RELATED TO ENGINEERING

1. UNIT II
8086 SYSTEM BUS STRUCTURE

2. MAXIMUM MODE
Maximum mode
 Maximum mode is designed to be used with a coprocessor exists
in the system.
 All the control signals (except RD) are not generated by the
microprocessor.
 But we still need those control signals.
 Solution:
 8288.
A.Azhagu Jaisudhan M.E. (Ph.D)

3. 8086 maximum & minimum modes
 8086 maximum & minimum modes
 The mode is controlled by MN/MX.
 Maximum mode is obtained by connecting MN/MX to low and
minimum mode is by connecting it to high.
 Having two different modes (minimum and maximum) is used only
8088/8086.
 Each mode enables a different control structure.
 Minimum mode operation and control signals are very similar to
those of 8085.
 So 8085 8-bit peripherals can be used with 8086 without special
considerations.
 Easy and least expensive way to build single processor systems
A.Azhagu Jaisudhan M.E. (Ph.D)

4. Pin Diagram of 8086
A.Azhagu Jaisudhan M.E. (Ph.D)

5. SYSTEM BUS STRUCTURE OF PC
A.Azhagu Jaisudhan M.E. (Ph.D)

6. A.Azhagu Jaisudhan M.E. (Ph.D)
Minimum mode configuration 8086

7. A.Azhagu Jaisudhan M.E. (Ph.D)

8. Minimum-mode Memory-Read bus-cycle
A.Azhagu Jaisudhan M.E. (Ph.D)

9. Minimum-mode Memory-Write bus-cycle
A.Azhagu Jaisudhan M.E. (Ph.D)

10. Maximum-mode Memory-Read bus-cycle
A.Azhagu Jaisudhan M.E. (Ph.D)

11. Maximum-mode Memory-write bus-cycle
A.Azhagu Jaisudhan M.E. (Ph.D)