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 required
In 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. |
||||
|
|
Sunday, February 26, 2012
Difference between MAX and MIN mode
Subscribe to:
Post Comments (Atom)
third point is wrong......
ReplyDeletethere is single processor in mim mode....
while multiple processor in max mode...
Thank you Diya for pointing out the errors. So i have updated the post with correct points an some more points. Thank you again.
Deletemicroprocessor padha do naaaa....divya
Deletethanks, it is some useful information
ReplyDeleteyou are welcome... keep visiting....
DeleteAren't ALE,DEN,DTR found in min mode?
ReplyDeleteThis point is confusing:
This bus controller produces MEMRDC, MEMWRC, IORDC, IOWRC, ALE, DEN, DT/R control signals.
why is there bar over certain pins in 8086? What does tat indicate? please help
ReplyDeleteBar indicates active low signals.
DeleteThese signals will be 'ON' on input 0 bit and 'OFF' on input 1bit.
Bar indicates active low signals.
DeleteThese signals will be 'ON' on input 0 bit and 'OFF' on input 1bit.
Thank you Akansha. Do that mean MX (bar) indicates MAX mode is applicable only when the input bit is 0? If so, what will happen at pin 26 or pin 29 when the input is 1?
DeleteFor some signals to get output without any delay we try to give ACTIVE LOW signals.So,if you find any BAR on any pin of mp/mc then it means tgat it is ACTIVE LOW...
DeleteFor some signals to get output without any delay we try to give ACTIVE LOW signals.So,if you find any BAR on any pin of mp/mc then it means tgat it is ACTIVE LOW...
DeleteThe diag is taken from which text book
ReplyDeleteAdvanced Microprocessors and Peripherals by AK Ray and KM Bhurchandi.
DeleteIt is noted that in minimum mode, the processor cannot be accessed by other master. So what is the importance of HOLD and HLDA pin in 8086 minimum mode configuration?
ReplyDeletewhere memory read is use?. minimum or maximum mode??
ReplyDeleteCan anyone please tell me what is the purpose of using minimum and maximum mode? Where it is used?
ReplyDelete