1.0 Product Description
CX28394/28395/28398
1.1 Overview
Quad/x16/Octal—T1/E1/J1 Framers
1.1.3 LIU Serial Port
The CX28394 and CX28398 devices include a serial interface which allows a
microprocessor to indirectly communicate with a line interface unit such as the
CX28380 Quad T1/E1 LIU. This interface allows the microprocessor to control
and query the LIU status. This serial interface is not available on the CX28395.
1.1.4 Transmit/Receive Line Interface
The CX28394 and CX28398 devices include line interfaces which can operate in
either of two modes: bipolar NRZ or unipolar NRZ. In bipolar NRZ mode,
receiver signals RPOSI, RNEGI, and RCKI are used; and transmitter signals
TPOSO, TNEGO, and TCKO are used. In unipolar NRZ mode, receiver signals
RNRZ and RCKI are used, and transmitter signals TNRZO and TCKO are used.
The CX28395 device provides only unipolar NRZ operation and signals.
Figure 1-1 illustrates the CX28395 Functional Block Diagram (single framer).
Figure 1-1. CX28395 Functional Block Diagram
Receive NRZ Data
RX
Slip
Buffer
Receive
System
Bus
T1/E1
Receive
Framer
Receive NRZ Clock
Transmit
System
Bus
TX
Slip
Transmit NRZ Data
Transmit NRZ Clock
Buffer
T1/E1
Overhead
Insertion
Transmit
Framer
Data Link Controllers
DL1 + DL2
1-2
Conexant
100054E
CONEXANT [ CONEXANT SYSTEMS, INC ]
