PEB 2091
PEF 2091
Preface
The ISDN Echocancellation Circuit for the 2B1Q line code (IEC-Q) is a U-interface
transceiver for level 1 basic access subscriber lines covering a wide range of
applications related to this function.
This data sheet describes the properties of the IEC-Q needed for understanding its
external connections, architecture and functions, and for designing circuits using this
device.
Organization of this Document
This document follows a top-down approach in describing the IEC-Q and its features. It
is application oriented, designed to maximize customers’ effectivity in designing and
debugging their boards. Numerous examples of programming code and application hints
are included. An index is included. It consists of 11 chapters and an appendix.
• Chapter 1, Overview
Describes the system related view of the device, i.e. features, system integration and
typical applications.
• Chapter 2, Pin Descriptions
Gives a detailed description of the device pins, their functions and their physical
location for the different packages available.
• Chapter 3, Functional Description
Provides a high level block diagram of the IEC-Q, describes setting its operational
modes and gives an overview of the device architecture. All user’s interfaces are
described in detail. Interaction between these interfaces, however, is not in the scope
of this chapter.
• Chapter 4, Operational Description
Describes access means to the IEC-Q features and the resulting device behavior in
all relevant operational modes. Interaction between the different interfaces is
described.
• Chapter 5, Register Description
Provides a detailed description of the registers used in the microprocessor mode.
• Chapter 6, Programming
Gives an overview of important programming codes and provides numerous practical
programming examples.
Semiconductor Group
16
Data Sheet 01.99
INFINEON [ Infineon ]
