TLDD10077

December 1991

ISDN Basic Rate Interface Software for the HPC16400E

High Performance Data Communications Microcontroller

General Description

The ISDN Basic Rate Interface Software Package imple-

troller Family contains the software elements that are nec-

essary to implement CCITT standards Q921 and Q931 as

approved by ANSI committees for North America

The software package is designed to be easily unbundled

and used independently by a software developer Each lay-

er or function is written as a separate software task This

modular design and well defined task interface make it easy

to interface application dependent software to the modules

provided The coding standards for software development

have been designed to ensure development of consistent

structured code which can be easily used and maintained

over the life of the code

This software is supplied as a disk set and is used in con-

junction with HPC development tools and software

Features

Y

Multi-tasking executive

Y

Preemptive scheduling

Y

Modular software design

Y

Multiple timer facility

Y

HPC physical layer IO interface

Y

Layer 2 link access procedure for the D channel

(LAPD)

Y

Layer 2 link access procedure for the B channel

(LAPB)

Y

Layer 3 protocol control procedure for a terminal

endpoint

Y

Layer management entity support

Y

Demonstration Call Control Task

Y

Task

View task exerciser and debugger

Y

Message trace capability

Y

Split frame message formatting

Y

Source code in C language

Block Diagram

HPC ISDN Software

TLDD10077 – 1

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A