STD0550 ST Microelectronics, Inc., STD0550 Datasheet - Page 13

• Manufacturer Part Number: STD0550
• Description: Matrix Display Digital TV Processor
• Manufacturer: ST Microelectronics, Inc.

General Description
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Software
The layering model adopted for the Software Stack is based on certain non-functional requirements:
The application software consists of 4 main layers based on these non-functional requirements:
In this mode, the output pixel clock free-running frequency is fine-tuned, depending on the
delay between the input and output Vsync signals. The PLL filtering is performed by software.
Re-usable
Portable
Modular
Reliable and robust
Readable and maintainable
System Layer provides certain general-purpose components such as Handle or Link List
Managers. This layer also contains the Operating System Abstraction Layer (OSAL)
components which enable other layers to be OS-independent.
Driver Layer provides a hardware abstraction to the upper layers making them hardware-
independent.
Service Layer contains the components that provide the Application layer with high level
interfaces in order to manage the TV set. The set of Service components included in the
demonstration application are very useful for developing applications.
Chassis Control
Figure 6: Global Software Architecture
Graphics, Remote Control, Zapper
I²C, OSD, SDIN, Audio, Video
Application Level
STD0550
Services
Drivers
Decoders
STD0550