一种TMS320C6678辅助控制系统

An auxiliary control system for TMS320C6678

TMS320C6678是TI(Texas Instruments)推出的8核高性能DSP(Digital Signal Processor),其主频可高达1.25GHz,然而其正常工作涉及复杂的辅助控制.C6678的EVM(Evaluation Module)提供了一种以FPGA(Field Programmable Gate Array)为核心的辅助控制系统方案.考虑到FPGA硬件成本和软件开发成本高,尝试设计了一种以单片机为核心的辅助控制系统.鉴于单片机的外部中断资源有限,为实现对诸多电源状态指示信号及复位信号的监控,提出了利用逻辑门的方案.又由于单片机与DSP电气特性不匹配,提出了利用单片机OD(Open-Drain)输出特性及电平转换芯片的方案.经过测试,该辅助控制系统能够满足C6678的所有要求,并最终应用到TMS320C6678的某系统中.

TMS320C6678is a high-performance multicore DSP of Texas Instruments.This device can run at a core speed up to 1.25 GHz.In order to provide certain conditions for the DSP to work properly,some auxiliary controls are needed.The EVM for C6678 has provided a solution of auxiliary controls based on FPGA,which involves high developing costs of both hardware and software.In this paper,we proposed an auxiliary control system cored by a single-chip microcontroller.Considering that the external interrupt source of a single-chip microcontroller is limited,we utilized two logic gates to monitor the power-good signals and the reset request signals.However,there is the issue of electronic characteristic matching between the microcontroller and the DSP.We took advantage of the opendrain output characteristic of the microcontroller and involved a level shifter to solve the problem.Eventually,the new auxiliary control system was successfully applied to a TMS320C6678 system.Both hardware and software design of the new auxiliary control system were described detailedly.