TMS320AV7110 datasheet(15/131 Pages) TI

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DSP

TMS320AV7110

Revision 3.1

10/08/99 22:18

Page 15

Figure 3 shows the high level block diagram of the complete software system. At the lowest level, each

hardware component has a firmware module associated with it. A module may consist of:

•

Initialization code - executed at processor reset

•

Interrupt Service Routines - executed from interrupt by the associated hardware module

The run-time support library provides an application programming interface for the user application

software. All run-time modules are written to be invoked from supervisory mode. This prevents

software running in user mode from interfering with the built-in firmware.

Functionally, the firmware consists of several software processes that are self contained at runtime and

operate for the most part, independently and asynchronously. Because of the nature of the processing of

a complex input stream, the processes are interrupt driven.

The interrupt priorities determine the processing sequence, and the de-multiplexed input stream packet

information determines the data path through the system. There is only minimal inter-process

dependency, which eliminates the need for a software control-flow process. Any inter-process

dependencies can be handled by proper structuring of the interrupt process in terms of priorities and

multi-level processing.

Firmware control

TI Run-time

Support Library

Real Time Operating Systems

Application Software

Firmware

Hardware

on chip

Figure 3. Software block diagram

TMS320AV7110 датащи(PDF) 15 Page - Texas Instruments