Microprocessors and Microcomputer-Based System Design, 2nd Edition

3.7    System Design Using the 8086

This section covers the basic concepts associated with interfacing the 8086 to its support chips such as memory and I/O. Topics such as timing diagrams and 8086 pins and signals will also be included.

3.7.1 Pins and Signals

The 8086 pins and signals are shown in Figure 3.6. Unless otherwise indicated, all 8086 pins are TTL compatible. As mentioned before, the 8086 can operate in two modes. These are minimum mode (uniprocessor system — single 8086) and maximum mode (multiprocessor system — more than one 8086). MN/$\overline{\text{MX}}$ is an input pin used to select one of these modes. When MN/$\overline{\text{MX}}$ is HIGH, the 8086 operates in the minimum mode. In this mode, the 8086 is configured (that is, pins are defined) to support small, ...