PDIUSBD12带并行总线的USB接口器件

PDIUSBD12带并行总线的USB接口器件(中文4100字,英文2500字)
PDIUSBD12是一款性价比很高的USB器件，它通常用作微控制器系统中实现与微控制器进行通信的高速通用并行接口，它还支持本地的DMA传输。这种实现USB接口的标准组件使得设计者可以在各种不同类型微控制器中选择出最合适的微控制器。这种灵活性减小了开发的时间，风险以及费用（通过使用已有的结构和减少固件上的投资），从而用最快捷的方法实现最经济的USB外设的解决方案。PDIUSBD12完全符合USB1.1版的规范，它还符合大多数器件的分类规格，成像类海量存储器件，通信器件，打印设备以及人机接口设备。同样地，PDIUSBD12理想地适用于许多外设。例如，打印机，扫描仪，外部的存储设备（Zip驱动器）和数码相机等等。它使得当前使用SCSI的系统可以立即降低成本。PDIUSBD12所具有的低挂起功耗连同LazyClock输出可以满足使用ACPI，OnNOW和USB电源管理的要求，低的操作功耗可以应用于使用总线供电的外设。此外它还集成了许多特性，包括SoftConnetTM，GoodLinkTM，可编程时钟输出，低频晶振和终止寄存器集合。所有这些特性都为系统显著节约了成本，同时使USB功能在外设上的应用变得容易。

PDIUSBD12----USB interface device with parallel bus   

The PDIUSBD12 is a cost and feature optimized USB device. It is normally used in microcontroller based systems and communicates with the system microcontroller over the high-speed general purpose parallel interface. It also supports local DMA transfer.This modular approach to implementing a USB interface allows the designer to choose the optimum system microcontroller from the available wide variety. This flexibility cuts down the development time, risks, and costs by allowing the use of the existing architecture and minimize firmware investments.This results in the fastest way to develop the most cost effective USB peripheral solution.The PDIUSBD12 fully conforms to the USB specification Rev. 2.0 (basic speed). It is also designed to be compliant with most device class specifications: Imaging Class, Mass Storage Devices, Communication Devices, Printing Devices, and Human Interface Devices.Assuch, the PDIUSBD 12 is ideally suited for many peripherals like Printer, Scanner, External Mass Storage (Zip Drive), Digital Still Camera, etc. It offers an immediate cost reduction for applications that currently use SCSI implementations.The PDIUSBD12 low suspend power consumption along with the Lazy Clock output allowsfor easy implementation of equipment that is compliant to the ACPI(TM),OnNOW(TM), and USB power management requirements. [来源：http://www.doc163.com]