Design And Implementation Of High Speed Data Interface Card Applied In CTP Based On USB2.0 Technology

Data Interface Card, a special printing equipment for data processing and sending is applied in prepress equipments (PC, etc.) and output devices (Laser Imagesetter / Computer-to-Plate which is abbreviated as CTP). Up to 2009, PCI Data Interface Card has been the mainstream data interface card, but PCI Data Interface Card is easy to cause issues such as PCI slot insufficient, requires the host motherboard support, needs to disassemble the mainframes box when replace the data interface card and so on , more importantly, the data interface card technology is a commercial secret, its technical details are not disclosed, many CTP companies need to customize specific data interface card for their CTP products. In recent years, USB technology has become more and more sophisticated, the USB Data Interface Card which takes the advantages of Plug and Play, convenient interface, high speed transmission and so on, is favored by general CTP vendors. But it appears on the market quite late and the development is difficulty, so now it is mainly applied in some mainstream CTP vendors. In view of these factors, this subject is entrusted by an electrical and mechanical company in SuZhou, to design a USB2.0 high-speed and stable data interface card to supply Atlas 9000 CTP series which can be compatible with other Imagesetter/CTP through the general interface.This paper analyzes thoroughly the implementation details of the USB Data Interface Card, proposes and adopts the design proposal which unify the independent USB2.0 chip and high speed FPGA simultaneously expands a large capacity memory chip SDRAM outside according to the technical requirements related to the usb data interface card, focuses on solving the issues of high-speed transmission, communication stability, system security and etc.This paper is composed of embedded hardware and software design. The hardware includes chip selection, schematic design, PCB layout, plate made, welding, hardware debug and test and so on.The hardware board not only completes the tasks of USB2.0 high-speed, stable data transmission and a large capacity data buffer, but also provides a 50-pin interface easily interfaced with the output device. Meanwhile, it utilizes many anti-jamming hardware design such as crystal/power circuit interference and signal interference and so on to ensure the stability of the system signal. The software design includes the coding and testing of the USB-related software programs(drivers, firmware, host application, etc.) and FPGA-related programs (universal SCI controller, SDRAM controller, etc.). This software and hardware design, fully considered its generability and extendibility , adhering to the embedded component thinking, not only gives a clear design philosophy, moreover gives the component implementation method of each module. In addition, in the security design, the author develop an intelligent USB encryption dog which has the independent intellectual property rights, and therefore solve the security problem during the software using. The design and implementation of the USB2.0 High Speed Data Interface Card successfully meets the speed, stability, reliability as well as security of the manufacturer's requirements. It is running well now and is recognized by the manufacturer.