參數(shù)資料
型號(hào)： 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(yè)數(shù)： 40/51頁(yè)
文件大小： 271K
代理商： AM79C864AKCW
AMD
P R E L I M I N A R Y
3-42
The SUPERNET 2 Family for FDDI 1994 Data Book
Using the Stream Cipher Scrambler
The system has access to the scrambler and
descrambler through a pin and a register. Pin 41
(SCRM)
and
bit
0
PLC_CNTRL_C enable the scrambler. SCRM and
(CIPHER_ENABLE)
of
Table 18. Stream Cipher Enable
SCRM
Cipher Enable
Scrambler
LOW
LOW
Disabled
LOW
HIGH
Enabled
HIGH
LOW
Enabled
HIGH
HIGH
Enabled
CIPHER_ENABLE are ORed together so either one
HIGH overrides the other (Table 18). Pin 41 is a ground
pin on previous versions of the PLC; therefore if the
PLC-S is to be used in the fiber mode, it can be inserted
in a previously manufactured board without any
changes.
11
10
9
8
7
6
5
4
3
2
1
S_Data
15535B-16
Data
Figure 4. Stream Cipher Scrambler
5
5
5
5
5
5
5
5
+
–
+
–
SCRM_RSYNC
S_Data
Data/D_Data
State
Synchronizer
Capture
Deduced
Line State
Random
Generator
15535B-17
Figure 5. Stream Cipher Descrambler
Repeat Filter
The main function of the Repeat Filter is to prevent the
propagation of code violations and invalid line states
from the inbound link to the outbound link. This function
is not required if a MAC layer is present in the station
configuration (since MAC will not propagate invalid line
states and code violations). But certain station configu-
rations consist of only PHY layer entities (such as the
path of the secondary ring inside a station with just one
MAC in the primary ring). In such cases, a PHY layer
implementation is expected to provide the Repeat Filter
function.
The Repeat Filter in the PLC-S filters the symbol stream
at the output of the Remote Loopback MUX. Invalid line
states are not allowed to propagate through a station;
they will be turned into an Idle symbol stream. Also, if the
repeat filter detects a corrupted frame, it truncates the
frame by transmitting four Halt symbols and then Idle
symbols until a JK symbol pair is seen. The Halt symbols
will cause the next MAC entity in the logical ring to count
the frame as a lost frame.
Another function of the Repeat Filter is called the
GOBBLE_BYTE function. When the Repeat Filter
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