TI 公司的ECG解決方案是采用TMS320VC5505 定點DSP,它是基于TMS320C55x DSP CPU核的定點DSP,它的C55x? DSP架構(gòu)可得到高性能和低功耗特性,CPU支持內(nèi)部總線架構(gòu),包括一條可編程總線,一條321位數(shù)據(jù)總總線和兩條16位數(shù)據(jù)讀總線,兩條數(shù)據(jù)寫總線和專門用于外設和DMA的其它總線. TMS320VC5505還包括4個DMA控制器,每個四路.時鐘為60MHz或100MHz,指令周期為16.67ns或10ns.主要用于無線音頻設備,回聲消除耳機,手提媒體設備,視頻,工業(yè)控制,指紋生物學和SDR. 本文介紹了TMS320VC5505的主要特性和方框圖以及采用TMS320VC5505的ECG解決方案方框圖, ECG前端板詳細電路圖和所用材料清單(BOM).
Basic functions of an ECG machine include ECG waveform display, either through LCD screen or printed paper media, and heart rhythm indication as well as simple user interface through buttons. More features, such as patient record storage through convenient media, wireless/wired transfer and 2D/3D display on large LCD screen with touch screen capabilities, are required in more and more ECG products. Multiple levels of diagnostic capabilities are also assisting doctors and people without specific ECG trainings to understand ECG patterns and their indication of a certain heart condition. After the ECG signal is captured and digitized, it will be sent for display and analysis, which involves further signal processing.
圖1.TI ECG方框圖
ECG Implementation on the TMS320VC5505 DSP Medical Development Kit (Rev. A)
The TMS320VC5505 is a member of TIs TMS320C5000? fixed-point Digital Signal Processor (DSP) product family and is designed for low-power applications.
The TMS320VC5505 fixed-point DSP is based on the TMS320C55x? DSP generation CPU processor core. The C55x? DSP architecture achieves high performance and low power through increased parallelism and total focus on power savings. The CPU supports an internal bus structure that is composed of one program bus, one 32-bit data read bus and two 16-bit data read buses, two 16-bit data write buses, and additional buses dedicated to peripheral and DMA activity. These buses provide the ability to perform up to four 16-bit data reads and two 16-bit data writes in a single cycle. The TMS320VC5505 also includes four DMA controllers, each with 4 channels, providing data movements for 16-independent channel contexts without CPU intervention. Each DMA controller can perform one 32-bit data transfer per cycle, in parallel and independent of the CPU activity.
The C55x CPU provides two multiply-accumulate (MAC) units, each capable of 17-bit x 17-bit multiplication and a 32-bit add in a single cycle. A central 40-bit arithmetic/logic unit (ALU) is supported by an additional 16-bit ALU. Use of the ALUs is under instruction set control, providing the ability to optimize parallel activity and power consumption. These resources are managed in the Address Unit (AU) and Data Unit (DU) of the C55x CPU.
The C55x CPU supports a variable byte width instruction set for improved code density. The Instruction Unit (IU) performs 32-bit program fetches from internal or external memory and queues instructions for the Program Unit (PU). The Program Unit decodes the instructions, directs tasks to the Address Unit (AU) and Data Unit (DU) resources, and manages the fully protected pipeline. Predictive branching capability avoids pipeline flushes on execution of conditional instructions.
The general-purpose input and output functions along with the 10-bit SAR ADC provide sufficient pins for status, interrupts, and bit I/O for LCD displays, keyboards, and media interfaces. Serial media is supported through two MultiMedia Card/Secure Digital (MMC/SD) peripherals, four Inter-IC Sound (I2S Bus?) modules, one Serial-Port Interface (SPI) with up to 4 chip selects, one I2C multi-master and slave interface, and a Universal Asynchronous Receiver/Transmitter (UART) interface.
The VC5505 peripheral set includes an external memory interface (EMIF) that provides glueless access to asynchronous memories like EPROM, NOR, NAND, and SRAM. Additional peripherals include: a high-speed Universal Serial Bus (USB2.0) device mode only, and a real-time clock (RTC). The DMA controller provides data movement for sixteen independent channel contexts without CPU intervention, providing DMA throughput of up to two 16-bit words per cycle. This device also includesthree general-purpose timers with one configurable as a watchdog timer, and a analog phase-locked loop (APLL) clock generator.
In addition, the VC5505 includes a tightly-coupled FFT Hardware Accelerator. The tightly-coupled FFT Hardware Accelerator supports 8 to 1024-point (in power of 2) real and complex-valued FFTs.
TMS320VC5505主要特性:
High-Performance, Low-Power, TMS320C55x? Fixed-Point Digital Signal Processor
16.67-, 10-ns Instruction Cycle Time 60-, 100-MHz Clock Rate
