CN8223 Datasheet, PDF (15/161 Pages) Conexant Systems, Inc – ATM Transmitter/Receiver with UTOPIA Interface

CN8223
ATM Transmitter/Receiver with UTOPIA Interface
1.0 Product Description
1.3 Line Framing Functions
1.3 Line Framing Functions
The CN8223 provides framers for DS3, E3 (both G.751 and G.832), E4 (G.832),
STS-1, and STS-3c/STM-1 formatted serial streams. The line receive circuitry
recovers the frame location from the serial stream and provides cell octets to the
physical layer block for cell delineation. The transmit circuitry receives cell octets
from the cell generation or physical layer blocks and adds line framing overhead
information as required. The LIU receive interface detects both Loss-of-Signal
(LOS) and Line Code Violations (LCVs). The active edge of the transmit output
clock is selectable. Figure 1-2 illustrates the line framer functions of the CN8223.
Figure 1-2. Line Framer Diagram
TMRKR
TOVH_CLK TXOVH
8
TCLKO_HS±
TXOUT_HS±
TXCKI_HS±
RXCKI_HS±
RXIN_HS±
TCLKO
TXOUT
TXCKI
RXCKI
RXIN
RCV_HLD
LOCD
9
TXOUT[7:0]
RXIN[7:0] ⁹
Line
Interfaces
High
Speed
Medium
Speed
Tx
Tx
HDLC FEAC
Tx
Overhead
Insert
DS3, E3, E4, STS-1
STS-3c, STM-1
Transmit Framer
Parallel
Interface
DS3, E3, E4, STS-1
STS-3c, STM-1
Receive Framer
Rx
Rx
HDLC FEAC
Rx
Overhead
Extract
CN8223
Cell
Processing
8
RMRKR RXOVH
ROVH_CLK
CN8223 line framing functions include the following:
• STS-1, STS-3c, STM-1, DS3, E3, E4, TAXI
• External framer interface
• Parallel interface
• Unframed serial interface
• HDB3/B3ZS encode/decode
• Line overhead insertion/extraction
• SONET scrambling
• Error insertion
• Alarm detection/generation
100046C
Conexant
1-5