AM79C864AKCW AMD [Advanced Micro Devices], AM79C864AKCW Datasheet - Page 12

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

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.
3-14
AMD
LSR 2–0
000
001
010
011
100
101
110
111
Description
Noise Line State (NLS)
Active Line State (ALS)
Undefined
Idle Line State (ILS4 –
achieved after 4 Idle symbols)
Quiet Line State (QLS)
Master Line State (MLS)
Halt Line State (HLS)
Idle Line State (ILS16 –
achieved after 16 Idle symbols)
The SUPERNET 2 Family for FDDI 1994 Data Book
P R E L I M I N A R Y
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
VDD
Power (Inputs)
The VDD pins supply +5 V to the device.
VSS
Ground (Input)
The VSS pins ground the device.