COM20020 datasheet(37/72 Pages) SMSC

Part #	COM20020

Description	COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM

PDF	72 Pages

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Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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37 / 72 page

BIT

BIT NAME

SYMBOL

DESCRIPTION

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.

COM20020 Datasheet(PDF) 37 Page - SMSC Corporation