參數(shù)資料
型號(hào): AM79C864AKC
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: 0 CHANNEL(S), 100M bps, FDDI CONTROLLER, PQFP120
封裝: PLASTIC, QFP-120
文件頁數(shù): 12/51頁
文件大小: 271K
代理商: AM79C864AKC
AMD
P R E L I M I N A R Y
3-14
The SUPERNET 2 Family for FDDI 1994 Data Book
RRSCLK
Reserved (Input)
This pin should be connected to VSS.
Control and Status Signals
EBFERR
Elasticity Buffer Error (Output, Active High)
EBFERR indicates when an overflow or underflow con-
dition occurs in the Elasticity Buffer.
ENCOFF
Encoder Off (Input, Active High)
The ENCOFF signal turns off the encoding and decod-
ing function of the PLC-S. This allows for the transmis-
sion of any symbol, including invalid symbols for
diagnostic purposes.
LSR 2–0
Line State Register (Output)
The LSR 2–0 signals directly output the LINE_ST field of
the PLC_STATUS_A register to ring test and monitor
equipment.
LSR 2–0
Description
000
Noise Line State (NLS)
001
Active Line State (ALS)
010
Undefined
011
Idle Line State (ILS4 –
achieved after 4 Idle symbols)
100
Quiet Line State (QLS)
101
Master Line State (MLS)
110
Halt Line State (HLS)
111
Idle Line State (ILS16 –
achieved after 16 Idle symbols)
ULSB
Unknown Line State (Output)
The ULSB signal directly outputs the UNKN_LINE_ST
bit of the PLC_STATUS_A register to ring test and moni-
tor equipment.
SCRM
Scrambler Enable (Input)
This pin when held high will enable the Stream Cipher
Scrambling/Descrambling function. If this pin is held
low, then bit 0 of PLC_CNTRL_C Register determines if
Stream Cipher Scrambling/Descrambling function is
enabled.
Power and Ground
V
DD
Power (Inputs)
The V
DD
pins supply +5 V to the device.
V
SS
Ground (Input)
The V
SS
pins ground the device.
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