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COM20020ILJP датащи(PDF) 42 Page - Microchip Technology

номер детали COM20020ILJP
подробное описание детали  5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
PDF  72 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

COM20020ILJP датащи(HTML) 42 Page - Microchip Technology

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5Mbps ARCNET (ANSI 878.1) Controller with 2K x 8 On-Chip RAM
Datasheet
Revision 12-05-06
Page 42
SMSC COM20020I Rev D
DATASHEET
SID
DID
COUNT = 256-N
NOT USED
DATA BYTE 1
DATA BYTE 2
DATA BYTE N-1
DATA BYTE N
NOT USED
SID
DID
0
COUNT = 512-N
NOT USED
DATA BYTE 1
DATA BYTE 2
DATA BYTE N-1
DATA BYTE N
SHORT PACKET
FORMAT
LONG PACKET
FORMAT
ADDRESS
ADDRESS
0
1
2
COUNT
255
511
N = DATA PACKET LENGTH
SID = SOURCE ID
DID = DESTINATION ID
(DID = 0 FOR BROADCASTS)
0
1
2
COUNT
511
3
Figure 6.2 - RAM Buffer Packet Configuration
6.4.2
Transmit Sequence
During a transmit sequence, the microcontroller selects a 256 or 512 byte segment of the RAM buffer and
writes into it. The appropriate buffer size is specified in the "Define Configuration" command. When long
packets are enabled, the COM20020ID interprets the packet as either a long or short packet, depending
on whether the buffer address 2 contains a zero or non-zero value. The format of the buffer is shown in
Figure 6.2. Address 0 contains the Source Identifier (SID); Address 1 contains the Destination Identifier
(DID); Address 2 (COUNT) contains, for short packets, the value 256-N, where N represents the number
of information bytes in the message, or for long packets, the value 0, indicating that it is indeed a long
packet. In the latter case, Address 3 (COUNT) would contain the value 512-N, where N represents the



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