Comparison between Minimum mode and Maximum mode

Posted By on September 15, 2014


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Pin Diagram of 8086
Programmamer`s model of 8086

Difference between MAX and MIN mode

Maximum mode Minimum Mode
When MN/MX(bar) low 8086 is in maximum mode. When MN/MX(bar) high 8086 is in minimum mode.
In maximum mode 8086 generates QS1,QS0,S0(bar),S1(bar),S2(bar), LOCK(bar),RQ(bar)/GT1,RQ(bar)/GT0 control signals. In minimum mode 8086 generates INTA(bar), ALE, DEN(bar), DT/R(bar), M/IO(bar), HLDA,HOLD and WR(bar) control signals.
So clearly there are multiple processors in the system. There is only one processor in the system minimum mode.
Whereas in maximum mode interfacing, master/slave and multiplexing and several such control signals are requiredIn maximum mode a bus controller is required to produce control signals. This bus controller produces MEMRDC, MEMWRC, IORDC, IOWRC, ALE, DEN, DT/R control signals. In minimum mode no interfacing or master/slave signals is required.In minimum mode direct RD WR signals can be used. No bus controller required. A simple demultiplexer would do the job. of producing the control signals. This demultiplexer produces MEMRD, MEMWR, IORD, IOWR control signals.
maximum mode 8086 systemMaximum mode 8086 system
minimum mode 8086 systemMinimum mode 8086 System
Pin Diagram of 8086
Programmamer`s model of 8086

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Posted by Akash Kurup

Founder and C.E.O, World4Engineers Educationist and Entrepreneur by passion. Orator and blogger by hobby

Website: http://world4engineers.com