參數(shù)資料
型號(hào)： DM9008F
廠商： Electronic Theatre Controls, Inc.
英文描述： ISA/Plug & Play Super Ethernet Contoller
中文描述： 的ISA /插頭
文件頁(yè)數(shù)： 39/68頁(yè)
文件大?。?/td> 403K
代理商： DM9008F
DM9008
ISA/Plug & Play Super Ethernet Contoller
any filters. Physical, broadcast, multicast, and promis-cuous
address modes can be selected.
Final
Version :DM9008-DS-F02
June 14, 2000
39
Preamble and Start of Frame
Delimiter (SFD)
The Manchester encoded alternating 1, 0 preamble field is
used by the ENA to acquire bit synchronization with an
incoming packet. When transmitted, each packet contains 62
bits of alternating 1, 0 preamble. Some of this preamble will be
lost as the packet travels through the network. The preamble
field is stripped by the ENC. Byte alignment is performed with
the Start of Frame Delimiter (SFD) pattern, which consists of
two consecutive 1's. The ENC does not treat the SFD pattern
as a byte; it detects only the two-bit pattern. This allows any
preceding preamble within the SFD to be used for phase
locking.
Destination Address
The destination address indicates the destination of the packet
on the network, and is used to filter unwanted packets from
reaching a node. Three types of address formats are
supported by the DM9008: physical, multicast and broadcast.
The physical address is a unique address that corresponds to
only a single node. All physical addresses have an MSB of "0."
These addresses are compared to the internally stored
physical address registers. Each bit in the destination address
must match the corresponding address of the address register
in order for DM9008 to accept the packet. Multicast addresses
begin with an MSB of "1." The DM9008 filters multicast
addresses using a standard hashing algorithm that maps all
multicast addresses into a 6-bit value. This 6-bit value indexes
a 64-bit array that filters the value. If the address consists of all
1's, it is a broadcast address, indicating that the packet is
intende for all nodes. Promiscuous mode allows reception of
all packets: the destination address is not required to match
Source Address
The source address is the physical address of the node that
sent the packet. Source addresses cannot be multicast or
broadcast addresses. This field is simply passed to buffer
memory.
Length Field
The 2-byte length field indicates the number of bytes that are
contained in the data field of the packet. This field is not
interpreted by the ENC.
Data Field
The data field consists of anywhere from 46 to 1500 bytes.
Messages longer than 1500 bytes need to be broken into
multiple packets. Messages shorter than 46 bytes will require
padding to bring the data field to the minimum length of 46
bytes. If the data field is padded, the number of valid data bytes
is indicated in the length.
FCS Field
The Frame Check Sequence (FCS) is a 32-bit CRC field
calculated and appended to a packet during transmission to
allow detection of errors when a packet is received. During
reception, error-free packets result in a specific pattern in the
CRC generator. Packets with improper CRC will be rejected.
The AUTODIN II ( X
32
+ X
26
+ X
23
+ X
22
+ X
16
+ X
12
+ X
11
+ X
10
+
X
8
+ X
7
+ X
5
+ X
4
+ X
2
+ X
1
+ 1) polynomial is used for CRC
calculations.
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