am79c864a Advanced Micro Devices, am79c864a Datasheet - Page 2

• Manufacturer Part Number: am79c864a
• Description: Physical Layer Controller With Scrambler Plc-s
• Manufacturer: Advanced Micro Devices

PLC-S chip during Link Confidence Test and after the
link has been formed, to detect a noisy link. The PLC-S
contains a Line State Machine for detecting received
line states and a Data Stream Generator for transmitting
the various line states. The PLC-S also contains a state
machine called Physical Connection Insertion (PCI)
which is used in Physical Connection insertion and re-
moval. It performs the necessary ring scrubbing and
data path switching.
PLC-S BLOCK DIAGRAM
3-4
See next page for the PLC-S Core block diagram
NPADDR 4-0
AMD
NP 15-0
RXPAR
TXPAR
RX 9–0
TX 9–0
SCRM
The SUPERNET 2 Family for FDDI 1994 Data Book
PLC-S
Core
P R E L I M I N A R Y
IRDAT
ITDAT
The Node Processor Interface in the PLC-S consists of
several control and status registers. The PLC-S also
contains error and special event counters, Built In Self
Test (BIST) logic, Boundary Scan logic, and several
data loopback multiplexers so that internal data paths
may be reconfigured for test purposes.
Signal_Detect Control
FOTOFF Control
Programmable
Descrambler
(Optional)
Scrambler
Stream
Cipher
Stream
Cipher
CIPHER_
LOOPBACK
MUX
15535B-1
FOTOFF
TDAT 4–0
LSCLK
RDAT 4–0
RSCLK
SDO
Signals
Control