cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 20

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

1.0 Product Description
1.1 Overview
1.1.3 LIU Serial Port
1.1.4 Transmit/Receive Line Interface
1-2
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.
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
Figure 1-1. CX28395 Functional Block Diagram
illustrates the CX28395 Functional Block Diagram (single framer).
Receive NRZ Data
Receive NRZ Clock
Transmit NRZ Data
Transmit NRZ Clock
Conexant
Overhead
Data Link Controllers
Insertion
Receive
Framer
T1/E1
DL1 + DL2
Transmit
Framer
T1/E1
Quad/x16/Octal—T1/E1/J1 Framers
Buffer
Buffer
Slip
Slip
RX
TX
CX28394/28395/28398
Transmit
Receive
System
System
Bus
Bus
100054E