AM79C864AKCW AMD [Advanced Micro Devices], AM79C864AKCW Datasheet - Page 32

• Manufacturer Part Number: AM79C864AKCW
• Description: Physical Layer Controller With Scrambler (PLC-S)
• Manufacturer: AMD [Advanced Micro Devices]

The FDDI SMT ANSI Standard defines the following
types of physical attachment:
A. Dual ring PHY entity connected to Primary Ring In,
B. Dual ring PHY entity connected to Secondary Ring
M. Concentrator PHY entity type “Master” to provide
S. Single attachment PHY entity type “Slave”,
Figure 2 illustrates different connection types.
3-34
Secondary Ring Out
In, Primary Ring Out
connection within the concentrator tree
intended to be attached to a PHY of type M within
a concentrator tree.
AMD
Full Duplex
Connection
M
S
S
S
A
SAS
SAS
SAS
Concentrator
End Stations
DAC
M
The SUPERNET 2 Family for FDDI 1994 Data Book
Figure 2. Illustrations of Connection Types
S
B
M
M-S
Connection
P R E L I M I N A R Y
SAS
M
Secondary Ring
Secondary Ring
Primary Ring
Primary Ring
Concentrator
SAC
M
Connection
S
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.
End Stations
SAS
M-S
A
M
M
S
S
SAS
Concentrator
DAC
M
Connection
S
End Stations
15535B-14
SAS
A-B
B
M
S
SAS