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COM20020IP3V 数据表(PDF) 11 Page - SMSC Corporation

部件名 COM20020IP3V
功能描述  COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM
PDF  72 Pages
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制造商  SMSC [SMSC Corporation]
网页  http://www.smsc.com
标志 SMSC - SMSC Corporation

COM20020IP3V 数据表(HTML) 11 Page - SMSC Corporation

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11
is defined as no line activity and a logic "1" is
defined as a negative pulse of 100nS duration. A
transmission starts with an ALERT BURST
consisting of 6 unit intervals of mark (logic "1").
Eight bit data characters are then sent, with each
character preceded by 2 unit intervals of mark and
one unit interval of space.
Five types of
transmission can be performed as described
below:
Invitations To Transmit
An Invitation To Transmit is used to pass the
token from one node to another and is sent by the
following sequence:
# An ALERT BURST
# An EOT (End Of Transmission: ASCII code
04H)
#
Two
(repeated)
DID
(Destination
ID)
characters
ALERT
BURST
EOT
DID
DID
Free Buffer Enquiries
A Free Buffer Enquiry is used to ask another node
if it is able to accept a packet of data. It is sent by
the following sequence:
# An ALERT BURST
# An ENQ (ENQuiry: ASCII code 85H)
#
Two
(repeated)
DID
(Destination
ID)
characters
ALERT
BURST
ENQ
DID
DID
Data Packets
A Data Packet consists of the actual data being
sent to another node. It is sent by the following
sequence:
#$
An ALERT BURST
#$
An SOH (Start Of Header--ASCII code 01H)
#$
An SID (Source ID) character
#$
Two
(repeated)
DID
(Destination
ID)
characters
#$
A single COUNT character which is the 2's
complement of the number of data bytes to
follow if a short packet is sent, or 00H
followed by a COUNT character if a long
packet is sent.
#$
N data bytes where COUNT = 256-N (or 512-
N for a long packet)
#$
Two
CRC
(Cyclic
Redundancy
Check)
characters.
The CRC polynomial used is:
X
16 + X15 + X2 + 1.
ALERT
BURST
SOH
SID
DID
DID
COUNT
data
data
CRC
CRC



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