COM20020 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

MFG CO.

COM20020

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

SMSC -> Microchip 

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ADDRESS

0

1

2

COUNT

255

511

SHORT PACKET

FORMAT

SID

DID

COUNT = 256-N

NOT USED

DATA BYTE 1

DATA BYTE 2

DATA BYTE N-1

DATA BYTE N

NOT USED

ADDRESS

0

1

2

3

COUNT

511

LONG PACKET

FORMAT

SID

DID

0

COUNT = 512-N

NOT USED

DATA BYTE 1

DATA BYTE 2

DATA BYTE N-1

DATA BYTE N

N = DATA PACKET LENGTH

SID = SOURCE ID

DID = DESTINATION ID

(DID = 0 FOR BROADCASTS)

FIGURE 9 - RAM BUFFER PACKET CONFIGURATION

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