplane Compatibility” on page 41..

Figure 7. 100M IRB Connection

IR100DAT(4:0)

IR100DV

IR100CLK

IR100CFS

IR100DAT(4:0)

IR100DV

IR100CLK

IR100CFSBP

HUB #1

HUB #2

IR100DEN

IR100SNGL

IR100COL

IR100CFS

IR100SNGL

IR100COL

LXT98x3

(0)

LXT98x3

(0)

LXT98x3

Cascade

Stack

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