SMSC COM20020 manual RAM Buffer Packet Configuration

	SHORT PACKET
ADDRESS	FORMAT	ADDRESS
0	SID	0
1	DID	1
2	COUNT = 256-N	2
	NOT USED	3
COUNT
	DATA BYTE 1
	DATA BYTE 2
		COUNT
	DATA BYTE N-1
255	DATA BYTE N
	NOT USED
511		511

N = DATA PACKET LENGTH

SID = SOURCE ID

DID = DESTINATION ID

(DID = 0 FOR BROADCASTS)

LONG PACKET

FORMAT

SID

DID

0

COUNT = 512-N

NOT USED

DATA BYTE 1

DATA BYTE 2

DATA BYTE N-1

DATA BYTE N

FIGURE 8 - RAM BUFFER PACKET CONFIGURATION

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