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參數(shù)資料
| 型號： | AM79C864AKCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Physical Layer Controller With Scrambler (PLC-S) |
| 中文描述： | 1 CHANNEL(S), 100M bps, FDDI CONTROLLER, PQFP120 |
| 封裝： | PLASTIC, QFP-120 |
| 文件頁數(shù)： | 32/51頁 |
| 文件大?。?/td> | 271K |
| 代理商： | AM79C864AKCW |
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AMD
P R E L I M I N A R Y
3-34
The SUPERNET 2 Family for FDDI 1994 Data Book
The FDDI SMT ANSI Standard defines the following
types of physical attachment:
A. Dual ring PHY entity connected to Primary Ring In,
Secondary Ring Out
B. Dual ring PHY entity connected to Secondary Ring
In, Primary Ring Out
M. Concentrator PHY entity type “Master” to provide
connection within the concentrator tree
S. Single attachment PHY entity type “Slave”,
intended to be attached to a PHY of type M within
a concentrator tree.
Figure 2 illustrates different connection types.
CMT defines the type of physical connection between
two physical attachments. PCM consists of two entities;
the PCM State Machine and the PCM Pseudo Code.
The PLC-S chip implements the state machine, while
the pseudo code is implemented in SMT software. SMT
software decides the acceptability of connections and
communicates it to the neighboring PHY.
Secondary Ring
Primary Ring
15535B-14
B
A
M
M
M
DAC
Concentrator
B
A
M
M
M
DAC
Concentrator
S
S
S
S
S
M
M
M
SAC
Concentrator
S
S
S
S
SAS
SAS
SAS
SAS
SAS
SAS
SAS
End Stations
Full Duplex
Connection
End Stations
End Stations
Primary Ring
Secondary Ring
A-B
Connection
SAS
M-S
Connection
M-S
Connection
Figure 2. Illustrations of Connection Types
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