COM20020_00 datasheet(7/82 Pages) SMSC

Part #	COM20020

Description	Universal Local Area Network Controller with 2K x 8 On-Board RAM

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Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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7

Invitation

to Transmit to

this ID?

Y

N

Free Buffer

Enquiry to

this ID?

SOH?

YN

RI?

Write SID

to Buffer

DID

=0?

DID

=ID?

Write Buffer

with Packet

CRC

OK?

LENGTH

OK?

DID

=0?

DID

=ID?

SEND ACK

N

Y

N

Y

N

Y

N

Broadcast

Enabled?

N

Y

N

No Activity

for 41

uS?

Y

N

Set NID=ID

Start Timer:

T=(255-ID)

Activity

On Line?

Y

N

T=0?

Set RI

RI?

Transmit

NAK

Transmit

ACK

Set NID=ID

Write ID to

RAM Buffer

Send

Reconfigure

Burst

Power On

Reconfigure

Timer has

Timed Out

Start

Reconfiguration

Timer (420 mS)*

TA?

Broadcast?

Transmit

Free Buffer

Enquiry

No

Activity

Read Node ID

FIGURE 1 - COM20020 OPERATION

Pass the

Token

Set TA

Y

N

ACK?

NAK?

1

No

Activity

N

Y

Increment

NID

Send

Packet

Was Packet

Broadcast?

No

Activity

N

ACK?

Set TMA

Set TA

x 73 us

for 37.4

us?

for 37.4

us?

for 37.4

us?

Y

N

Y

N

Y

N

1

Y

N

Y

ID refers to the identification number of the ID assigned to this node.

NID refers to the next identification number that receives the token

after this ID passes it.

-

SID refers to the source identification.

DID refers to the destination identification.

SOH refers to the start of header character; preceeds all data packets.

-

YN

* Reconfig timer is programmable via setup2 register bits 1, 0.

Note - All time values are valid for 5 Mbps.

Similar Part No. - COM20020_00

Manufacturer	Part #	Datasheet	Description
SMSC Corporation	COM20020-5	250Kb / 58P	Universal Local Area Network Controller with 2K x 8 On-Board RAM
	COM20020D	241Kb / 72P	ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM
	COM20020I	415Kb / 72P	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
	COM20020I	480Kb / 65P	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
	COM20020I	478Kb / 69P	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

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Similar Description - COM20020_00

Manufacturer	Part #	Datasheet	Description
SMSC Corporation	COM20020-5	250Kb / 58P	Universal Local Area Network Controller with 2K x 8 On-Board RAM
	COM20020	340Kb / 72P	COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM
	COM20020D	241Kb / 72P	ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM
	COM20019I	505Kb / 65P	Low Cost ARCNET(ANSI 878.1) Controller with 2k X 8 On-Board RAM
	COM20019	454Kb / 81P	Low Cost ARCNET (ANSI 878.1) Controller with 2K x 8 On-Board RAM
	COM20019I	392Kb / 65P	Low Cost ARCNET (ANSI 878.1) Controller with 2K x 8 On-Board RAM
Stanford Microdevices	COM9026	1Mb / 12P	LOCAL AREA NETWORK CONTROLLER LANC-TM
SMSC Corporation	COM20020I_0609	478Kb / 69P	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
	COM20020I	480Kb / 65P	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
	COM20020I	415Kb / 72P	5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM

More results

COM20020 Datasheet(PDF) 7 Page - SMSC Corporation

COM20020 Datasheet(HTML) 7 Page - SMSC Corporation

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Similar Description - COM20020_00

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