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TC3097-8

Lite End Multiport Repeater Interface Controller

Unspecified 

TC3097-8

Preliminary Data Sheet

2 Principles Of Operation

2.1 Reset

The LEMRIC resets when XRESETZ (pin 25) is pulsed low. While reset, the LEMRIC ignores all energy

and collision inputs, unjabs all ports, and initializes all timers, counters, and state machines. At the end of

reset (XRESETZ goes high), all the LEDs are turned off and the XLRLED1 is turned on.

The minimum XRESETZ low pulse is one second to let the power on LED test visually distinguishable.

The LEMRIC is fully operational when it exits reset.

2.2 Clock and data Recovery

The clock and data recovery circuit (Manchester decoder) is a linear circuit, which it recovers the NRZ

data and clock from the Manchester encoded serial data stream. Data from the active port is routed to

the decoder and the recovered data is written into the FIFO.

10 1 0 0 11 0 1 0 1 1

Manchester

Data

NRZ

Data

NRZ

Clock

Figure 1. Manchester Data - NRZ Data Relationship

Confidential.

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Copyright © 2003, IC Plus Corp.

July 21. 2003

TC3097-8-DS-R24

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