cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 62

• Manufacturer Part Number: cx28394
• Description: Quad/x16/octal-t1/e1/j1 Framers
• Manufacturer: Conexant Systems, Inc.

2.0 Circuit Description
2.2 Receiver
Figure 2-3. RCVR Diagram
2.2.1 ZCS Decoder
2-4
RPOSI
RNEGI
RNRZI
Loopback
Line
Decoder
RZCS
Loopback
2.2 Receiver
The Receiver (RCVR) inputs single rail NRZ data or decodes positive and
negative rail NRZ data into single rail NRZ data. The RCVR, illustrated in
Figure
(RZCS) Decoder, In-Band Loopback Code Detector, Error Counters, Error
Monitor, Alarm Monitor, Test Pattern Receiver, Receive Framer, External
Receive Data Link, and Receive Data Links.
The Receive Zero Code Suppression (RZCS) decoder is applicable only to the
CX28394 and CX28398. The decoder decodes the dual rail data (bipolar) into
single rail data (unipolar). The Receive AMI bit (RAMI) in the Receiver
Configuration register [RCR0; addr 040] controls whether the received signal is
B8ZS/HDB3 decoded, depending on T1/E1N [addr 001] line rate selection, or if
the RZCS decoder is bypassed. If the line code is unknown, the ZCSUB bit in
Receive Line Code Status [RSTAT; addr 021] indicates the RPOSI/RNEGI input
received one or more B8ZS/HDB3 substitution patterns. If the line code is
B8ZS/HDB3-encoded, the RZCS bit in RCR0 should be set to keep the LCV
counter from counting BPVs that are part of the B8ZS/HDB3 code.
Framer
2-3, consists of the following elements: Receive Zero Code Suppression
Receiver Timebase
PRBS/Inband LB
Receive Framer
External DLINK
Error Counters
RPDV Monitor
Alarm Monitor
Error Monitor
Sa-Byte
RCKI
Conexant
To RSB
MOP/BOP
DLINK1
Quad/x16/Octal—T1/E1/J1 Framers
Registers
MPU
CX28394/28395/28398
DLINK2
MOP
RNRZ
100054E