一种基于HDTV信源集成解码芯片的RTOS的设计与实现

随着系统集成芯片（SOC）设计复杂度和上市时间等要求的提高，实时操作系统已成为SOC设计中的重要组成部分。HDTV信源集成解码芯片中的实时操作系统负责对进出芯片的数据进行管理，芯片上实现多个实时任务的同步和调度。本文介绍一个以较小内核实现的多任务实时操作系统Iota，它将总线的调度部分的转移到硬件实现，并针对解码芯片设计并实现了多任务混合调度算法。为提高系统的健壮性，Iota还具有一个简单的存储保护策略。

Design and Implementation of RTOS for a HDTV Integrated Source Decoding Chip

Because of the complexity and Time-To-Market challenge in system-on-chip (SOC) design, the real-time operating system (RTOS) has become indispensable in SOC. In the HDTV integrated source-decoding chip, the RTOS, named Iota, is designed for the management of memory units, I/O devices and the scheduling and synchronization of multitasks. In this article, the design principle of a multi-task real-time operating system with small-memory footprint is proposed. The I/O management of Iota is implemented in hardware components and a hybrid scheduling mechanism is adopted for the tasks in the decoding chip. Furthermore, a simple memory protection mechanism is realized to improve the robustness of the system.