Research And Application On Data Transmission Technology Of USB

USB, a new type Universe Serial Bus, which has very high transfer rate, plug and play and compatibility virtue, and has been widely applied data transmission and image acquisition. The dynamic memory test instrument developed by the laboratory mainly adopted outdated interface to communicate in the past. The interface has lower data transfer rate,which cannot meet the requirements of data transfer of high capability memory test instrument. So,I decide to research data transmission of USB.The actual work Based the project as follows:First, to the memory test system, it not only changes data with peripheral equipment,but also does the simple control .Based on the characteristics, it synthetizes and compares a variety of USB chips, EZ-USB FX2 chip Cy7c68013 of Cypress corporation is applied to realize the high speed download. It introduces USB bus technology and characteristic.Second, USB interface circuit is designed to solve high capability memory test system..It adopts the high rate General Programmable Interface (GPIF) because the FLASH has 1G memory capability, carrys on the design of hardware round the GPIF and peripheral equipments,and programm the firmware. Sequential control logic of peripheral equipments is mainly discussed. In addition,it investigates the design of general drive program and computer application program. Also, the dynamic link base is written combined the application which owns a stable performance and can be used in various systems. Through eventual test, it can upload the 1G data to computer and display in short time, and the result is accurate.Third, the article introduces the real-time data collecting display system based on USB interface.It does relevant introductory about choose of transducer, collecting of Signal, magnifying, filtering, A/D transforming,USB Communication and computer displaying. It carrys out real measurement to writer's pulse,and conforms to standard of human pulse.