本章介绍8087数字数据处理器(NDP)。图4.1a 是其外引线功能分配和内部结构,图4.1b 表示与8086/8088CPU 的连接。第二章曾介绍了8087在8086 16位机系统及80888位机系统中的连接框图。8087NDP 扩充了8086/8088指令系统,提供了重要的“数据捣弄”能力。它作为与8086/8088连接的协处理器,相当于在8086/8088寄存器组中增加了8个80位浮点寄存器。它利用本身的指令队列来监控8086/8088的 This chapter describes the 8087 Digital Data Processor (NDP). Figure 4.1a shows the functional assignment of its outer leads and its internal structure. Figure 4.1b shows the connection to the 8086 / 8088CPU. Chapter 2 introduced the 8087’s 8086 16-bit system and the 80888-bit system block diagram. The 8087NDP has expanded the 8086/8088 command system to provide an important “data mashup” capability. It acts as a coprocessor connected to the 8086/8088, which is equivalent to adding eight 80-bit floating-point registers to the 8086/8088 register bank. It uses its own command queue to monitor the 8086/8088