Respected Experts, In the given figure assume one box as Intel 386EX embedded processor and the other one as external device(eg: memory).
Intel 386EX processor External decice(eg:memory) .------------. .-------------. . . . . . W/r#. . . . . . . . rd# .------------ .rd# . . wr# .------------ .wr# . . . . . .------------. .-------------. The rd# of processor is connected to rd# of external device. The wr# of processor is connected to wr# of external device.
Intel has provided 3 pins on chip .i.e. w/r#, rd#, wr# for controlling of read and write cycle.
1) what is the purpose of providing 2 sets of control signals.i.e. w/r# and rd#, wr#.2) Is there any significance of w/r#.
3) Which is the better way of connecting 386EX to external device.4) who controls these 3 pins. Is it possible to control these pins by the user.
5) what happens if w/r# is left floating. 6) We suspect some timing problem in read and write cycle, so is it necessary to make rd# and wr# as a function of w/r# to avoid timing problems.With regards Ravi Kumar.N