本科论文设计-基于FPGA的键盘译码电路设计与实现.doc

PAGE \* MERGEFORMAT III基于FPGA的键盘译码电路设计与实现摘 要随着计算机产业的发展，作为计算机最普遍的输入设备的键盘时刻发生着变化。1981年IBM推出了IBM PC/XT键盘和其接口的标准。这个标准讲键盘接口定义了83键，采用简单的串行协议和5脚DIN连接器。其实，主机到键盘的命令在最初套键盘扫描码集是不存在的。为了解决这问题，IBM在1984年推出了IBM AT键盘接口的标准。这个标准将键盘接口定义了84～101键，采取5脚DIN连接器与双向串行通讯协议，根据第二套键盘扫描码集这个协议设定了8个主机至键盘的操作命令。，IBM于1987年再次推出了PS/2键盘的接口标准。该标准依然定义了84～101键，但是采用6脚mini-DIN连接器，这个连接器在封装上更加小巧，依然采用双向串行通讯协议而且提供有可选择性的第三套键盘扫描码集，同时支持17个主机至键盘的操作命令。如今，市场上的键盘都与PS/2及AT键盘兼容，仅是功能不相同而已。关键词：PS/2接口，键盘译码，接口协议，FPGA大连东软信息学院毕业设计（论文） AbstractFPGA-based Design and Implementation of Keyboard Decoding CircuitAbstractWith the development of the computer industry, as the most common computer input devices keyboard and with each passing day. In 1981, IBM introduced the IBM PC/XT Keyboard and interface standards. This standard defines the 83-key, using 5-pin DIN connector and the simple serial Protocol. In fact, the first set of keyboard scan code set is not host to keyboard commands. In 1984, IBM introduced the IBM AT keyboard interface standard. This standard defines the 84~101 key, using 5-pin DIN connector and bi-directional serial communications protocol, this Protocol in accordance with the second set of keyboard scan code set includes 8 host to keyboard commands. By the year 1987, IBM has introduced PS/keyboard interface standard. This standard defines a 84~101 key, but with 6 pin mini-DIN connector, the connector is in a more compact package, still with a bidirectional serial communication protocol and provides the option of a third set of keyboard scan code set, while supporting 17 host to keyboard commands. Now, the keyboard on the market are compatible and PS/2 and AT the keyboard, but the functionality is different.Key words: PS/2 interface, keyboard coding, interface protocol, FPGA大连东软信息学院毕业设计（论文） 目录目　录 TOC \o 1-3 \u 摘 要 PAGEREF _Toc386397417 \h IAbstract PAGEREF _Toc386397418 \h II第1章　绪 论 PAGEREF _Toc386397419 \h 11.1