COM20020IP3V datasheet(44/82 Pages) SMSC

44 / 82 page

DISCONTINUED DATASHEET

BIT

BIT NAME

SYMBOL

DESCRIPTION

Enhanced

Functions

This bit is used to enable the new enhanced functions in the

COM20020. EF = 0: Disable (Default), EF = 1: Enable. If EF

= 0, the timing and function is the same as in the

COM20020, Revision B. See appendix “A”. EF bit must be

‘1’ if the data rate is over 5Mbps.

EF bit should be ‘1’ for new design customers.

EF bit should be ‘0’ for replacement customers.

No Synchronous

NOSYNC

This bit is used to enable the SYNC command during

initialization. NOSYNC= 0, Enable (Default) The line must

be idle for the RAM initialization sequence to be written.

NOSYNC= 1, Disable:) The line does not have to be idle for

the RAM initialization sequence to be written. See appendix

“A”.

1,0

Reconfiguration

Timer 1, 0

RCNTM1,0 These bits are used to program the reconfiguration timer as a

function of maximum node count. These bits set the time out

period of the reconfiguration timer as shown below. The

time out periods shown are for 5 Mbps.

RCNTM1

RCNTM0

Time Out

Period

Max Node Count

420 mS

Up to 255 nodes

105 mS

Up to 64 nodes

52.5 mS

Up to 32 nodes

26.25 mS*

Up to 16 nodes

Note*: The node ID value 255 must exist in the network for

26.25 mS timeout to be valid.

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