cn8223 Mindspeed Technologies, cn8223 Datasheet - Page 15

• Manufacturer Part Number: cn8223
• Description: Atm Transmitter/receiver With Utopia Interface
• Manufacturer: Mindspeed Technologies

CN8223
ATM Transmitter/Receiver with UTOPIA Interface
Figure 1-2. Line Framer Diagram
100046D
TXOUT_HS
TCLKO_HS
RXCKI_HS
TXCKI_HS
TXOUT[7:0]
RXIN_HS
RCV_HLD
RXIN[7:0]
TXOUT
TCLKO
RXCKI
TXCKI
LOCD
RXIN
±
±
±
±
±
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.
9
9
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
Interfaces
Interface
Medium
Parallel
Speed
Speed
High
Line
Figure 1-2
Conexant
HDLC
HDLC
DS3, E3, E4, STS-1
DS3, E3, E4, STS-1
Rx
Tx
Receive Framer
STS-3c, STM-1
Transmit Framer
STS-3c, STM-1
illustrates the line framer functions of the CN8223.
FEAC
FEAC
Rx
Tx
ROVH_CLK
TOVH_CLK
RMRKR
TMRKR
Overhead
Overhead
Extract
Insert
Rx
Tx
RXOVH
TXOVH
8
8
CN8223
Cell
Processing
1.3 Line Framing Functions
1.0 Product Description
1-5